All GPS Lab Published Documents

This page contains a complete list of all GPS Lab published documents—conference presentations, journal articles, magazine articles, doctoral theses and books.

These documents are displayed in chronological sections, sorted by year of publication.

Within each annual section, the documents are listed alphabetically by first author.

Click on any linked title, displayed in bold blue text , either to view/download the document's PDF file or to open a publisher's website page for that document.

2025| 2024| 2023| 2022| 2021| 2020| 2019| 2018| 2017| 2016| 2015| 2014| 2013| 2012| 2011| 2010| 2009| 2008| 2007| 2006| 2005| 2004| 2003| 2002| 2001| 2000| 1999| 1998| 1997| 1996| 1995| 1994| 1993| 1992| 1991| 1990 and Earlier| 

2025

Anderson, Jason, Lo, Sherman, and Walter, Todd  
Time Synchronization of TESLA-enabled GNSS Receivers  
Published in IEEE Transactions on Aerospace and Electronic Systems ( Early Access ), 17 March 2025, DOI 10.1109/TAES.2025.3552074.

Blanch, Juan, Wang, Rebecca, and Walter, Todd
Gaussian Bounding for Multivariate Distributions with an Application to GNSS Integrity 
Published in Proceedings of the 2025 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2025.

Chen, Yu-Hsuan, Liu, Zixi, Kriezis, Argyris, Lo, Sherman, and Walter, Todd
Combining ADS-B, LCM and DPA to Detect and Locate the Interference in a Massive GNSS Jammer Test 
Published in Proceedings of the 2025 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2025.

Kriezis, Argyris, Chen, Yu-Hsuan, Akos, Dennis, Lo, Sherman, and Walter, Todd
Real-World Spoofing Detection and Characterization Using Low-Cost Receivers 
Published in Proceedings of the 2025 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2025.

Kreizis, Argyris, Chen, Yu-Hsuan, Lo, Sherman, Walter, Todd, Pullen, Sam and Akos, Dennis
How Can Measurements of Low-Cost Receivers be Used to Detect and Analyze RF Interference?
Inside GNSS March 31, 2025

Lai, Yu-Fang, Blanch, Juan, and Walter, Todd
Protecting Against Receiver Faults to a PPP Ground-Based Integrity Monitor System 
Published in Proceedings of the 2025 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2025.

Lo, Sherman, Liu, Zixi, Ibrahim, Lyla, Chen, Yu-Hsuan, and Walter, Todd
Observations of GNSS Spoofing in Russia in 2023-2024 
Published in Proceedings of the 2025 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2025.

2024

Anderson, Jason, Lo, Sherman, and Walter, Todd
Combinatorial Watermarking for GNSS Signal Authentication 
Published in Proceedings of the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.

Anderson, Jason, Lo, Sherman, and Walter, Todd
Revisiting Combinatorial Watermarking under SCER Adversarial Models 
Published in Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024.

Anderson, Jason, Lo, Sherman, and Walter, Todd  
Authentication Security of Combinatorial Watermarking for GNSS Signal Authentication  
Published in NAVIGATION, Vol. 71 No. 3, Fall 2024, DOI 10.33012/navi.655.

Anderson, Jason
Designing cryptography systems for GNSS data and ranging authentication
Ph.D. Dissertation, Stanford University, December 2024

Blanch, Juan, Oak, Sukrut, Pullen, Sam, Lo, Sherman, and Walter, Todd
Advanced RAIM for Mega-Constellations 
Published in Proceedings of the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.

Blanch, Juan, Lai, Yu_Fang, and Walter, Todd
Integrity-based estimators for Precise Point Positioning and other applications 
Published in Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024.

Blanch, Juan, Lai, Frank, Walter, Todd, and Silva, Pedro
Models for the effect of integrity monitors on GNSS user error range distributions 
Published in Proceedings of the 37th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2024), Baltimore, MD, September 2024.

Capua, Roberto, Pullen, Sam, Joerger, Mathieu, Martini, Ilaria, Neri, Alessandro, and Leahy, Edmond 
Development of RTCM SC-134 Messages for High-Integrity Precise Positioning 
Published in Proceedings of the 37th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2024), Baltimore, MD, September 2024.

Dennis, Jed, Walter, Todd, Anderson, Jason, Fernandez-Hernandez, Ignacio, Canestri, Ettore, Mabilleau, Mikael, and Châtre, Eric 
SBAS Authentication Standards 
Published in Proceedings of the 37th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2024), Baltimore, MD, September 2024.

Headlee, Lennon, Lo, Sherman, and Walter, Todd
Exploring the Utility of Doppler Shift Measurements for Enhanced GNSS Positioning 
Published in Proceedings of the 37th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2024), Baltimore, MD, September 2024.

Kriezis, Anargyros, Chen, Yu-Hsuan, Lo, Sherman, and Walter, Todd
Identifying Low Cost GNSS Monitor Metrics for Robust RFI Detection 
Published in Proceedings of the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.

Kriezis, Argyris, Chen, Yu-Hsuan, Akos, Dennis, Lo, Sherman, and Walter, Todd
GNSS RFI Detection and Impact Characterization in Various Interference Environments using Low-Cost Receivers 
Published in Proceedings of the 37th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2024), Baltimore, MD, September 2024.

Lai, Yu-Fang, Blanch, Juan, and Walter, Todd
PPP Range Error Integrity Using a Network of Ground Monitors 
Published in Proceedings of the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.

Lai, Yu-Fang, Blanch, Juan, and Walter, Todd
Ground-Based Integrity Monitors for PPP Correction Services 
Published in Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024.

Lai, Frank, Blanch, Juan and Walter, Todd
State Determination in EKF using Singular Value Decomposition for PPP Integrity Monitor System 
Published in Proceedings of the 37th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2024), Baltimore, MD, September 2024.

Liu, Zixi, Lo, Sherman, Blanch, Juan, and Walter, Todd
Identifying the Source of October 2022 Texas Jamming Incident Using ADS-B Data with an Improvement in the Model Confidence 
Published in Proceedings of the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.

Liu, Zixi, Lo, Sherman, Blanch, Juan, Chen, Yu-Hsuan, Walter, Todd, and Pullen, Sam
GNSS Spoofing and Jamming in Eastern Europe
Inside GNSS March 26, 2024

Liu, Zixi, Lo, Sherman, Blanch, Juan and Walter, Todd
GNSS Spoofing Detection and Localization Using ADS-B Data 
Published in Proceedings of the 37th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2024), Baltimore, MD, September 2024.

Liu, Zixi, Lo, Sherman, Walter, Todd, and Pullen, Sam
What has been learned recently about GNSS RF jamming and spoofing events? What tools are available online to track and investigate these events?
Inside GNSS November 26, 2024

Oak, Sukrut, Pullen, Sam, Lo, Sherman, Colobong, Isaiah, Blanch, Juan, Walter, Todd, Crews, Mark, and Jackson, Robert
LEO Satellite Augmentation of GNSS: Impact of LEO Ranging Quality on ARAIM 
Published in Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024.

Oak, Sukrut
Humanity's Journey Towards Precise Navigation
The Overview May 24, 2024

Patil, Akshata, Phelts, R. Eric, Walter, Todd, and Thoelert, Steffen
Detecting and Localizing Space Based Interference on GNSS Signals using Machine Learning 
Published in Proceedings of the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.

Walter, Todd, Anderson, Jason, and Lo, Sherman
Implementation of Data Authentication on SBAS 
Published in Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024.

Wang, Rebecca, Lai, Yu-Fang, Blanch, Juan, Akos, Dennis, Phelts, Eric, and Walter, Todd
Characterization of Recent GPS Satellite Clock Jumps 
Published in Proceedings of the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.

Wang, Rebecca and Walter, Todd
Performance Characterization of the BeiDou-3 Constellation 
Published in Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024.

Wang, Rebecca, Blanch, Juan, and Walter, Todd
Constellation Fault Monitoring to Support a Precise Point Positioning (PPP) Integrity Service 
Published in Proceedings of the 37th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2024), Baltimore, MD, September 2024.

2023

Anderson, Jason, Lo, Sherman, and Walter, Todd
Addressing a Critical Vulnerability in upcoming Broadcast-only TESLA-based GNSS-enabled Systems
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

Anderson, Jason, Lo, Sherman, Neish, Andrew, and Walter, Todd         
Authentication of Satellite-Based Augmentation Systems with Over-the-Air Rekeying Schemes         
Published in NAVIGATION, Vol. 70 No. 3, Fall 2023, DOI 10.33012/navi.595.

Anderson, Jason, Lo, Sherman, and Walter, Todd       
Authentication Security of Combinatorial Watermarking for GNSS Signal Authentication       
Published in Proceedings of the 36th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2023), Denver, CO, September 2023. *Best Presentation Award

Blanch, Juan, Walter, Todd, and Lai, Yu-Fang       
Evaluation of Tropospheric and Mixed Single - Dual Frequency Error Models in Advanced RAIM       
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

Blanch, Juan and Walter, Todd       
Approaches to Improve Advanced RAIM Protection Levels       
Published in Proceedings of the 36th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2023), Denver, CO, September 2023.

Chen, Yu-Hsuan, Liu, Zixi, Blanch, Juan, Lo, Sherman, and Walter, Todd       
An RFI Testbed for Examining GNSS Integrity in the Various Environments       
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

Dacus, Michael, Liu, Zixi, Lo, Sherman, and Walter, Todd       
Approximating Regional GNSS Interference Sources as a Convex Optimization Problem using ADS-B Data       
Published in Proceedings of the 36th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2023), Denver, CO, September 2023.

Lai, Yu-Fang, Blanch, Juan, and Walter, Todd       
Troposphere Delay Model Error Analysis With Application to Vertical Protection Level Calculation       
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

Lai, Yu-Fang, Blanch, Juan, Walter, Todd, Kahr, Erin, Leahy, Edmond, Silva, Pedro, and Ellum, Cameron       
Prototyping Integrity Monitors for PPP Fault Detections       
Published in Proceedings of the 36th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2023), Denver, CO, September 2023.

Liu, Xinwei, Wang, Rebecca, Blanch, Juan, and Walter, Todd       
Satellite Clock and Ephemeris Error Bounding Characterization for Galileo and Estimated CNAV       
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

Liu, Xinwei       
Characterization of the Clock and Ephemeris Error Distributions of the Global Satellite Navigation System (GNSS)       
Engineer Degree Dissertation, Stanford University, June 2023

Liu, Zixi, Lo, Sherman, Walter, Todd, and Blanch, Juan       
GNSS Interference: Getting to the Source       
Inside GNSS May 26, 2023

Liu, Zixi, Blanch, Juan, Lo, Sherman, and Walter, Todd       
Investigation of GPS interference events with refinement on the localization algorithm       
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

Liu, Zixi, Blanch, Juan, Lo, Sherman, Chen, Yu-Hsuan, and Walter, Todd       
Real Time Detection and Estimation of GNSS Interference Affected Region using ADS-B Data and Bayesian Modeling       
Published in Proceedings of the 36th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2023), Denver, CO, September 2023.

Lo, Sherman, Chen, Yu-Hsuan, San Miguel, Nicolas, Walter, Todd and Akos, Dennis       
Examining Cross Frequency Interference Effects in Multi-Frequency GNSS Receivers       
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

Oak, Sukrut, Pullen, Sam, Lo, Sherman, Colobong, Isaiah, Blanch, Juan, Walter, Todd, Crews, Mark, and Jackson, Robert
GNSS Augmentation by Low-Earth-Orbit (LEO) Satellites: Integrity Performance Under Non-Ideal Conditions       
Published in Proceedings of the 36th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2023), Denver, CO, September 2023.

Patil, Akshata, Phelts, R. Eric, Chen, Yu-Hsuan, Lo, Sherman, and Walter, Todd       
Detecting Space Based Interference on GNSS Signals       
Published in Proceedings of the 36th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2023), Denver, CO, September 2023. *Best Presentation Award

Patil, Akshata, Phelts, R. Eric, Chen, Yu-Hsuan, Lo, Sherman, and Walter, Todd
Can RF interference to GNSS signals be generated by satellites in orbit? Has this occurred, and how can it be detected?
Inside GNSS November 27, 2023

Pullen, Sam, Lo, Sherman, Colobong, Isaiah, Oak, Sukrut, Blanch, Juan, Walter, Todd, Crews, Mark, Jackson, Robert, Young, Stephen, and Huttenhoff, Kevin       
GNSS Constellation Performance Using ARAIM with Inclined Geosynchronous Satellite and Low-Earth-Orbit Satellite Augmentation       
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

San Miguel, Nicolas Roberto, Chen, Yu-Hsuan, Lo, Sherman, Walter, Todd, and Akos, Dennis       
Calibration of RFI Detection Levels in a Low-Cost GNSS Monitor       
Published in the Proceedings of the IEEE/ION Position Location and Navigation Symposium, Monterey, CA, April 2023.

Taylor, Fred, Gattis, Evan, Trapani, Lucca, Akos, Dennis, Lo, Sherman, Walter, Todd, and Chen, Yu-Hsuan  
Software Defined Radio for GNSS Radio Frequency Interference Localization
Published in Sensors, Vol. 24 No. 1: 72, 2023, DOI 10.3390/s24010072.

Wang, Rebecca and Walter, Todd       
Characterization and Comparison of Galileo and GPS Anomalies       
Published in Proceedings of the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.

Wang, Rebecca, Walter, Todd, and Pullen, Sam
What are typical features of GNSS satellite faults in recent years? Are there any differences between satellite constellations?
Inside GNSS March 20, 2023

2022

Anderson, Jason, Lo, Sherman, and Walter, Todd       
Cryptographic Ranging Authentication with TESLA, Rapid Re-keying, and a PRF       
Published in Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

Anderson, Jason, Lo, Sherman, and Walter, Todd       
Efficient and Secure Use of Cryptography for Watermarked Signal Authentication       
Published in Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

Anderson, Jason, Lo, Sherman, and Walter, Todd       
Time Synchronization for TESLA-based GNSS-enabled Systems       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022. *Best Presentation Award

Blanch, Juan, Walter, Todd, Milner, Carl, Joerger, Mathieu, Pervan, Boris, Bouvet, Denis       
Baseline Advanced RAIM User Algorithm: Proposed Updates       
Published in Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

Blanch, Juan and Walter, Todd       
Design of Estimators with Integrity in the Presence of Error Model Uncertainty       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.

Dacus, Michael, Liu, Zixi, Lo, Sherman, and Walter, Todd       
Improved RFI Localization Through Aircraft Position Estimation During Losses in ADS-B Reception       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.

Liu, Xinwei, Blanch, Juan, and Walter, Todd       
Investigation into Satellite Clock and Ephemeris Errors Bounding Uncertainty and Predictability       
Published in Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

Liu, Xinwei, Wang, Rebecca, Blanch, Juan, and Walter, Todd       
Evaluation of Satellite Clock and Ephemeris Error Bounding Predictability for Integrity Applications       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022. *Best Presentation Award

Liu, Zixi, Lo, Sherman, and Walter, Todd       
GNSS Interference Source Localization Using ADS-B data       
Published in Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

Liu, Zixi, Lo, Sherman, and Walter, Todd       
Protecting GNSS for Safe Aviation       
Inside GNSS August 8, 2022

Liu, Zixi, Lo, Sherman, Walter, Todd, and Blanch, Juan       
Real-time Detection and Localization of GNSS Interference Source       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.

Lo, Sherman, Chen, Yu Hsuan, Rothmaier, Fabian, and Walter, Todd       
Demonstrating and Improving the Performance of a GNSS Dual Polarization Antenna (DPA) for Spoof Detection in Flight       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.

Marini-Pereira, Leonardo, de Oliveira Moraes, Alison, and Pullen, Sam       
A Simple and Effective Approach to Real-Time Ionospheric Monitoring for GBAS in Low Latitudes       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.

Nam, Gihun, Sun, K. Andrew, Lee, Jiyun, and Pullen, Sam       
Networked UAV Detection and Alerting of Ionospheric Anomalies within LADGNSS Navigation Framework       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.

Phelts, R. Eric, Walter, Todd, and Sanchez, Rhiannon       
Nominal GPS Signal Deformations: 10 years of WAAS Signal Quality Monitoring       
Published in Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

Phelts, R. Eric and Walter, Todd       
Characterizing GPS Signal Deformations using the WAAS Signal Quality Monitor       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.

Pullen, Sam, Lo, Sherman, Blanch, Juan, Walter, Todd, Katronick, Andrew, Crews, Mark, Jackson, Robert, and Huttenhoff, Kevin       
Inclined Geosynchronous Satellite Augmentation to Maximize Availability of Integrity for Future SBAS and ARAIM Users       
Presented at the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

Pullen, Sam, Walter, Todd, Blanch, Juan, and Wang, Rebecca
What commitments have the various constellation providers made to GNSS users regarding the integrity of their signals and services? How are these commitments transmitted to users, and how can they be updated if circumstances require?
Inside GNSS May 24, 2022

San Miguel, Nicolas Roberto, Chen, Yu-Hsuan, Lo, Sherman, Walter, Todd, and Akos, Dennis       
Stress Testing of a Low-Cost GNSS RFI Monitor       
Published in Proceedings of the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.

Sparks, Lawrence, Altshuler, Eric, Pandya, Nitin, Blanch, Juan, and Walter, Todd       
WAAS and the ionosphere – a historical perspective: Monitoring storms       
Published in NAVIGATION, Vol. 69 No. 1, Winter 2022, pp. 243-58, DOI 10.33012/navi.503.

Taleghani, Leila, Rothmaier, Fabian, Chen, Yu-Hsuan, Lo, Sherman, Walter, Todd, Akos, Dennis, and Granite Gattis, Benon       
Low cost RFI monitor for continuous observation and characterization of localized interference sources       
Published in Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

Taleghani, Leila, Rothmaier, Fabian, Chen, Yu-Hsuan, Lo, Sherman, Walter, Todd, Akos, Dennis, Granite Gattis, Benon, and Langley, Richard B.       
Innovation: Monitoring GNSS interference and spoofing — a low-cost approach       
Published in GPS World, August 17, 2022

Yuan, Matthew and Lo, Sherman       
Examining Reception of GNSS Underwater using a Smartphone       
Published in Proceedings of the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.

2021

Anderson, Jason, Lo, Sherman, Neish, Andrew, and Walter, Todd       
On SBAS Authentication with OTAR Schemes       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Blanch, Juan and Walter, Todd       
Fast Protection Levels for Fault Detection With an Application to Advanced RAIM       
Published in IEEE Transactions on Aerospace and Electronic Systems, vol. 57, no. 1, pp. 55-65, Feb. 2021, doi: 10.1109/TAES.2020.3011997

Blanch, Juan, Liu, Xinwei, and Walter, Todd       
Gaussian Bounding Improvements and an Analysis of the Bias-Sigma Tradeoff for GNSS Integrity       
Published in Proceedings of the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.

Blanch, Juan, Liu, Xinwei, Gunning, Kaz, and Walter, Todd       
Analysis of GNSS Constellation Performance for Advanced RAIM       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Blanch, Juan and Walter, Todd       
A Fault Detection and Exclusion Estimator Designed for Integrity       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Fernández-Hernández, Ignacio, Walter, Todd, Neish, Andrew M., Anderson, Jason, Mabilleau, Mikael, Vecchione, Giovanni, and Châtre, Eric       
SBAS Message Authentication: A Review of Protocols, Figures of Merit and Standardization Plans       
Published in Proceedings of the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.

Fernández-Hernández, Ignacio, Walter, Todd, Mabilleau, Mikael, Tosato, Luciano, Dalla Chiara, Andrea, Pozza, Daniele, Pozzobon, Oscar, Calabrese, Alessandra, Anderson, Jason, and Châtre, Eric       
Message Authentication Candidates for the SBAS Dual Frequency Multi-Constellation Standard       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Gunning, Kazuma       
Safety Critical Bounds for Precise Positioning for Aviation and Autonomy       
Ph.D. Dissertation, Stanford University, March 2021

Hirschberger, Matthew, Lo, Sherman and Walter, Todd       
Reevaluating the Message Loss Rate of the Wide Area Augmentation System (WAAS) in Flight       
Published in Proceedings of the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.

Katz, Alec, Pullen, Sam, Lo, Sherman, Blanch, Juan, Walter, Todd, Katronick, Andrew, Crews, Mark, and Jackson, Robert,       
ARAIM for Military Users: ISM Parameters, Constellation-Check Procedure and Performance Estimates       
Published in Proceedings of the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.

Liu, Zixi, Lo, Sherman, and Walter, Todd       
GNSS Interference Detection Using Machine Learning Algorithms on ADS-B Data       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Lo, Sherman, Rothmaier, Fabian, Miralles, Damian, Akos, Dennis, and Walter, Todd       
Developing a Practical GNSS Spoofing Detection Thresholds for Receiver Power Monitoring       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Marini-Pereira, Leonardo, Pullen, Sam P., and de Oliveira Moraes, Alison       
Reexamining Low-Latitude Ionospheric Error Bounds: An SBAS Approach for Brazil       
Published in IEEE Transactions on Aerospace and Electronic Systems, vol. 57, no. 1, pp. 674-689, Feb. 2021, doi: 10.1109/TAES.2020.3029623.

Nam, Gihun, Kim, Dongwoo, Kim, Noah Minchan, Jiyun Lee, and Pullen, Sam       
Enhanced Local-Area DGNSS for Autonomous Vehicle Navigation: Optimal Smoothing Strategy       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Pullen, Sam, Lo, Sherman, Katz, Alec, Blanch, Juan, Walter, Todd, Katronick, Andrew, Crews, Mark, and Johnson, Robert       
Ground Monitoring to Support ARAIM for Military Users: Alternatives for Rapid and Rare Update Rates       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Rothmaier, Fabian, Chen, Yu-Hsuan Lo, Sherman, and Walter, Todd       
GNSS Spoofing Mitigation in the Position Domain       
Published in Proceedings of the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.

Rothmaier, Fabian, Chen, Yu Hsuan, Lo, Sherman, and Walter, Todd       
GNSS Spoof Detection through Spatial Processing       
Published in NAVIGATION, Vol. 68 No. 2, Summer 2021, pp. 243-58, DOI 10.1002/navi.420.

Rothmaier, Fabian, Taleghani, Leila, Chen, Yu-Hsuan, Lo, Sherman, Phelts, Eric, and Walter, Todd       
GNSS Spoofing Detection through Metric Combinations: Calibration and Application of a General Framework       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021. *Best Presentation Award

Rothmaier, Fabian, Chen, Yu-Hsuan, Lo, Sherman, Blanch, Juan, and Walter, Todd       
Providing Continuity and Integrity in the Presence of GNSS Spoofing       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

Rothmaier, Fabian, Chen, Yu Hsuan, Lo, Sherman, and Walter, Todd       
A Framework for GNSS Spoofing Detection through Combinations of Metrics       
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 57, Issue 6, pp. 3633-3647, doi: 10.1109/TAES.2021.3082673, December 2021

Rothmaier, Fabian       
Statistical Inference for Safe and Continuous Navigation in the Presence of GNSS Spoofing       
Ph.D. Dissertation, Stanford University, December 2021

Walter, Todd, Liu, Zixi, Blanch, Juan, Pham, Kristy, Mick, John, and Wanner, William       
Investigation into September 2020 GPS SVN 74 Performance Anomaly       
Published in Proceedings of the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.

Walter, Todd, Blanch, Juan, de Groot, Lance, and Norman, Laura       
Assessment of Ionospheric Correction Behavior for Use with Precise Point Positioning (PPP)       
Published in Proceedings of the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.

Walter, Todd, Blanch, Juan, and Norman, Laura B.
Innovation: Ionospheric corrections for precise point positioning
Published in GPS World, August 1, 2021

Walter, Todd, Anderson, Jason, and Lo, Sherman       
SBAS Message Schemes to Support Inline Message Authentication       
Published in Proceedings of the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.

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2020

Blanch, Juan, and Walter, Todd       
Stress Testing Advanced RAIM Airborne Algorithms       
Published in Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020.

Blanch, Juan, Gunning, Kazuma, Walter, Todd, de Groot, Lance, and Norman, Laura       
Solution separation-based FD to mitigate the Effects of Local Threats on PPP Integrity       
In Proceedings of the IEEE/ION Position Location and Navigation Symposium (PLANS), Portland, Oregon, April 2020.

Blanch, Juan, Phelts, Eric, Gunning, Kazuma, and Walter, Todd       
Bounding Temporally Correlated Measurement Noise with an Application to GNSS Integrity       
Published in Proceedings of the 33rd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2020), Virtual, September 2020. *Best Presentation Award

de Paula, Eurico R., Martinon, Andre R. F., Moraes, Alison. O., Carrano, Charles, Neto, A. C., Doherty, Patricia, Groves, Keith, Valladares, Cesar E., Crowley, Geoff, Azeem, Irfan, Reynolds, Adam, Akos, Dennis M., Walter, Todd, Beach, Ted L., and Slewaegen, Jean-Marie.       
Performance of 6 Different Global Navigation Satellite System Receivers at Low Latitude Under Moderate and Strong Scintillation       
Published in Earth and Space Science, 8, e2020EA001314. doi: 10.1029/2020EA001314, December, 2020.

Fernandez-Hernandez, Ignacio, Walter, Todd, Neish, Andrew, and O’Driscoll, Cillian       
Independent Time Synchronization for Resilient GNSS Receivers       
Published in Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020.

Jheng, Siang-Lin, Jan, Shau-Shiun, Chen, Yu-Hsuan, and Lo, Sherman       
1090 MHz ADS-B based wide area multilateration system for alternative positioning navigation and timing       
Published in IEEE Sensors Journal, 10.1109/JSEN.2020.2988514, April 2020.

Joerger, M., Zhai, Y., Martini, I., Blanch, J., and Pervan, B.       
ARAIM Continuity and Availability Assertions, Assumptions, and Evaluation Methods       
Published in Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020.

Lewis, Steven W., Chow, Edward C., Nievinski, Felipe G., Akos, Dennis M., and Lo, Sherman       
GNSS Interferometric Reflectometry Signature-based Defense       
Published in NAVIGATION , Vol. 67, No. 4, Winter 2020, pp. 727 - 743, DOI 10.1002/navi.393.

Liu, Zixi, Lo, Sherman, and Walter, Todd       
Characterization of ADS-B Performance under GNSS Interference       
Published in Proceedings of the 33rd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2020), Virtual, September 2020.

Liu, Zixi, Lo, Sherman, and Walter, Todd       
GNSS Interference Characterization and Localization Using OpenSky ADS-B Data       
Published in Proceedings of the OpenSky Symposium https://doi.org/10.3390/proceedings2020059010 November 2020.

Lo, S., Chen, Y.H., Rothmaier, F., Zhang, G., and Lee, C.       
Developing a Dual Polarization Antenna (DPA) for High Dynamic Applications       
Published in Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020.

Lo, Sherman, Chen, Yu‐Hsuan, Enge, Per, Pelgrum, Wouter, Li, Kuangmin, Weida , George, and Soelte, Achim       
Flight test of a pseudo‐ranging signal compatible with existing distance measuring equipment (DME) ground stations       
Published in NAVIGATION , Vol. 67, No. 3, Fall 2020, pp. 567 - 582, DOI 10.1002/navi.376.

Lo, Sherman and Chen, Yu-Hsuan       
Message Design for a Robust Time Signal using Distance Measuring Equipment (DME) Pulse Pair Position Modulated (PPPM) Pseudo lite       
Published in Proceedings of the 2020 European Navigation Conference, Virtual, November 2020.

Lo, Sherman       
Chapter 61: Navigation for Aviation       
Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume II       
Published December 15, 2020 by Wiley, Print ISBN:9781119458418 | Online ISBN:9781119458449 | DOI:10.1002/9781119458449

Milner, Carl, Pervan, Boris, Blanch, Juan, and Joerger, Mathieu       
Evaluating Integrity and Continuity Over Time in Advanced RAIM       
In Proceedings of the IEEE/ION Position Location and Navigation Symposium (PLANS), Portland, Oregon, April 2020.

Miralles, Damian, Bornot, Aurelie, Rouquette, Paul, Levigne, Nathan, Akos, Dennis M, Chen, Yu-Hsuan, Lo, Sherman and Walter, Todd       
An Assessment of GPS Spoofing Detection Via Radio Power and Signal Quality Monitoring for Aviation Safety Operations       
Published in IEEE Intelligent Transportation Systems Magazine, vol. 12, no. 3, pp. 136-146, Fall 2020, doi: 10.1109/MITS.2020.2994117.

Neish, Andrew, Walter, Todd, and Fernandez-Hernandez, I.       
Receiver States for SBAS Data Authentication       
Published in Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020.

Neish, Andrew and Walter, Todd       
Securing GNSS – A Trip Down Cryptography Lane       
Inside GNSS May 2020

Neish, Andrew       
Establishing Trust Through Authentication in Satellite Based Augmentation Systems       
Ph.D. Dissertation, Stanford University, August 2020

Parkinson, Bradford W., Morton, Y. T. Jade, van Diggelen, Frank, and Spilker, James J. Jr.       
Chapter 1. Introduction, Early History, and Assuring PNT (PTA)       
Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume I       
Published December 15, 2020 by Wiley, Print ISBN:9781119458418 | Online ISBN:9781119458449 | DOI:10.1002/9781119458449

Perkins, Adrien       
Fast Interference Localization to Protect Global Navigation Satellite Service Operations       
Ph.D. Dissertation, Stanford University, March 2020

Phelts, R.E., Gunning, K., Blanch, J., and Walter, T.       
Evaluating the Application of PPP Techniques to ARAIM Using Flight Data       
Published in Proceedings of the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020.

Phelts, R. Eric, Gunning, Kazuma, Blanch, Juan, and Walter, Todd       
Innovation: Improving ARAIM       
Published in GPS World, June 13, 2020

Pullen, Sam       
What freeware or open-source software packages are available to support GNSS performance evaluations?       
Inside GNSS January 26, 2020

Pullen, Sam and Joerger, Mathieu       
Chapter 23: GNSS Integrity       
Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume I       
Published December 15, 2020 by Wiley, Print ISBN:9781119458418 | Online ISBN:9781119458449 | DOI:10.1002/9781119458449

Reid, Tyler G. R., Walter, Todd, Enge, Per K., Lawrence, David, Cobb, H. Stewart, Gutt, Greg, O'Conner, Michael, and Whelan, David       
Chapter 43: Navigation from Low Earth Orbit       
Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume II       
Published December 15, 2020 by Wiley, Print ISBN:9781119458418 | Online ISBN:9781119458449 | DOI:10.1002/9781119458449

Reid, Tyler G. R., Walter, Todd, Guinness, Robert, Thombre, Sarang, Kuusniemi, Heidi, and Kjerstad, Norvald       
Chapter 64: Navigation in the Arctic       
Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume II       
Published December 15, 2020 by Wiley, Print ISBN:9781119458418 | Online ISBN:9781119458449 | DOI:10.1002/9781119458449

Rothmaier, Fabian       
Optimal Sequential Spoof Detection based on Direction of Arrival Measurements        
Published in Proceedings of the 33rd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2020), Virtual, September 2020. *Student Paper Award Winner *Best Presentation Award

Walter, Todd, Neish, Andrew, and Blanch, Juan       
A Rigid Message Scheduler for SBAS       
In Proceedings of the IEEE/ION Position Location and Navigation Symposium (PLANS), Portland, Oregon, April 2020.

Walter, Todd       
Chapter 13: Satellite Based Augmentation Systems       
Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume I       
Published December 15, 2020 by Wiley, Print ISBN:9781119458418 | Online ISBN:9781119458449 | DOI:10.1002/9781119458449

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2019

Blanch, Juan, Walter, Todd, and Phelts, R. Eric       
Development and Evaluation of Airborne Multipath Error Bounds for L1-L5       
Published in Proceedings of the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.

Blanch, Juan, Gunning, Kaz, Walter, Todd, De Groot, Lance, Norman, Laura       
Reducing Computational Load in Solution Separation for Kalman Filters and an Application to PPP Integrity       
Published in Proceedings of the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.

Blanch, Juan and Walter, Todd       
Lower Bounds in Optimal Integrity Monitoring       
Published in Proceedings of the ION 2019 Pacific PNT Meeting, Honolulu, Hawaii, April 2019.

Blanch, Juan, Walter, Todd, Berz, Gary, Burns, Jason, Clark, Barbara, Joerger, Mathieu, Mabilleau, Mikael, Martini, Ilaria, Milner, Carl, Pervan, Boris, Lee, Young       
Development of Advanced RAIM Minimum Operational Performance Standards       
Published in Proceedings of the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019.

Fernández-Hernández, Ignacio, Walter, Todd, Alexander, Ken, Clark, Barbara, Châtre, Eric, Hegarty, Chris, Appel, Manuel, Meurer, Michael       
Increasing International Civil Aviation Resilience: A Proposal for Nomenclature, Categorization and Treatment of New Interference Threats       
Published in Proceedings of the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.

Gunning, Kazuma, Blanch, Juan, and Walter, Todd       
SBAS Corrections for PPP Integrity with Solution Separation       
Published in Proceedings of the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.

Gunning, Kazuma, Walter, Todd, and Powell, J. David       
SIS Monitoring for ARAIM in the Absence of Precise Clock Estimates       
Published in Proceedings of the ION 2019 Pacific PNT Meeting, Honolulu, Hawaii, April 2019.

Gunning, Kaz, Blanch, Juan, Walter, Todd, de Groot, Lance, and Norman, Laura       
Design and Evaluation of Integrity Algorithms for PPP in Kinematic Applications       
Inside GNSS June 15 2019

Gunning, Kazuma, Blanch, Juan, Walter, Todd, de Groot, Lance and Norman, Laura       
Integrity for Tightly Coupled PPP and IMU       
Published in Proceedings of the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019.

Jain, Hridayangam, Lo, Sherman, Chen, Yu-Hsuan, Rothmaier, Fabian, and Powell, J. David       
Accommodating Direction Ambiguities in Direction of Arrival based GNSS Spoof Detection       
Published in Proceedings of the ION 2019 Pacific PNT Meeting, Honolulu, Hawaii, April 2019.

Lee, Dong-Kyeong, Petit, Matthias, Miralles, Damian, Lo, Sherman, and Akos, Dennis       
Analysis of Raw GNSS Measurements Derived Navigation Solutions from Mobile Devices with Inertial Sensors       
Published in Proceedings of the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019.

Lo, Sherman, Chen, Yu Hsuan, Akos Dennis, Cotts, Brandon, and Miralles, Damian       
Tests of Crowdsourced Smartphones Measurements to Detect GNSS Spoofing and Other Disruptions       
Published in Proceedings of the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.

Neish, Andrew, Walter, Todd, Enge, Per       
Quantum-resistant authentication algorithms for satellite-based augmentation systems       
Published in NAVIGATION , Vol. 66, No. 1, Spring 2019, pp. 199-209, DOI 10.1002/navi.287.

Neish, Andrew, Walter, Todd, and Powell, J. David       
Design and Analysis of a Public Key Infrastructure for SBAS Data Authentication       
Published in Proceedings of the ION 2019 Pacific PNT Meeting, Honolulu, Hawaii, April 2019. *Best Paper Award

Neish, Andrew, Walter, Todd, and Powell, J. David       
SBAS Data Authentication: A Concept of Operations       
Published in Proceedings of the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019. *Best Presentation Award

Neish, Andrew, Walter, Todd, and Powell, J. David       
Design and analysis of a public key infrastructure for SBAS data authentication       
Published in NAVIGATION , Vol. 66, No. 4, Winter 2020, pp. 831-844, DOI 10.1002/navi.338.

Perkins, Adrien and Walter, Todd       
Paper Trends in ION Conferences from 2007 - 2018       
Published in Proceedings of the ION 2019 Pacific PNT Meeting, Honolulu, Hawaii, April 2019.

Perkins, Adrien, Lo, Sherman, and Powell, J. David       
Measurement Characterization for Localizing Multiple RFI Sources Simultaneously from a UAS       
Published in Proceedings of the ION 2019 Pacific PNT Meeting, Honolulu, Hawaii, April 2019.

Perkins, Adrien, Chen, Yu-Hsuan, Lo, Sherman, Lee, Chiawei, and Powell, J. David       
Real-Time Unmanned Aerial System (UAS) Based Interference Localization in a GNSS Denied Environment       
Published in Proceedings of the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019. *Best Presentation Award

Phelts, R. Eric and Walter, Todd       
Signal Deformation Monitoring for Anomalous Multipath Threats       
Published in Proceedings of the ION 2019 Pacific PNT Meeting, Honolulu, Hawaii, April 2019.

Rothmaier, Fabian, Chen, Yu-Hsuan, Lo, Sherman, and Powell, J. David       
Single GNSS Antenna Heading Estimation       
Published in Proceedings of the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019. *Best Presentation Award

Rothmaier, Fabian, Chen, Yu-Hsuan, and Lo, Sherman       
Improvements to Steady State Spoof Detection with Experimental Validation using a Dual Polarization Antenna       
Published in Proceedings of the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019.

Walter, Todd, Blanch, Juan, Altshuler, Eric       
Safety Analysis of Ranging Biases on the WAAS GEOs       
Published in Proceedings of the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.

Walter, Todd, Blanch, Juan, Gunning, Kazuma       
Standards for ARAIM ISM Data Analysis       
Published in Proceedings of the ION 2019 Pacific PNT Meeting, Honolulu, Hawaii, April 2019.

Walter, Todd, Blanch, Juan, Gunning, Joerger, Mathieu, and Pervan, Boris       
Determination of Fault Probabilities for ARAIM       
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 55, No. 6, December 2019, pp. 3505-3516, DOI 10.1109/TAES.2019.2909727.

Blanch, Juan, Walter, Todd, and Enge, Per       
Fixed Subset Selection to Reduce Advanced RAIM Complexity       
Published in Proceedings of the 2018 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2018.

Blanch, Juan, Walter, Todd, and Enge, Per       
A Formula for Solution Separation without Subset Solutions for Advanced RAIM       
Presented April 2018 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California.

Blanch, Juan, Walter, Todd, Burns, Jason, Martini, Ilaria, Boyero, Juan Pablo, Mabilleau, Mikael, and Berz, Gerhard       
A Proposed Concept of Operations for Advanced Receiver Autonomous Integrity Monitoring (ARAIM)       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.

Blanch, Juan, Walter, Todd, and Enge, Per       
Gaussian Bounds of Sample Distributions for Integrity Analysis       
Published in IEEE Transactions on Aerospace and Electronic Systems, October 2018, DOI 10.1109/TAES.2018.2876583.

Chen, Yu-Hsuan, Lo, Sherman, Perkins, Adrien, Rothmaier, Fabian, Akos, Dennis, and Enge, Per       
Demonstrating Single Element Null Steering Antenna Direction Finding for Interference Detection       
Published in Proceedings of the 2018 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2018.

Dressel, Louis       
Efficient and Low-Cost Localization of Radio Sources with an Autonomous Drone       
Ph.D. Dissertation, Stanford University, December 2018

Garbin Manfredini, Esteban, Akos, Dennis M., Chen, Yu-Hsuan, Lo, Sherman, Walter, Todd, and Enge, Per       
Effective GPS Spoofing Detection Utilizing Metrics from Commercial Receivers       
Published in Proceedings of the 2018 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2018.

Gunning, Kazuma, Blanch, Juan, Walter, Todd, de Groot, Lance, and Norman, Laura       
Design and Evaluation of Integrity Algorithms for PPP in Kinematic Applications       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018. *Best Presentation Award

Hegarty, Christopher , Odeh, Ali, Shallberg, Karl, Wesson, Kyle, Walter, Todd, and Alexander, Ken       
Spoofing Detection for Airborne GNSS Equipment       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.

Miralles, Damian, Levigne, Nathan, Akos, Dennis M., Blanch, Juan, and Lo, Sherman       
Android Raw GNSS Measurements as a New Anti-Spoofing and Anti-Jamming Solution       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.

Lo, Sherman, Chen, Yu Hsuan, Jain, Hridayangam, and Enge, Per       
Robust GNSS Spoof Detection using Direction of Arrival: Methods and Practice       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.

Neish, Andrew, Walter, Todd, and Enge, Per       
Quantum Resistant Authentication Algorithms for Satellite-Based Augmentation Systems       
Published in Proceedings of the 2018 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2018.

Neish, Andrew, Walter, Todd, Enge, Per       
Parameter Selection for the TESLA Keychain       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018. *Best Presentation Award

Neish, Andrew, Lo, Sherman, Chen, Yu-Hsuan, Enge, Per       
Uncoupled Accelerometer Based GNSS Spoof Detection for Automobiles using Statistic and Wavelet Based Tests       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.

Perkins, Adrien, Chen, Yu-Hsuan, Lo, Sherman, and Enge, Per       
Unmanned Aerial System for RFI Localization and GPS Denied Navigation       
Published in Proceedings of the International Flight Inspection Symposium (IFIS), Monterey, California, April, 2018

Perkins, Adrien, Chen, Yu-Hsuan, Lo, Sherman, and Enge, Per       
Vision Based UAS Navigation For RFI Localization       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.

Phelts, R. Eric, Blanch, Juan, Gunning, Kazuma, Walter, Todd, and Enge, Per       
Effect of Aircraft Banking on ARAIM Performance       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.

Ramakrishnan, Shankar       
Enhancing Satellite Navigation for Low Earth and Geostationary Orbit Missions       
Ph.D. Dissertation, Stanford University, October 2018

Reid, Tyler G.R., Neish, Andrew M., Walter, Todd, and Enge, Per K.       
Broadband LEO Constellations for Navigation       
Published in NAVIGATION , Vol. 65, No. 2, Summer 2018, pp. 205-220, DOI 10.1002/navi.234.

Schneckenburger, Nicolas, Fiebig, Uwe-Carsten, Lo, Sherman, Enge, Per, Lilley, Robert       
Characterization and Mitigation of Multipath for Terrestrial based Aviation Radionavigation       
Published in NAVIGATION , Vol. 65, No. 2, Summer 2018, pp. 143-156, DOI 10.1002/navi.235.

Strizic, Luka , Akos, Dennis M., and Lo, Sherman       
Crowdsourcing GNSS Jamming Detection and Localization       
Published in Proceedings of the 2018 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2018.

Walter, Todd, Shallberg, Karl, Altshuler, Eric, Wanner, William, Harris, Chris, and Stimmler, Robert       
WAAS at 15       
Published in Proceedings of the 2018 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2018.

Walter, Todd, Gunning, Kazuma, Phelts, R. Eric, and Blanch, Juan       
Validation of the Unfaulted Error Bounds for ARAIM       
Published in NAVIGATION , Vol. 65, No. 1, Spring 2018, pp. 117-133, DOI 10.1002/navi.214.

Walter, Todd, Blanch, Juan, de Groot, Lance, Norman, Laura, and Joerger, Mathieu       
Ionospheric Rates of Change       
Published in Proceedings of the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.

Walter, Todd, Shallberg, Karl, Altshuler, Eric, Wanner, William, Harris, Chris, and Stimmler, Robert       
WAAS at 15       
Published in NAVIGATION , Vol. 65, No. 4, Winter 2018, pp. 581-600, DOI 10.1002/navi.252.

Zhang, Shiwen, Lo, Sherman, Chen, Yu-Hsuan, Walter, Todd, and Enge, Per       
GNSS Multipath Detection in Urban Environment Using 3D Building Model       
Presented April 2018 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California.

Blanch, Juan, Phelts, R. Eric., Chen, Yu-Hsuan., and Enge, Per       
Initial Results of a Multi-Constellation ARAIM Airborne Prototype       
Published in Proceedings of the 2017 International Technical Meeting of The Institute of Navigation, Monterey, California, January 2017.

Blanch, Juan, Walter, Todd, Enge, Per       
Theoretical Results on the Optimal Detection Statistics for Autonomous Integrity Monitoring       
Published in NAVIGATION , Vol. 64, No. 1, Spring 2017, pp. 123-137, DOI 10.1002/navi.175.

Blanch, Juan, Walter, Todd, and Enge, Per       
A Method to Determine Strict Gaussian Bounds of a Sample Distribution       
Presented September 2017 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Blanch, Juan, Walter, Todd, Enge, Per       
Protection Levels after Fault Exclusion for Advanced RAIM       
Published in NAVIGATION , Vol. 64, No. 4, Winter 2017, pp. 505-514, DOI 10.1002/navi.210.

Bisnath, S., Uijt de Haag, M., Diggle, D. W.,Hegarty, C., Milbert, D., and Walter, T.       
Chapter 12: Differential GNSS and Precise Point Positioning       
Understanding GPS/GNSS: Principles and Applications, Third Edition       
Published 2017 by Artech House, ISBN: 9781630810580

Chen, Yu-Hsuan , Rothmaier, Fabian, Akos, Dennis, Lo, Sherman, and Enge, Per       
Towards a Practical Single Element Null Steering Antenna       
Published in Proceedings of the 2017 International Technical Meeting of The Institute of Navigation, Monterey, California, January 2017.

Closas, Pau, Gusi-Amigo´, Adria`, and Blanch, Juan       
Integrity measures in direct-positioning       
Presented September 2017 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Gunning, Kazuma, Walter, Todd, and Enge, Per       
Characterization of GLONASS Broadcast Clock and Ephemeris: Nominal Performance and Fault Trends for ARAIM       
Published in Proceedings of the 2017 International Technical Meeting of The Institute of Navigation, Monterey, California, January 2017.

Gunning, Kazuma, Walter, Todd, and Enge, Per       
Multi-GNSS Constellation Anomaly Detection and Performance Monitoring       
Presented September 2017 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Hegarty, Chris, Leva, Joe, Van Dyke, Karen, and Walter, Todd       
Chapter 11: Performance of Stand-Alone GNSS       
Understanding GPS/GNSS: Principles and Applications, Third Edition       
Published 2017 by Artech House, ISBN: 9781630810580

Kuusniemi, Heidi, Blanch, Juan, Chen, Yu-Hsuan, Lo, Sherman, Innac, Anna, Ferrara, Giorgia, Honkala, Salomon, Bhuiyan, M. Zahidul H., Thombre, Sarang, Söderholm, Stefan, Walter, Todd, Phelts, R. Eric, Enge, Per K       
Feasibility of fault exclusion related to advanced RAIM for GNSS spoofing detection       
Presented September 2017 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Lawrence, David, Cobb, H. Stewart, Gutt, Greg, O’Connor, Michael, Reid, Tyler G.R., Walter, Todd, and Whelan, David       
Navigation from LEO, Current Capability and Future Promise       
Published in GPS World, July 2017, pp. 42-48.

Lo, Sherman, Chen, Yu Hsuan, Reid, Tyler, Perkins, Adrien, Walter, Todd, and Enge, Per       
The Benefit of Low Cost Accelerometers for GNSS Anti-Spoofing       
Presented May 2017 at the Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii.

Lo, Sherman, Chen, Yu-Hsuan, Reid, Tyler, Perkins, Adrien, Walter, Todd, and Enge, Per       
Consumer Mass Market Accelerometers for GNSS Anti-Spoofing       
Published in Inside GNSS, September/October 2017, pp. 62-71.

Lo, Sherman, Pullen, Sam, Blanch, Juan, Enge, Per, Neri, Alessandro, Palma, Veronica, Salvitti, Maurizio, and Stallo, Cosimo,       
Projected Performance of a Baseline High Integrity GNSS Railway Architecture under Nominal and Faulted Conditions       
Presented September 2017 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Perkins, Adrien, Chen, Yu-Hsuan, Lee, Wei, Lo, Sherman, and Enge, Per       
Development of a Three-Element Beam Steering Antenna for Bearing Determination Onboard a UAV Capable of GNSS RFI Localization       
Presented September 2017 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Phelts, R. Eric, Shallberg, Karl, Walter, Todd, and Enge, Per       
WAAS Signal Deformation Monitor Performance: Beyond the ICAO Threat Model       
Presented May 2017 at the Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii.

Pullen, Sam, Cassell, Rick, Johnson, Bruce, Brenner, Mats, Weed, Doug, Cypriano, Lucas, Topland, Morten, Stakkeland, Morten, Pervan, Boris, Harris, Matt, Saito, Susumu, Lee, Jiyun, Clark, Barbara, Beauchamp, Shelly, Dennis, Joseph       
Impact of Ionospheric Anomalies on GBAS GAST D Service and Validation of Relevant ICAO SARPs Requirements       
Presented September 2017 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Reid, Tyler       
Orbital Diversity for Global Navigation Satellite Systems       
Ph.D. Dissertation, Stanford University, May 2017

Schneckenburger, Nicolas , Walter, Michael, Fiebig, Uwe-Carsten, and Lo, Sherman,       
Geometric rules for terrestrial radionavigation multipath mitigation by averaging       
Published in NAVIGATION , Vol. 64, No. 2, Summer 2017, pp. 231-236, DOI 10.1002/navi.201.

Shallberg, Karl W., Ericson, Swen D., Phelts, Eric, Walter, Todd, Kovach, Karl, and Altshuler, Eric       
Catalog and Description of GPS and WAAS L1 C/A Signal Deformation Events       
Presented January 2017 at the Institute of Navigation (ION) International Technical Meeting, Monterey, California. pp. 508-520.

Walter, Todd, Gunning, Kazuma, Phelts, R. Eric, and Blanch, Juan       
Validation of the Unfaulted Error Bounds for ARAIM       
Presented May 2017 at the Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii.

Walter, Todd and Blanch, Juan       
Improved User Position Monitor for WAAS       
Published in NAVIGATION , Vol. 64, No. 1, Spring 2017, pp. 165-175, DOI 10.1002/navi.180.

Walter, Todd       
Chapter 12: Satellite Based Augmentation Systems       
Springer Handbook of Global Navigation Satellite Systems       
Published 2017 by Springer International Publishing Switzerland, DOI: 10.1007/978-3-319-42928-1

Yoon, Moonseok, Lee, Jiyun, Pullen, Sam, Gillespie, Joseph, Mathur, Navin, Cole, Rich, de Souza, Jonas Rodrigues, Doherty, Patricia, Pradipta, Rezy       
Equatorial Plasma Bubble Threat Parameterization to Support GBAS Operations in the Brazilian Region       
Published in NAVIGATION ,Vol. 64, No. 3, Fall 2017, pp. 309-321, DOI 10.1002/navi.203.

Bang, Eugene, Lee, Jinsil, Walter, Todd, Lee Jiyun       
Preliminary availability assessment to support single-frequency SBAS development in the Korean region       
GPS solutions July 2016, Volume 20, Issue 3, pp 299-312 doi:10.1007/s10291-016-0522-4

Blanch, Juan, Walter, Todd, and Enge, Per K       
A Simple Satellite Exclusion Algorithm for Advanced RAIM       
Presented January 2016 at the Institute of Navigation (ION) International Technical Meeting, Monterey, California.

Blanch, Juan, Chen, Yu-Hsuan, Phelts, R. Eric, Walter, Todd, and Enge, Per,       
Mitigation of Short Duration Satellite Outages for Advanced RAIM and other Integrity Systems Based on GNSS       
Presented September 2016 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Chen, Yu-Hsuan, Perkins, Adrien L. H., Lo, Sherman C., Akos, Dennis M., Blanch, Juan A., Walter, Todd, and Enge, Per K       
Demonstrating ARAIM on UAS using Software Defined Radio and Civilian Signal GPS L1/L2C and GLONASS G1/G2       
Presented January 2016 at the Institute of Navigation (ION) International Technical Meeting, Monterey, California.

Lo, Sherman C., Chen, Yu-Hsuan, Pelgrum, Wouter, Li, Kuangmin, Weida, George, Soelter, Achim, and Enge, Per K       
Flight Test of a Pseudo Ranging Signal Compatible with Existing Distance Measuring Equipment (DME) Ground Stations       
Presented January 2016 at the Institute of Navigation (ION) International Technical Meeting, Monterey, California.

Lo, Sherman C., Chen, Yu-Hsuan, Barrows, Andrew K., Perkins, Adrien L. H., Reid, Tyler G. R., Jan, Shau-Shiun, and Enge, Per K       
Using Traffic Information Services Broadcast (TIS-B) Signals for Aviation Navigation       
Presented April 2016 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Savannah, Georgia.

McMilin, Emily       
Single Antenna Null-Steering for GPS & GNSS Aerial Applications       
Ph.D. Dissertation, Stanford University, March 2016

Neri, Alessandro, Palma, Veronica, Rispoli, Francesco, Pullen, Sam, Zhang, Shiwen, Lo, Sherman, and Enge, Per,       
A Method for Multipath Detection and Mitigation in Railway Control Applications       
Presented September 2016 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Park, Young Shin       
Design of Airport Surface Movement Using Single-Frequency GPS       
Ph.D. Dissertation, Stanford University, August 2016

Perkins, Adrien, Dressel, Louis, Lo, Sherman, Reid, Tyler, Gunning, Kazuma, and Enge, Per       
Demonstration of UAV-Based GPS Jammer Localization During A Live Interference Exercise       
Presented September 2016 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon. *Best Presentation Award

Perkins, Adrien and Enge, Per       
GPS Jammer Localization Using Unmanned Aerial Vehicle       
Presented June 2016 at the International Flight Inspection Symposium (IFIS), Belgrade, Serbia.

Phelts, R. Eric, Blanch, Juan, Chen, Yu-Hsuan, Enge, Per, and Riley, Stuart,       
ARAIM in Flight Using GPS and GLONASS: Initial Results from a Real-time Implementation       
Presented September 2016 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Reid, Tyler G. R., Neish, Andrew M., Walter, Todd, and Enge, Per K.       
Leveraging Commercial Broadband LEO Constellations for Navigation       
Presented September 2016 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon. *Best Presentation Award

Reid, Tyler G. R., Walter, Todd, Enge, Per K., and Sakai, T.       
Orbital representations for the next generation of satellite-based augmentation systems       
GPS solutions October 2016, Volume 20, Issue 4, pp 737–750 doi:10.1007/s10291-015-0485-x

Reid, Tyler G. R., Walter, Todd, Blanch, Juan A., and Enge, Per K.       
GNSS Integrity in the Arctic       
Published in NAVIGATION, Vol. 63, No. 3, Winter 2016, pp. 467-490, DOI 10.1002/navi.169.

Walter, Todd, Gunning, Kazuma, and Blanch, Juan       
Improved Ephemeris Monitoring for GNSS       
Presented January 2016 at the Institute of Navigation (ION) International Technical Meeting, Monterey, California.

Walter, Todd and Blanch, Juan       
Improved User Position Monitor for WAAS       
Presented January 2016 at the Institute of Navigation (ION) International Technical Meeting, Monterey, California.

Walter, Todd, Blanch, Juan, Joerger, Mathieu, and Pervan, Boris S       
Determination of Fault Probabilities for ARAIM       
Presented April 2016 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Savannah, Georgia.

Walter, Todd, Blanch, Juan, and Kropp, Victoria       
Satellite Selection for Multi-Constellation SBAS       
Presented September 2016 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon.

Walter, Todd, Blanch, Juan, and Kropp, Victoria       
Satellite Selection for Aviation Users of Multi-Constellation SBAS       
Inside GNSS November/December 2016

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Fast Multiple Fault Exclusion with a Large Number of Measurements       
Presented January 2015 at the Institute of Navigation (ION) International Technical Meeting, Dana Point, California.

Blanch, Juan A., Walter, Todd, Enge, Per K., Lee, Y., Pervan, Boris S., Rippl, M., Spletter, A., Kropp, V       
Baseline Advanced RAIM User Algorithm and Possible Improvements       
Published in IEEE Transactions on Aerospace and Electronic Systems, Volume 51, No. 1, January 2015.

Blanch, Juan A., Walter, Todd, Enge, Per K., Kropp, V       
A Simple Position Estimator that Improves Advanced RAIM Performance       
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 51, No. 3, July 2015.

Blanch, Juan A., Walter, Todd, Enge, Per K., Pervan, Boris, Joerger, Mathieu, Khanafseh, S., Burns, J., Alexander, K., Boyero, J. P., Lee, Y., Kropp, V., Macabiau, C., Suard, N., Berz, G., Rippl, M., Martini, I., and Perea, S       
Progress on Working Group-C Activities on Advanced RAIM       
Presented September 2015 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

Enge, P., Enge, N., Walter, T., and Eldredge, L.       
Aviation Benefits from Satellite Navigation       
Published in New Space. March 2015, 3(1): 19-35, doi:10.1089/space.2014.0011.

Lo, Sherman C., Chen, Yu-Hsuan, Enge, Per K., and Narins, Mitchell J       
Techniques to Provide Resilient Alternative Positioning, Navigation, and Timing (APNT) Using Automatic Dependent Surveillance - Broadcast (ADS-B) Ground Stations       
Presented January 2015 at the Institute of Navigation (ION) International Technical Meeting, Dana Point, California.

Lo, Sherman C., Chen, Yu-Hsuan, Enge, Per K., and Akos, Dennis M       
Combining L1 Signals for Improved Sensitivity       
Presented January 2015 at the Institute of Navigation (ION) International Technical Meeting, Dana Point, California.

Lo, Sherman, Enge, Per, and Narins, Mitchell,       
Design of a Passive Ranging System Using Existing Distance Measuring Equipment (DME) Signals & Transmitters       
Published in NAVIGATION, Vol. 62, No. 2, Summer 2015, pp. 131-149, DOI 10.1002/navi.83.

Lo, Sherman, Chen, Yu-Hsuan, and Enge, Per       
Flight Test of Universal Access Transceiver (UAT) Transmissions to Provide Alternative Positioning Navigation and Timing (APNT)       
Presented September 2015 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

McMilin, Emily B., Chen, Yu-Hsuan, De Lorenzo, David S., Lo, Sherman C., Akos, Dennis M., and Enge, Per K       
GPS Anti-Jam: A Simple Method of Single Antenna Null-Steering for Aerial Applications       
Presented April 2015 at the Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii.

McMilin, Emily B., De Lorenzo, David S       
Field Test Validation of Single-Element Antenna with Anti-Jam and Spoof Detection       
Presented September 2015 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

McMilin, Emily B., Chen, Yu-Hsuan, De Lorenzo, David S., Akos, Dennis M., Walter, Todd, Lee, Thomas H., and Enge, Per K       
Single Antenna, Dual Use: Theory and Field Trial Results for Aerial Applications of Anti-Jam and Spoof Detection       
Published in Inside GNSS, September/October 2015, pp. 40-53.

Narins, Mitchell J., Lo, Sherman C., Chen, Yu-Hsuan, and Enge, Per K       
A Holistic Approach to the Provision of Communications, Navigation, and Surveillance Services in the 21st Century National Airspace System       
Presented April 2015 at the European Navigation Conference (ENC GNSS 2015), Bordeaux, France.

Perkins, Adrien L. H., Dressel, Louis K., Lo, Sherman C., and Enge, Per K       
Antenna Characterization for UAV Based GPS Jammer Localization       
Presented September 2015 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

Phelts, R. Eric, Altshuler, Eric, Walter, Todd, and Enge, Per K       
Validating Nominal Bias Error Limits Using 4 years of WAAS Signal Quality Monitoring Data       
Presented April 2015 at the Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii.

Reid, Tyler G. R., Walter, Todd, Blanch, Juan A., and Enge, Per K       
GNSS Integrity in the Arctic       
Presented September 2015 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida. *Best Presentation Award

Spicer, James, Perkins, Adrien L. H., Dressel, Louis K., James, Mark, Chen, Yu-Hsuan, Lo, Sherman C., De Lorenzo, David S., and Enge, Per K       
Jammer Hunting with a UAV       
Published in GPS World, May 2015, pp. 30-38.

Walter, Todd and Blanch, Juan A       
Airborne Mitigation Of Constellation Wide Faults       
Presented January 2015 at the Institute of Navigation (ION) International Technical Meeting, Dana Point, California.

Walter, Todd and Blanch, Juan A       
Characterization of GPS Clock and Ephemeris Errors to Support ARAIM       
Presented April 2015 at the Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii.

Walter, Todd
GNSS Augmentations
Published in Inside GNSS, October 15, 2015.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Exclusion for Advanced RAIM: Requirements and a Baseline Algorithm       
Presented January 2014 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Blanch, Juan A., Walter, Todd, Enge, Per K., Stern, Abe, and Altshuler, Eric       
Evaluation of a Covariance-based Clock and Ephemeris Error Bounding Algorithm for SBAS       
Presented September 2014 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

Blanch, Juan A., Walter, Todd, Enge, Per K., Pervan, Boris S., Joerger, Mathieu, Khanafseh, Samer, Burns, Jason, Alexander, Ken, Boyero, Juan Pablo, Lee, Young, Kropp, Victoria, Milner, Carl, Macabiau, Christophe, Suard, Norbert, Berz, Gerhard, and Rippl, Markus       
Architectures for Advanced RAIM: Offline and Online       
Presented September 2014 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

Chen, Yu-Hsuan, Lo, Sherman C., Akos, Dennis M., Choi, Myungjun, Blanch, Juan A., Walter, Todd, and Enge, Per K       
Development of a Real-time GNSS Software Receiver for Evaluating RAIM in Multi-constellation       
Presented January 2014 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Chen, Yu-Hsuan, Lo, Sherman C., Akos, Dennis M., and Enge, Per K       
Direct Comparison of the Multipath Performance of L1 BOC and C/A using On-Air Galileo and QZSS Transmissions       
Presented May 2014 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California.

Chen, Yu-Hsuan, Lo, Sherman C., Jan, Shau-Shiun, and Enge, Per K       
Evaluation & Comparison of Ranging Using Universal Access Transceiver (UAT) and 1090 MHz Mode S Extended Squitter (Mode S ES)       
Presented May 2014 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California.

Chen, Yu-Hsuan, Lo, Sherman C., Jan, Shau-Shiun, Liou, Guan-Jhih, Akos, Dennis M., and Enge, Per K       
Design and Test of Algorithms and Real-Time Receiver to use Universal Access Transceiver (UAT) for Alternative Positioning Navigation and Timing (APNT)       
Presented September 2014 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

Choi, Myungjun       
Evaluation of Advanced Receiver Autonomous Integrity Monitoring for Vertical Guidance Using GPS and GLONASS Signals       
Ph.D. Dissertation, Stanford University, December 2014

Datta Baura, S., Walter, T., Bust, G., and Wanner, B       
Effects of solar cycle 24 activity on WAAS navigation       
Published in Space Weather, Vol. 12, Issue 1, January 2014, Pages 46–63, DOI: 10.1002/2013SW000982.

Jan, Shau-Shiun, Jheng, Siang-Lin, Chen, Yu-Hsuan, and Lo, Sherman C       
Wide Area Multilateration using 1090 MHz ADS-B Signal for Alternative Position Navigation and Timing (APNT)       
Presented September 2014 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

Lo, Sherman C., Chen, Yu-Hsuan, Segal, Benjamin, Peterson, Benjamin B., Lilley, Robert, Erikson, Robert, and Enge, Per K       
Techniques for Mitigating DME Multipath to Alternative Position Navigation and Timing (APNT)       
Presented January 2014 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Lo, Sherman C., Chen, Yu-Hsuan, Zhang, Shiwen, and Enge, Per K       
Hybrid APNT: Terrestrial Radionavigation to Support Future Aviation Needs       
Presented September 2014 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

McMilin, Emily B., De Lorenzo, David S., Walter, Todd, Lee, Thomas H., and Enge, Per K       
Single Antenna GPS Spoof Detection that is Simple, Static, Instantaneous and Backwards Compatible for Aerial Applications       
Presented September 2014 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida.

Narins, Mitchell J., Enge, Per K., Lo, Sherman C., Chen, Yu-Hsuan, and Harrison, Michael       
The Need for a Robust Resilient Position, Navigation, and Timing for the US National Airspace System       
Presented April 2014 at the European Navigation Conference (ENC GNSS 2014), Rotterdam, Netherlands.

Phelts, R. Eric, Blanch, Juan A., Walter, Todd, and Enge, Per K       
The Effect of Nominal Signal Deformations on ARAIM User Performance       
Presented January 2014 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Reid, Tyler G. R. and Tarantino, Paul M       
Arctic Sea Ice Extent Forecasting Using Support Vector Regression       
Presented December 2014 at the International Conference on Machine Learning Applications (ICMLA), Detroit, Michigan

Reid, Tyler G. R., Walter, Todd, Enge, Per K., and Fowler, Ananda       
Crowdsourcing Arctic Navigation Using Multispectral Ice Classification & GNSS       
Presented September 2014 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida. *Best Presentation Award

Seo, Jiwon and Walter, Todd       
Future dual-frequency GPS navigation system for intelligent air transportation under strong ionospheric scintillation       
IEEE Transactions on Intelligent Transportation Systems, volume 15, issue 5, April, 2014, pp. 2224 - 2236

Walter, Todd, Blanch, Juan A., and Enge, Per K       
Reduced Subset Analysis for Multi-Constellation ARAIM       
Presented January 2014 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Wolff, A.M., Akos, D.M., and Lo, S.,       
Potential Radio Frequency Interference with the GPS L5 band for Radio Occultation Measurements       
Published in Atmospheric Measurement Techniques, Volume 7, Issue 11, pp. 3801-3811, 2014, doi:10.5194/amt-7-3801-2014 (amt-2014-52) .

Wong, Gabriel       
Impact of Nominal Signal Deformations on Satellite Navigation Systems       
Ph.D. Dissertation, Stanford University, June 2014

Wong, Gabriel H. W., Chen, Yu-Hsuan, Phelts, R. Eric, Walter, Todd, and Enge, Per K       
Mitigation of Nominal Signal Deformations on Dual-Frequency WAAS Position Errors       
Proceedings of the 27th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014, pp. 3129-3147.

Bang, Eugene, Lee, Jinsil, Lee, Jiyun, Seo, Jiwon, and Walter, Todd F       
Constructing Ionospheric Irregularity Threat Model for Korean SBAS       
Presented April 2013 at the Institute of Navigation (ION) Pacific PNT Meeting in Honolulu, Hawaii.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Results on the Optimal Detection Statistic for Integrity Monitoring       
Presented January 2013 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Blanch, Juan A., Walter, Todd, Phelts, R. Eric, and Enge, Per K       
Near Term Improvements to WAAS Availability       
Presented January 2013 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Blanch, J., Walter, T., Enge, P., Wallner, S., Fernandez, F., Dellago, R., Ioannides, R., Pervan, Boris S., Hernandez, I., Belabbas, B., Spletter, A., and Rippl, M       
Critical Elements for Multi-Constellation Advanced RAIM for Vertical Guidance       
Published in NAVIGATION , Vol. 60, No. 1, Spring 2013, pp. 53-69.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Optimal Positioning for Advanced RAIM       
Published in NAVIGATION , Vol. 60, No. 4, Winter 2013, pp. 279-290.       
Errata Sheet

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Advanced RAIM System Architecture with a Long Latency Integrity Support Message       
Presented September 2013 at the Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS) Conference, Nashville, Tennessee.

Chen, Yu-Hsuan, Lo, Sherman C., Akos, Dennis M., De Lorenzo, David S., and Enge, Per K       
Validation of a Controlled Reception Pattern Antenna (CRPA) Receiver Built from Inexpensive General-purpose Elements During Several Live Jamming Test Campaigns       
Presented January 2013 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Chen, Yu-Hsuan, Lo, Sherman, Akos, Dennis, De Lorenzo, David, and Enge, Per       
Getting Control: Off-the-Shelf Antennas for Controlled-Reception-Pattern Antenna Arrays       
Published in GPS World, February 2013.

Chen, Yu-Hsuan, Lo, Sherman C., Akos, Dennis M., Wong, Gabriel H. W., and Enge, Per K       
A Testbed for Studying Automatic Dependent Surveillance Broadcast (ADS-B) Based Range and Positioning Performance to Support Alternative Position Navigation and Timing(APNT)       
Presented September 2013 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Lee, Chaiwei, Chen, Yu-Hsuan, Wong, Gabriel H. W., Lo, Sherman C., and Enge, Per K       
Multipath Benefits of BOC vs. BPSK Modulated Signals Using On-Air Measurements       
Presented January 2013 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Lo, Sherman C., Chen, Yu-Hsuan, Enge, Per K., Peterson, Benjamin B., Erikson, Robert, and Lilley, Robert       
Distance Measuring Equipment Accuracy Performance Today and for Future Alternative Position Navigation and Timing (APNT)       
Presented September 2013 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee. *Best Presentation Award

Phelts, R. Eric, Wong, Gabriel H. W., Walter, Todd, and Enge, Per K       
Signal Deformation Monitoring for Dual-Frequency WAAS       
Presented January 2013 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Pullen, Samuel P., Enge, Per K., and Lee, Jiyun       
Local-Area Differential GNSS Architectures Optimized to Support Unmanned Aerial Vehicles (UAVs)       
Presented January 2013 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Pullen, Samuel P       
Managing Separation of Unmanned Aerial Vehicles Using High-Integrity GNSS Navigation       
Presented February 2013 at the ENRI International Workshop on ATM/CNS (EIWAC 2013), Tokyo, Japan.

Pullen, Samuel P. and Lee, Jiyun       
Guidance, Navigation, and Separation Assurance for Local-Area UAV Networks: Putting the Pieces Together       
Presented April 2013 at the Institute of Navigation (ION) Pacific PNT Meeting in Honolulu, Hawaii.

Pullen, Samuel P. and Enge, Per K       
Using Outage History to Exclude High-Risk Satellites from GBAS Corrections       
Published in NAVIGATION , Vol. 60, No. 1, Spring 2013, pp. 41-51

Pullen, Samuel P., Enge, Per K., Shaw, Stuart, Frey, Charles, Frye, John, and Souder, Michael       
The Impact of GPS Modernization on Standalone User Performance and Integrity with ARAIM       
Presented September 2013 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Ramakrishnan, Shankararaman, Reid, Tyler G. R., and Enge, Per K       
Leveraging the L1Composite Signal to enable autonomous navigation at GEO and beyond       
Presented September 2013 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Reid, Tyler G. R., Walter, Todd, and Enge, Per K       
L1/L5 SBAS MOPS Ephemeris Message to Support Multiple Orbit Classes       
Presented January 2013 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Reid, Tyler G. R., Walter, Todd, and Enge, Per K       
Qualifying an L5 SBAS MOPS Ephemeris Message to Support Multiple Orbit Classes       
Presented September 2013 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Walter, Todd, Blanch, Juan A., Choi, Myungjun, Reid, Tyler G. R., and Enge, Per K       
Incorporating GLONASS into Aviation RAIM Receivers       
Presented January 2013 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Walter, Todd, Blanch, Juan A., and Enge, Per K       
Implementation of the L5 SBAS MOPS       
Presented September 2013 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Azoulai, Laurent, Neri, Pierre, Milner, Carl, Macabiau, Christophe, and Walter, Todd F       
SBAS Error Modeling for Category I Autoland       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Bang, Eugene, Lee, Jiyun, Seo, Jiwon, Pullen, Samuel P., and Close, Sigrid       
Automated Ionosphere Front Velocity Estimation Algorithm for Ground-Based Augmentation Systems       
Presented January 2012 at the Institute of Navigation (ION) International Technical Meeting, Newport Beach, California.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Optimal Positioning for Advanced RAIM       
Presented January 2012 at the Institute of Navigation (ION) International Technical Meeting, Newport Beach, California.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Satellite Navigation for Aviation in 2025       
Published in Proceedings of the IEEE, Vol. 100, Special Centennial Issue, pp.1821-30

Blanch, Juan A., Walter, Todd, Enge, Per K., Lee, Young, Pervan, Boris S., Rippl, Markus, and Spletter, Alex       
Advanced RAIM User Algorithm Description: Integrity Support Message Processing, Fault Detection, Exclusion, and Protection Level Calculation       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Borowski, Holly, Isoz, Oscar, Eklöf, Fredrik Marsten, Lo, Sherman C., and Akos, Dennis M       
Detection of False GNSS Signals Using AGC       
Published in GPS World in April 2012.

Chen, Yu-Hsuan       
A Study of Geometry and Commercial-Off-The-Shelf (COTS) Antennas for Controlled Reception Pattern Antenna (CRPA) Arrays       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee. *Student Paper Award Winner

Chen, Yu-Hsuan, Juang, Jyh-Ching, Seo, Jiwon, Lo, Sherman C., Akos, Dennis M., De Lorenzo, David S., and Enge, Per K       
Design and Implementation of Real-Time a Software Radio for Anti-Interference GPS/WAAS Sensors       
Published in Sensors, No. 12, pp. 13417-40, 2012.

Choi, Myungjun, Blanch, Juan A., Walter, Todd, Akos, Dennis M., Enge, Per K       
Evaluation of Multi-constellation Advanced RAIM for Vertical Guidance Using GPS and GLONASS Signals with Multiple Faults.       
Published in Proceedings of the 25^th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS 2012), 17 - 21 September 2012, Nashville, Tennessee.

Chu, Jiangping       
Mixed One-way and Two-way Ranging to Support Alternative Position Navigation and Timing       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee. *Student Paper Award Winner

De Lorenzo, David S., Rife, Jason H., Lo, Sherman C., and Enge, Per K       
Calibrating adaptive antenna arrays for high-integrity GPS       
Published in GPS Solutions, Vol. 16, No. 2, pp. 221-30, DOI 10.1007/s10291-011-0224-x.

Gao, Grace Xingxin, Gunning, Kazuma, Walter, Todd, and Enge, Per K       
Impact of Personal Privacy Devices for WAAS Aviation Users       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Heng, Liang       
Safe Satellite Navigation with Multiple Constellations: Global Monitoring of GPS and GLONASS Signal-In-Space Anomalies       

Ph.D. Dissertation, Stanford University, December 2012

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
Statistical Characterization of GLONASS Broadcast Clock Errors and Signal-In-Space Errors       
Presented January 2012 at the Institute of Navigation (ION) International Technical Meeting, Newport Beach, California.

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
Automated Verification of Potential Signal-In-Space Anomalies Using Ground Observation Data       
Presented May 2012 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California.

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
GLONASS Signal-in-Space Anomalies Since 2009       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee. *Best Presentation Award

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
GPS Signal-in-Space Integrity Performance Evolution in the Last Decade: Data Mining 400,000,000 Navigation Messages from a Global Network of 400 Receivers       
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 48, No. 4, Oct 2012.

Kim, M., Lee, Jiyun, Pullen, Samuel P., and Gillespie, J       
Data Quality Improvements and Applications of Long-Term Monitoring of Ionospheric Anomalies for GBAS       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Lee, Jiyun, Jung, Sungwook, Kim, Minchan, Seo, Jiwon, Pullen, Samuel P., and Close, Sigrid       
Results from Automated Ionospheric Data Analysis for Ground-Based Augmentation Systems (GBAS)       
Presented January 2012 at the Institute of Navigation (ION) International Technical Meeting, Newport Beach, California.

Lo, Sherman C. and Enge, Per K       
Signal Structure Study for a Passive Ranging System using Existing Distance Measuring Equipment (DME)       
Presented January 2012 at the Institute of Navigation (ION) International Technical Meeting, Newport Beach, California.

Lo, Sherman and Enge, Per       
Assessing the Capability of Distance Measuring Equipment (DME) to Support Future Air Traffic Capacity       
Published in NAVIGATION , Vol. 59, No. 4, Winter 2012, pp. 249-261, DOI 10.1002/navi.24.

Lo, Sherman and Enge, Per       
Capacity Study of Multilateration (MLAT) based Navigation for Alternative Position Navigation and Timing (APNT) Services for Aviation       
Published in NAVIGATION , Vol. 59, No. 4, Winter 2012, pp. 263-279, DOI 10.1002/navi.25.

Narins, Mitchell J. and Lo, Sherman C       
The Benefit of Alternative Position, Navigation, and Timing (APNT) to Aviation and Other User Communities for Precise Time and Frequency Services       
Published April 2012 in Proceedings of the Integrated Communications Navigation and Surveillance (ICNS) Conference in Alexandria, Virginia.

Narins, Mitchell J. and Lo, Sherman C       
The Need for a Robust Precise Time and Frequency Alternative to Global Navigation Satellite Systems       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Narins, Mitch, Lombardi, Michael, Enge, Per, Peterson, Ben, Lo, Sherman C., and Akos, Dennis M       
The Need for a Robust Precise Time and Frequency Alternative to Global Navigation Satellite Systems       
Published in GPS World in November 2012.

Narins, Mitch, Lombardi, Michael, Enge, Per, Peterson, Ben, Lo, Sherman, and Akos, Dennis,       
The Need for a Robust Precise Time and Frequency Alternative to Global Navigation Satellite Systems       
Published in The Journal of Air Traffic Control, Volume 55, Issue 1, Winter 2012.

Pullen, Samuel P., Gao, Grace Xingxin, Tedeschi, Carmen, and Warburton, John       
The Impact of Uninformed RF Interference on GBAS and Potential Mitigations       
Presented January 2012 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Pullen, Samuel P. and Gao, Grace X       
GNSS Jamming in the Name of Privacy: Potential Threat to GPS Aviation       
Published in Inside GNSS, March/April 2012, pp. 34-43.

Seo, Jiwon, Lee, Jiyun, Pullen, Samuel P., Enge, Per K., and Close, Sigrid       
Targeted Parameter Inflation Within Ground-Based Augmentation Systems to Minimize Anomalous Ionospheric Impact       
Published in Journal of Aircraft, Vol. 49, No. 2, March/April 2012.

Sundlisæter, Tale, Reid, Tyler G. R., Johnson, Christopher, Wan, Stephanie       
GNSS and SBAS System of Systems: Considerations for Applications in the Arctic       
Presented October 2012 at the 63^rd International Astronautical Congress, Naples, Italy.

Walter, et al       
Innovation: Ionospheric Scintillations       
Published in GPS World, April 2012, pp. 44-50.

Walter, Todd, Blanch, Juan A., and Enge, Per K       
A Framework for Analyzing Architectures that Support ARAIM       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Walter, Todd, Blanch, Juan A., and Enge, Per K       
L1/L5 SBAS MOPS to Support Multiple Constellations       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Walter, Todd F       
GNSS Augmentations: When A Signal in Space Isn't Enough       
Published in Inside GNSS, September/October 2012.

Walter, Todd, Blanch, Juan, Phelts, R. Eric, and Enge, Per       
Evolving WAAS to Serve L1/L5 Users       
Published in NAVIGATION , Vol. 59, No. 4, Winter 2012, pp. 317-327, DOI 10.1002/navi.21.

Wong, Gabriel H. W., Chen, Yu-Hsuan, Phelts, R. Eric, Walter, Todd, and Enge, Per K       
Measuring Code-Phase Differences Due to Inter-Satellite Hardware Differences       
Presented September 2012 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Optimization of a Vertical Protection Level Equation for Dual Frequency SBAS       
Presented January 2011 at Institute of Navigation (ION) International Technical Meeting in San Diego, California.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
A Clock and Ephemeris Algorithm for Dual Frequency SBAS       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Blanch, Juan A., Walter, Todd, Enge, Per K., Waller, Stefan, Fernandez, Francisco, Dellago, Riccardo, Ioannides, Pervan, Boris S., Hernandez, Ignacio, Belabbas, Boubeker, Spletter, Alexandru, and Rippl, Markus       
A Proposal for Multi-Constellation Advanced RAIM for Vertical Guidance       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Carroll, Jonathan, Chan, Bryan, Harner, Charles, Reid, Tyler G. R., Tarantino, Paul M., and Yu, Chi Yau Tony       
Commercial GPS in the Stratosphere: Cell Phone GPS Receiver Performance on a High Altitude Weather Balloon       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Chen, Yu-Hsuan       
Design and Implementation of a Real-Time GNSS Receiver and its Applications in the Presence of Interference and Ionospheric Scintillation       
Ph.D. Dissertation, National Cheng Kung University, Tainan, Taiwan, R.O.C., November 2011

Chen, Yu-Hsuan, Juang, Jyh-Ching, De Lorenzo, David S., Seo, Jiwon, Lo, Sherman C., Enge, Per K., and Akos, Dennis M       
Real-Time Dual-Frequency (L1/L5) GPS/WAAS Software Receiver       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Choi, Myungjun, Blanch, Juan A., Walter, Todd, and Enge, Per K       
Advanced RAIM Demonstration using Four Months of Ground Data       
Presented January 2011 at Institute of Navigation (ION) International Technical Meeting in San Diego, California.

Choi, Myungjun, Blanch, Juan A., Akos, Dennis M., Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
Demonstrations of Multi-Constellation Advanced RAIM for Vertical Guidance Using GPS and GLONASS Signals       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Gao, Grace Xingxin, Heng, Liang, Walter, Todd, and Enge, Per K       
Breaking the Ice: Navigation in the Arctic       
Published in Inside GNSS, Vol. 6, No. 5, pp. 60-64, Sept/Oct 2011.

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
Statistical Characterization of GPS Signal-In-Space Errors       
Presented January 2011 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
Statistical Characterization of GLONASS Broadcast Ephemeris Errors       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
Digging into GPS Integrity: Charting the Evolution of Signal-in-Space Performance by Data Mining 400,000,000 Navigation Messages       
Published in GPS World, Vol. 22, No. 11 pp. 44-9, November 2011.

Lee, Jiyun, Jung, Sungwook, and Pullen, Samuel P       
Enhancements of Long Term Ionospheric Anomaly Monitoring for the Ground-Based Augmentation System       
Presented January 2011 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Lee, Jiyun, Seo, Jiwon, Park, Young Shin, Pullen, Samuel P., and Enge, Per K       
Ionospheric Threat Mitigation by Geometry Screening in Ground-Based Augmentation Systems       
Published in Journal of Aircraft, 2011.

Lo, Sherman C. and Enge, Per K       
Capacity Study of Two Potential Alternative Position Navigation and Timing (APNT) Technologies for Aviation       
Presented January 2011 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Lo, Sherman C., Peterson, Benjamin B., Akos, Dennis M., Narins, Mitchell J., Loh, Robert, and Enge, Per K       
Alternative Position Navigation & Timing (APNT) Based on Existing DME and UAT Ground Signals,       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Misra, Pratap and Enge, Per       
Global Positioning System: Signals, Measurments and Performance (Revised 2nd Edition)       
Textbook: Revised 2nd Edition Published in 2011. Ganga-Jamuna Press, P.O. Box 633, Lincoln, MA 01773.

Pullen, Samuel P., Walter, Todd, and Enge, Per K       
SBAS and GBAS Integrity for Non-Aviation Users: Moving Away from "Specific Risk"       
Presented January 2011 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Pullen, Samuel P., Walter, Todd, and Enge, Per K       
Integrity for Non-Aviation Users       
Published in GPS World, July 2011.

Pullen, Samuel P., and Enge, Per K       
Using Outage History to Exclude High-Risk Satellites from GBAS Corrections       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Seo, Jiwon, Chen, Yu-Hsuan, De Lorenzo, David S., Lo, Sherman C., Enge, Per K., and Akos, Dennis M       
Real-Time Software Receiver Using Massively Parallel Processors for GPS Adaptive Antenna Array Processing (PRESENTATION)       
Presented January 2011 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Seo, Jiwon, Walter, Todd, and Enge, Per K       
Correlation of GPS signal fades due to ionospheric scintillation for aviation applications       
Published in Advances in Space Research, No. 47, pp. 1777-88, July 2011.

Seo, Jiwon, Walter, Todd, and Enge, Per K       
Availability Impact on GPS Aviation due to Strong Ionospheric Scintillation       
Published in IEEE Transactions on Aerospace and Electronic Systems, 2011.

Seo, Jiwon, Chen, Yu-Hsuan, De Lorenzo, David S., Lo, Sherman C., Walter, Todd, Enge, Per K., Akos, Dennis M., and Lee, Jiyun       
A Real-Time Capable Software-Defined Receiver Using GPU for Adaptive Anti-Jam GPS Sensors       
Published in Sensors, 2011.

Sparks, Lawrence, Blanch, Juan, and Pandya, Nitin       
Estimating ionospheric delay using kriging: 1. Methodology       
Published in Radio Science, 46, RS0D21, 27 October 2011.

Sparks, Lawrence, Blanch, Juan, and Pandya, Nitin       
Estimating ionospheric delay using kriging: 2. Impact on satellite-based augmentation system availability       
Published in Radio Science, 46, RS0D22, 28 October 2011.

Thoelert, Steffen, Erker, Stefan, Furthner, Johann, and Meurer, Michael (DLR German Aerospace Center), Gao, Grace Xingxin, Heng, Liang, Walter, Todd, and Enge, Per (Stanford University)       
First Signal in Space Analysis of GLONASS K-1       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Walter, Todd, Blanch, Juan A., Phelts, R. Eric, and Enge, Per K       
Evolving WAAS to Serve L1/L5 Users       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon. *Best Presentation Award

Wong, Gabriel H. W., Phelts, R. Eric, Walter, Todd, and Enge, Per K       
Alternative Characterization of Analog Signal Deformation for GNSS-GPS Satellites       
Presented January 2011 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Wong, Gabriel H. W., Phelts, R. Eric, Walter, Todd, and Enge, Per K       
Bounding Errors Caused by Nominal GNSS Signal Deformations       
Presented September 2011 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Becker, Georg T., Lo, Sherman C., De Lorenzo, David S., Enge, Per K., and Paar, Christof       
Secure Location Verification -- A Security Analysis of GPS Signal Authentication       
Published in Proceedings of DBSec 2010, the IFIP WG 11.3 Conference on Data and Applications Security, pp. 366-73.

Blanch, Juan A., Walter, Todd, and Enge, Per K.       
RAIM with Optimal Integrity and Continuity Allocations Under Multiple Failures       
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 46, No. 3, July 2010, pp. 1235-47.

Blanch, Juan A., Choi, Myungjun, Walter, Todd, Enge, Per K., and Suzuki, Kazushi       
Prototyping Advanced RAIM for Vertical Guidance       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Chen, Yu-Hsuan, Juang, Jyh-Ching, De Lorenzo, David S., Seo, Jiwon, Lo, Sherman C., Enge, Per K., and Akos, Dennis M       
Real-Time Software Receiver for GPS Controlled Reception Pattern Antenna Array Processing       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Chiou, Tsung-Yu       
Design of a Doppler-Aided GPS Navigation System for Weak Signals Caused By Strong Ionospheric Scintillation       
Ph.D. Dissertation, Stanford University, May 2010

Datta-Barua, Seebany, Lee, Jiyun, Pullen, Samuel P., Luo, Ming, Ene, Alexandru, Qiu, Di, Zhang, Godwin, and Enge, Per K       
Ionospheric Threat Parameterization for Local Area Global-Positioning-System-Based Aircraft Landing Systems       
Published in Proceedings of the AIAA Journal of Aircraft, Vol. 47, No. 4, pp. 1141-51, July-August 2010.

De Lorenzo, David S., Lo, Sherman C., Seo, Jiwon, Chen, Yu-Hsuan, and Enge, Per K       
The WAAS/L5 Signal for Robust Time Transfer: Adaptive Beamsteering Antennas for Satellite Time Synchronization       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Eldredge, Leo, Enge, Per K., Harrison, Mike, Kenagy, Randy, Lo, Sherman C., Loh, Robert, Lilly, Robert, Narins, Mitchell J., and Niles, Rick       
Alternative Positioning, Navigation, and Timing (PNT) Study       
International Civil Aviation Organization (ICAO) Navigation Systems Panel (NSP) Working Group Meetings, Montreal, Canada May 2010.

Gao, Grace Xingxin, Heng, Liang, Wong, Phelts, Eric, Gabriel, Blanch, Juan A., Walter, Todd, Enge, Per K., Erker, Stefan, and Thoelert, Steffen       
GPS in Mid-life with an International Team of Doctors: Analyzing IIF-1 Satellite Performance and Backward-Compatibility       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon. *Best Presentation Award

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
GPS Ephemeris Error Screening and Results for 2006-2009       
Presented January 2010 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K       
GPS Signal-in-Space Anomalies in the Last Decade: Data Mining of 400,000,000 GPS Navigation Messages       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Khanafseh, Samer, Yang, Fan, Pervan, Boris S., Pullen, Samuel P., and Warburton, John       
Carrier Phase Ionospheric Gradient Ground Monitor for GBAS with Experimental Validation       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Kim, Euiho, Walter, Todd, and Enge Per K       
Unaugmented GPS-Based Flight Inspection System       
Published in IEEE Transactions on Aerospace and Electronics Systems, Vol. 46, No. 2, April 2010.

Koenig, Michael       
Optimizing the Decision Rule of a GPS Integrity Monitoring System for Improved Availability       
Ph.D. Dissertation, Stanford University, March 2010

Lee, Jiyun, Jung, Sungwook, Bang, Eugene, Pullen, Samuel P., and Enge, Per K       
Long Term Monitoring of Ionospheric Anomalies to Support the Local Area Augmentation System       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Lo, Sherman C., Enge, Per K., Niles, Frederick, Loh, Robert, Eldredge, Leo, and Narins, Mitchell J       
Preliminary Assessment of Alternative Navigation Means for Civil Aviation       
Presented January 2010 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Lo, Sherman C. and Enge, Per K       
Authenticating Aviation Augmentation System Broadcasts       
Presented May 2010 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Palm Springs, California.

Lo, Sherman, Peterson, Benjamin, and Enge, Per,       
Assessing the Security of a Navigation System: A Case Study using Enhanced Loran       
Published in ATTI Dell'Istituto Italiano Di Navigazione, Vol.190 ISSN:1120-6977, 2010.

Lo, Sherman, Peterson, Benjamin, Hardy, Tim, and Enge, Per,       
Improving Loran Coverage with Low Power Transmitters       
Published in The Journal of Navigation, volume 63, issue 01, pp. 23-38, January 2010.

Murphy, Tim, Harris, Matt, Park, Young Shin, and Pullen, Samuel P       
GBAS Differentially Corrected Positioning Service Ionospheric Anomaly Errors Evaluated in an Operational Context       
Presented January 2010 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Narins, Mitchell J., Eldredge, Leo, Enge, Per K., Harrison, Mike, Kenagy, Randy, and Lo, Sherman C       
Alternative Positioning Navigation and Timing -- The Need for Robust Radionavigation       
Published in Proceedings of the Royal Institute of Navigation, Westminster, London, UK November-December 2010.

Park, Young Shin, Pullen, Samuel P., and Enge, Per K       
Enabling LAAS Airport Surface Movement: Mitigating the Anomalous Ionospheric Threat       
Presented May 2010 at the IEEE/ION Position Location and Navigation Symposium (PLANS), Palm Springs, California.

Park, Young Shin, Pullen, Samuel P., and Enge, Per K       
A Study of Severe Multipath Errors for the Proposed GBAS Airport Surface Movement Application       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon. *Best Presentation Award

Peterson, Benjamin B., Lo, Sherman C., and Enge, Per K       
Simple Loran Cycle Error Detection Algorithms for Maritime Harbor Entrance Approach Operations       
Presented January 2010 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Phelts, R. Eric, Gao, Grace Xingxin, Wong, Gabriel H. W., Heng, Liang, Walter, Todd, and Enge, Per K. (Stanford University), Erker, Stafen, and Thoelert, Steffen (DLR-German Aerospace Center)       
Aviation Grade: Chips off the Block IIF (Evaluating the IIF-1 for Aviation Users)       
Published in Inside GNSS July/August 2010.

Powell, J. David, and Walter, Todd F       
Space Weather: Its Effect on GNSS, DGNSS, SBAS, and Flight Inspection       
Presented June 2010 at the International Flight Inspection Symposium (IFIS), Beijing, China.

Pullen, Samuel P., Luo, Ming, Walter, Todd, and Enge, Per K       
Using SBAS to Enhance GBAS User Availability: Results and Extensions to Enhance Air Traffic Management       
Published September 2010 in Proceedings of the ENRI International Workshop on ATM/CNS in Tokyo, Japan.

Qiu, Di, Boneh, Dan, Lo, Sherman, and Enge, Per,       
Reliable Location-Based Services from Radio Navigation Systems       
Published in Sensors, 2010, Vol. 10, Issue 12, pp. 11369-11389, doi:10.3390/s101211369 December 2010

Seo, Jiwon       
Overcoming Ionospheric Scintillation for Worldwide GPS Aviation       
Ph.D. Dissertation, Stanford University, June 2010.

Sparks, Lawrence, Blanch, Juan, and Pandya, Nitin       
Kriging as a Means of Improving WAAS Availability       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Suzuki, Kazushi, Pullen, Samuel P., Enge, Per K., and Ono, Takeshi       
Evaluation of Dual-Frequency GBAS Performance using Data from Public Receiver Networks       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Tang, Haochen, Pullen, Samuel P., Enge, Per K., Grattton, Livio, Pervan, Boris S., Brenner, Mats, Scheitlin, Joe, and Kline, Paul       
Ephemeris Type A Fault Analysis and Mitigation for LAAS       
Presented May 2010 at the IEEE/ION Position Location and Navigation Symposium (PLANS) in Indian Wells, California.

Thoelert, Steffen and Erker, Stafen (DLR-German Aerospace Center), Heng, Liang, Phelts, R. Eric, Gao, Grace Xingxin, Wong, Gabriel H. W., Walter, Todd, and Enge, Per (Stanford University)       
On the Air: New Signals from the First GPS IIF Satellite       
Published in Inside GNSS July/August 2010.

Walter, Todd, Blanch, Juan A., and Enge, Per K       
Coverage Improvement for Dual Frequency SBAS PRESENTATION (in PDF)       
Presented January 2010 at the Institute of Navigation (ION) International Technical Meeting, San Diego, California.

Walter, Todd, Enge, Per and Blanch, Juan A       
Future Augmented       
Published in GPS World March 2010.

Walter, Todd, Blanch, Juan A., and Enge, Per K       
Evaluation of Signal in Space Error Bounds to Support Aviation Integrity       
Published in NAVIGATION, Vol. 57, No 2., Summer 2010, pp. 101-113.

Walter, Todd, Blanch, Juan A., and Enge, Per K       
Vertical Protection Level Equations for Dual Frequency SBAS       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon. *Best Presentation Award

Walter, Todd       
Wide-Area Augmentation System       
Published in Yearbook of Science & Technology, by McGraw-Hill, 2010

Wong, Gabriel H. W., Phelts, Eric, Walter, Todd, and Enge, Per K       
Characterization of Signal Deformations for GPS and WAAS Satellites       
Presented September 2010 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon.

Becker, Georg, Lo, Sherman C., De Lorenzo, David S., Qiu, Di, Paar, Christof, and Enge, Per K       
Efficient authentication mechanisms for navigation systems — a radio-navigation case study       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Blanch, Juan A., Mayer, Christoph, Lo, Sherman C., Walter, Todd, and Enge, Per K       
Hysteresis in RAIM       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia. *Best Presentation Award

De Lorenzo, David S., Lo, Sherman C., Enge, Per K., Feuerstein, Marty, Bhattacharya, Tarun, Spain, Steve, and Kang, Zhengjiu       
Design and Performance of a Minimum-Variance Hybrid Location Algorithm Utilizing GPS and Cellular Received Signal Strength for Positioning in Dense Urban Environments       
Presented January 2009 at the Institute of Navigation (ION) International Technical Meeting, Anaheim, California.

De Lorenzo, David S., Lo, Sherman C., Cohen, Morris, Chang, Jeff, Inan, Umran S., and Enge, Per K       
A Miniaturized Loran H-field Antenna for Handheld Devices       
Presented October 2009 at the International Loran Association 38^th Annual Meeting, Portland, Maine.

Ene, Alexandru       
Utilization of Modernized Global Navigation Satellite Systems for Aircraft-Based Navigation Integrity       
Ph.D. Dissertation, Stanford University, March 2009

Gao, Grace Xingxin, Heng, Liang, De Lorenzo, David S., Lo, Sherman C., Akos, Dennis M., Chen, Alan, Walter, Todd, Enge, Per K., and Parkinson, Bradford W       
Modernization Milestone: Observing the First GPS Satellite with an L5 Payload       
Published in Inside GNSS, Vol. 3, No. 4, pp. 60-64, May/June 2009.

Gao, Grace Xingxin, Tang, Haochen, Blanch, Juan A., Lee, Jiyun, Walter, Todd, and Enge, Per K       
Methodology and Case Studies of Signal-in-Space Error Calculation: Top-down Meets Bottom-up PRESENTATION (in PDF)       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Gao, Grace Xingxin, Chen, Alan, Lo, Sherman C., De Lorenzo, David S., Walter, Todd, and Enge, Per K       
Compass-M1 Broadcast Codes in E2, E5b, and E6 Frequency Bands       
Published in IEEE Journal of Selected Topics in Signal Processing, Vol. 3., No. 4, pp. 599-612.

Jan, Shau-Shiun, Chan, Wyant, and Walter, Todd F       
MATLAB Algorithm Availability Simulation Tool       
Published in GPS Solutions, Vol. 13., No. 4, September 2009.

Lee, Jiyun, Pullen, Samuel P., and Enge, Per K       
Sigma Overbounding using a Position Domain Method for the Local Area Augmentation of GPS       
Published in Proceedings of the IEEE Transactions on Aerospace and Electronic Systems, Vol. 45, No 4, pp. 1262-74, October 2009.

Lo, Sherman C., Wenzel, Robert, Morris, Peter, and Enge, Per K.,       
Developing and Validating the Loran Temporal ASF Bound Model for Aviation       
Published in NAVIGATION , Vol. 56, No. 1, Spring 2009, pp. 9-21, DOI 10.1002/j.2161-4296.2009.tb00440.x.

Lo, Sherman C., Peterson, Benjamin B., and Enge, Per K       
Assessing the Security of a Navigation System: A Case Study using Enhanced Loran PRESENTATION (in PDF)       
Presented May 2009 at the European Navigation Conference GNSS, Naples, Italy.

Lo, Sherman C., De Lorenzo, David S., Enge, Per K., Akos, Dennis M., and Bradley, Paul       
Signal Authentication: A Secure Civil GNSS for Today       
Published in Inside GNSS, Sept/Oct 2009, pp. 30-39.

Lo, Sherman C., Peterson, Benjamin, and Enge, Per K       
Loran PF, SF, ASF for the Radio Technical Committee Maritime (RTCM)       
Presented October 2009 at the International Loran Association 38^th Annual Meeting, Portland, Maine.

Lo, Sherman C., Wenzel, Robert, and Enge, Per K       
Analysis and Modeling of Skywave Behavior       
Presented October 2009 at the International Loran Association 38^th Annual Meeting, Portland, Maine.

Lo, Sherman C. and Enge, Per K.,       
Methodology and Design for the Broadcast of GNSS Integrity Information derived from SBAS on Low Bandwidth Data Channels       
Published in NAVIGATION , Vol. 56, No. 4, Winter 2009, pp. 289-307, DOI 10.1002/j.2161-4296.2009.tb01762.x.

Park, Young Shin, Pullen, Samuel P., and Enge, Per K       
Enabling the LAAS Differentially Corrected Positioning Service (DCPS): Design and Requirements Alternatives       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Phelts, R. Eric       
Sensitivity of Code Tracking Methods to PRN Differences       
Presented May 2009 at the European Navigation Conference GNSS, Naples, Italy.

Phelts, R. Eric, Walter, Todd, and Enge, Per K       
Characterizing Nominal Analog Signal Deformation on GNSS Signals       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Pullen, Samuel P       
Providing Integrity for Satellite Navigation: Lessons Learned (Thus Far) from the Financial Collapse of 2008-2009       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia. *Best Presentation Award

Pullen, Samuel P./span>, Park, Young Shin, and Enge, Per K       
Impact and mitigation of ionospheric anomalies on ground-based augmentation of GNSS       
Published in the AGU Electronic Journal, Radio Science, 44, RSOA21, 2009.

Qiu, Di       
Security from Location       
Ph.D. Dissertation, Stanford University, December 2009

Qiu, Di, De Lorenzo, David S., Lo, Sherman C., Boneh, Dan, and Enge, Per K       
Physical Pseudo Random Function in Radio Frequency Sources for Security       
Presented January 2009 at the Institute of Navigation (ION) International Technical Meeting, Anaheim, California.

Qiu, Di, Boneh, Dan, Lo, Sherman C., and Enge, Per K       
Robust Location Tag Generation from Noisy Location Data for Security Applications       
Presented January 2009 at the Institute of Navigation (ION) International Technical Meeting, Anaheim, California.

Qiu, Di, Lo, Sherman C., De Lorenzo, David S., and Enge, Per K       
Pattern Classification for Geotag Generation       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Seo, Jiwon, Walter, Todd, and Enge, Per K       
Availability Benefit of Future Dual Frequency GPS Avionics under Strong Ionospheric Scintillation       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Seo, Jiwon, Walter, Todd, Chiou, Tsung-Yu, and Enge, Per K       
Characteristics of deep GPS signal fading due to ionospheric scintillation for aviation receiver design       
Published in the AGU Electronic Journal, Radio Science, 2009.

Tang, Haochen, Blanch, Juan A., Walter, Todd, and Enge, Per K       
Flight Test Data Validation of Dual-Frequency GPS Measurement Error Characteristics PRESENTATION (in PDF)       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Walter, Todd, Blanch, Juan A., and Enge, Per K       
Evaluation of Signal in Space Error Bounds to Support Aviation Integrity       
Presented September 2009 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Position error bound calculation for GNSS using measurement residuals       
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 3, July 2008.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
A Simple Algorithm for Dual Frequency Ground Monitoring Compatible with ARAIM       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Chiou, Tsung-Yu, Seo, Jiwon, Walter, Todd, and Enge, Per K       
Performance of a Doppler-Aided GPS Navigation System for Aviation Applications under Ionospheric Scintillation       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Datta-Barua, S, Mannucci, A.J., Walter, Todd, and Enge, P       
Altitudinal variation of midlatitude localized TEC enhancement from ground- and space-based measurements       
Published in Space Weather, Vol. 6, S10D06, October 2008.

Datta-Barua, Seebany, Walter, Todd, Blanch, Juan A., and Enge, Per K       
Bounding higher-order ionosphere errors for the dual-frequency GPS user       
Published in Radio Science, Vol. 43, RS5010, October 2008.

Ene, Alexandru, Blanch, Juan A., Walter, Todd and Powell, J. David       
Validation of Multiple Hypothesis RAIM Algorithm using Dual-frequency GNSS Signals       
Presented April 2008 at the European Navigation Conference GNSS/ Toulouse Space Show, Toulouse, France.

Gao, Grace Xingxin       
Towards Navigation based on 120 Satellites: Analyzing the New Signals       
Ph.D. Dissertation, Stanford University, September 2008

Gao, Grace Xingxin, Chen, Alan, Lo, Sherman C., De Lorenzo, David S.,, Walter, Todd, and Enge, Per K       
Compass-M1 Broadcast Codes and Their Application to Acquisition and Tracking       
Presented January 2008 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Gao, Grace Xingxin, Akos, Dennis M., Walter, Todd, and Enge, Per K       
GIOVE-B on the Air: Understanding Galileo's New Signals       
Published in Inside GNSS, May/June2008.

Hsu, Po-Hsin, Chiu, Timothy, Golubev, Yuri, and Phelts, R. Eric       
Test Results for the WAAS Signal Quality Monitor       
Presented May 2008 at the IEEE/ION Position Location and Navigation Symposium, Monterey, California.

Jan, Shau-Shiun, Gebre-Egziabher, Demoz, Walter, Todd, and Enge, Per K       
Improving GPS-Based Landing System Performance using an Empirical Barometric Altimeter Confidence Bound       
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 1, January 2008.

Johnson, Gregory W., Swaszek, Peter F., Hartnett, Richard J., Dykstra, Ken, Shalaev, Ruslan and Lo, Sherman C       
Temporal Variation of Loran ASFs and their Effects on HEA Navigation       
Presented April 2008 at the European Navigation Conference GNSS/ Toulouse Space Show, Toulouse, France.

Kim, Euiho, Walter, Todd, and Powell, J. David       
GNSS-based Flight Inspection Systems       
Presented June 2008 at the International Flight Inspection Symposium, Oklahoma City, Oklahoma.

Konovaltsev, Andriy, De Lorenzo, David S., Hornbostel, Achim, and Enge, Per K       
Mitigation of Continuous and Pulsed Radio Interference with GNSS Antenna Arrays       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Lo, Sherman C., Wenzel, Robert, Johnson, Greg, and Enge, Per K       
Assessment of the Methodology for Bounding Loran Temporal ASF for Aviation       
Presented January 2008 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Lo, Sherman C., Peterson, Benjamin B., and Enge, Per K       
Using Loran for Broadcast of Integrity Information for Modernized Global Navigation Satellite Systems (GNSS)       
Presented April 2008 at the European Navigation Conference GNSS/ Toulouse Space Show, Toulouse, France.

Lo, Sherman C., Peterson, Benjamin B., Boyce, C. O. Lee, and Enge, Per K       
Loran Coverage Availability Simulation Tool       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Lo, Sherman C., Peterson, Benjamin B., Boyce, C. O. Lee, and Enge, Per K       
Loran Coverage Availability Simulation Tool*       
Presented October 2008 at the Royal Institute of Navigation (RIN) NAV08/International Loran Association 37^th Annual Meeting, Westminster, London, UK. (*Slightly expanded version of ION paper with same title.)

Park, Young Shin, Pullen, Samuel P., and Enge, Per K       
Mitigation of Anomalous Ionosphere Threat to Enhance Utility of LAAS Differentially Corrected Positioning Service (DCPS)       
Presented May 2008 at the IEEE/ION Position Location and Navigation Symposium, Monterey, California.

Peterson, Benjamin B., Lo, Sherman C. and Enge, Per K       
Integrating Loran and GNSS for Safety of Life Applications       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Pullen, Samuel P., Park, Young Shin, and Enge, Per K       
The Impact and Mitigation of Ionosphere Anomalies on Ground-Based Augmentation of GNSS       
Presented May 2008 at the 12^th International Ionospheric Effects Symposium, Alexandria, Virginia.

Pullen, Samuel P       
Satellite Navigation Integrity Assurance: Lessons Learned from Hurricane Katrina       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Qiu, Di, Lo, Sherman C., and Enge, Per K       
A Measure of Loran Location-based Parameters       
Presented May 2008 at the IEEE/ION Position Location and Navigation Symposium, Monterey, California.

Ramakrishnan, Shankar, Lee, Jiyun, Pullen, Samuel P., and Enge, Per K       
Targeted Ephemeris Decorrelation Parameter Inflation for Improved LAAS Availability during Severe Ionosphere Anomalies       
Presented January 2008 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Ramakrishnan, Shankar, Gao, Grace Xingxin, De Lorenzo, David S., Walter, Todd, Enge, Per K., and Akos, Dennis M       
Design and Analysis of Reconfigurable Embedded GNSS Receivers Using Model-Based Design Tools       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Rife, Jason H. and Phelts, R. Eric       
Formulation of a Time-Varying Maximum Allowable Error for Ground-Based Augmentation Systems       
Published in IEEE Transactions on Aerospace and Electronic Systems, Vol. 44, No. 2, April 2008.

Rife, Jason H., Pullen, Samuel P., De Lorenzo, David S., Kim, Ung-Souk, Koenig, Michael, Chiou, Tsung-Yu, Khanafseh, Samer, Kempny, Bartosz, and Pervan, Boris S       
Navigation, Interference Suppression, and Fault Monitoring in the Sea-Based Joint Precision Approach and Landing System       
Published in IEEE Proceedings, Vol. 96, No. 12., pp. 1958-75.

Schroth, Georg, Ene, Alexandru, Blanch, Juan A., Walter, Todd and Enge, Per K       
Failure Detection and Exclusion via Range Consensus       
Presented April 2008 at the European Navigation Conference GNSS/ Toulouse Space Show, Toulouse, France.

Schroth, Georg, Rippl, Markus, Ene, Alexandru, Blanch, Juan A., Belabbas, Boubeker, Walter, Todd, Enge, Per K., and Meurer, Michael       
Enhancements of the Range Consensus Algorithm (RANCO)       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Seo, Jiwon, Walter, Todd, Chiou, Tsung-Yu, and Enge, Per K       
Characteristics of Deep GPS Signal Fading Due to Ionospheric Scintillation for Aviation Receiver Design       
Presented May 2008 at the 12^th International Ionospheric Effects Symposium, Alexandria, Virginia.

Seo, Jiwon, Walter, Todd, Chiou, Tsung-Yu, Blanch, Juan A., and Enge, Per K       
Evaluation of Deep Signal Fading Effects Due to Ionospheric Scintillation on GPS Aviation Receivers       
Presented September 2008 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia.

Walter, Todd, Blanch, Juan A., Enge, Per K., Pervan, Boris S., and Gratton, Livio       
Future Architectures to Provide Aviation Integrity       
Presented January 2008 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Walter, Todd, Blanch, Juan, Enge, Per, Pervan, Boris, and Gratton, Livio       
Shaping Aviation Integrity: Two RAIMs for Safety       
Published in GPS World, Vol. 19, nr 4, April 2008.

Walter, Todd, Enge, Per K., Blanch, Juan A., and Pervan, Boris S       
Worldwide Vertical Guidance of Aircraft Based on Modernized GPS and New Integrity Augmentations       
Published in Proceedings of the IEEE, Vol. 96, N0. 12, December 2008.

Blanch, Juan A., Walter, Todd, and Enge, Per K.       
Understanding PHMI for Safety of life applications in GNSS       
Presented January 2007 at the Institute of Navigation National Technical Meeting, San Diego, California.

Blanch, Juan A., Ene, Alex, Walter, Todd, and Enge, Per K       
An Optimized Multiple Hypothesis RAIM Algorithm for Vertical Guidance       
Presented September 2007 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Boyce, C. O. Lee       
Atmospheric Noise Mitigation for Loran       
Ph.D. Dissertation, Stanford University, June 2007

Chiou, Tsung-Yu, Walter, Todd, Gebre-Egziahber, Demoz, Akos, Dennis M., and Enge, Per K       
Model Analysis on the Performance of an Inertial Aided FLL-Assisted-PLL Carrier-Tracking Loop in the Presence of Ionospheric Scintillations       
Presented January 2007 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Chiou, Tsung-yu       
On the Probability Density Function and Stability Properties for a Cross-Product Frequency-Locked Loop       
Presented September 2007 at the Institute of Navigation GNSS Conference, Fort Worth, Texas.

Datta-Barua, Seebany       
Ionospheric Threats to the Integrity of Airborne GPS users       
Ph.D. Dissertation, Stanford University, December 2007

Datta-Barua, Seebany, Walter, Todd, Pullen, Samuel P., and Enge, Per K       
Modeling the 20 November 2003 Ionosphere Storm with GRACE       
Presented September 2007 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

De Lorenzo, David       
Navigation Accuracy and Interference Rejection for GPS Adaptive Antenna Arrays       
Ph.D. Dissertation, Stanford University, August 2007

De Lorenzo, David S., Antreich, Felix, Denks, Holmer, Hornbostel, Achim, Weber, Christian, and Enge, Per K       
Testing of Adaptive Beamsteering for Interference Rejection in GNSS Receivers       
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland.

Do, Ju-Yong       
Road to Seamless Positioning: Hybrid Positioning System Combining GPS and Television Signals       
PRESENTATION mode (in PDF)       
Ph.D., Stanford University, May 2008 (Presentation, April 2007)

Do, Ju-Yong, Rabinowitz, Matthew and Enge, Per K       
Multi-Fault Tolerant RAIM Algorithm for Hybrid GPS/TV Positioning       
Presented January 2007 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Do, Ju-Yong, Rabinowitz, Matthew and Enge, Per K       
Robustness of TOA and TDOA Positioning Under Suboptimal Weighting Conditions       
Published in IEEE Transactions on Aerospace Electronic Systems, 2007.

Ene, Alexandru, Blanch, Juan A., and Powell, J. David       
Fault Detection and Elimination for Galileo-GPS Vertical Guidance       
Presented January 2007 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Ene, Alexandru       
Multiple Hypothesis RAIM with Real-Time FDE and Forecasted Availability for Combined Galileo-GPS Vertical Guidance       
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland.

Gao, Grace Xingxin, De Lorenzo, David S., Lo, Sherman C., Akos, Dennis M., Chen, Alan, Walter, Todd, and Enge, Per K       
Galileo GIOVE-A Broadcast E5 Codes and their Application to Acquisition and Tracking       
Presented January 2007 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Gao, Grace Xingxin, Datta-Barua, Seebany, Walter, Todd, and Enge, Per K       
Ionosphere Effects for Wideband GNSS Signals       
Presented April 2007 at the Institute of Navigation (ION) Annual Meeting, Cambridge, Massachusetts.

Gao, Grace Xingxin, De Lorenzo, David S., Walter, Todd, and Enge, Per K       
Acquisition and Tracking of GIOVE-A Broadcast L1/E5/E6 Signals and Analysis of DME/TACAN Interference on Receiver Design       
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland.

Gao, Grace Xingxin, Chen, Alan. Lo, Sherman C., De Lorenzo, David S., and Enge, Per K       
GNSS over China: The Compass MEO Satellite Codes       
Published in Inside GNSS, July/August 2007, pp. 36-43.

Gao, Grace Xingxin       
DME/TACAN Interference and its Mitigation in L5/E5 Bands       
Presented September 2007 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas. *Best Presentation Award

Kim, Euiho, Walter, Todd, and Powell, J. David       
Adaptive Carrier Smoothing using Code and Carrier Divergence       
Presented January 2007 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Kim, Euiho, Walter, Todd, and Powell, J. David       
WAAS-Based Flight Inspection System       
Presented April 2007 at the Institute of Navigation (ION) Annual Meeting, Cambridge, Massachusetts.

Kim, Euiho, Walter, Todd, and Powell, J. David       
Standalone GPS-Based Flight Inspection System       
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland.

Kim, Ung Suok       
Mitigation of Signal Biases Introduced by Controlled Reception Pattern Antennas in a High Integrity Carrier Phase Differential GPS System       
Ph.D. Dissertation, Stanford University, March 2007

Konno, Hiroyuki       
Design of an Aircraft Landing System using Dual-Frequency GNSS       
Ph.D. Dissertation, Stanford University, December 2007

Konno, Hiroyuki       
Dual-Frequency Smoothing for CAT III LAAS: Performance Assessment Considering Ionosphere Anomalies       
Presented September 2007 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Lo, Sherman C., Peterson, Benjamin B., and Enge, Per K       
Proving the Integrity of the Weighted Sum Squared Error (WSSE) Loran Cycle Confidence Algorithm       
Presented January 2007 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Lo, Sherman C., Peterson, Benjamin B., Swaszek, Peter, and Enge, Per K       
Loran Data Modulation: Extensions and Examples       
Published in IEEE Transactions on Aerospace Electronic Systems, April 2007.

Lo, Sherman C., Peterson, Benjamin B., and Enge, Per K       
Loran Data Modulation: A Primer       
Published in IEEE Aerospace and Electronic Systems Magazine, Tutorial IV, September 2007.

Lo, Sherman C., Johnson, Greg, Swaszek, Peter, Wenzel, Robert, Morris, Peter, and Enge, Per K       
Using Seasonal Monitor Data to Assess Aviation Integrity       
Presented October 2007 at the International Loran Association 36^th Annual Meeting, Orlando, Florida.

Lo, Sherman C., Peterson, Benjamin B., and Enge, Per K       
Proving the Integrity of the Weighted Sum Squared Error (WSSE) Loran Cycle Confidence Algorithm       
Published in NAVIGATION: The Journal of the Institute of Navigation, Vol. 54, Number 4, 2007.

Park, Young Shin, Zhang, Godwin, Pullen, Samuel P., Lee, Jiyun, and Enge, Per K       
Data-Replay Analysis of LAAS Safety during Ionosphere Storms       
Presented September 2007 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Phelts, R. Eric       
Range Biases on Modernized GNSS Codes       
Presented May 2007 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland.

Pullen, Samuel P       
Worldwide Trends in GNSS Development and their Implications for Civil User Performance and Safety       
Presented November 2007 at the Japan GNSS/GPS Symposium, Tokyo, Japan.

Qiu, Di, Lo, Sherman C., Peterson, Benjamin B., and Enge, Per K       
Geoencryption Using Loran       
Presented January 2007 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Qiu, Di       
Security Analysis of Geoencryption: A Case Study Using Loran       
Presented September 2007 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Qiu, Di, Lo, Sherman C., and Enge, Per K       
Geoencryption with Loran       
Presented October 2007 at the International Loran Association 36^th Annual Meeting, Orlando, Florida.

Qiu, Di, Lo, Sherman C., and Enge, Per K       
Security for Insecure Times: Geoencryption with Loran       
Published in GPS World November 2007.

Quigley, Morgan, Abbeel, Pieter, De Lorenzo, David S., Gu, Yi, Bolouki, Sara, Akos, Dennis M., and Ng, Andrew Y       
Portable GPS Baseband Logging       
Presented September 2007 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Seo, Jiwon, Walter, Todd, Marks, Edward, Chiou, Tsung-Yu, and Enge, Per K       
Ionospheric Scintillation Effects on GPS Receivers during Solar Minimum and Maximum       
Presented June 2007 at the International Beacon Satellite Symposium, Boston, Massachusetts.

Swaszek, Peter, Johnson, Gregory, Hartnett, Richard, and Lo, Sherman C       
An Investigation into the Temporal Correlation at the ASF Monitor Sites       
Presented October 2007 at the International Loran Association 36^th Annual Meeting, Orlando, Florida.

Walter, Todd, Blanch, Juan A., and Enge, Per K       
L5 Satellite Based Augmentation Systems Protection Level Equations       
Presented December 2007 at the International Global Navigation Satellite Systems (IGNSS) Symposium, Sydney, Australia.

Zhang, Godwin, Lee, Jiyun, Datta-Barua, Seebany, Pullen, Samuel P., and Enge, Per K       
Low-Elevation Ionosphere Spatial Anomalies Discovered from the 20 November 2003 Storm       
Presented January 2007 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California.

Boyce, C.O.Lee, Lo, Sherman C., Powell, J. David, and Enge, Per K       
Mitigating Atmospheric Noise for Loran       
Presented September 2006 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas. *Best Presentation Award

Boyce, C.O.Lee, Lo, Sherman C., Powell, J. David, and Enge, Per K       
Analysis of Noise and Cycle Selection in a Loran Receiver       
Presented October 2006 at the International Loran Association 35^th Annual Meeting, Groton, Connecticut.

Datta-Barua, Seebany, Walter, Todd, Blanch, Juan A., and Enge, Per K       
Bounding Higher Order Ionosphere Errors for the Dual Frequency GPS User       
Presented September 2006 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

De Lorenzo, David S., Rife, Jason H., Enge, Per K., and Akos, Dennis M       
Navigation Accuracy and Interference Rejection for an Adaptive GPS Antenna Array ]  [ PRESENTATION (in PDF)       
Presented September 2006 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas. *Best Presentation Award

Do, Ju-Yong, Rabinowitz, Matthew, and Enge, Per K       
Performance of TOA and TDOA in a Non-homogeneous Transmitter Network Combining GPS and Terrestrial Signals       
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, California.

Do, Ju-Yong, Rabinowitz, Matthew, and Enge, Per K       
Performance of Hybrid Positioning System Combining GPS and Television Signals       
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, California.

Ene, Alexandru, Blanch, Juan A., and Walter, Todd F       
Galileo-GPS RAIM for Vertical Guidance       
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, California.

Ene, Alexandru       
Further Development of Galileo-GPS RAIM for Vertical Guidance       
Presented September 2006 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas. *Best Presentation Award

Gao, Grace Xingxin, Spilker, James J., Walter, Todd, Enge, Per K., and Pratt, Anthony       
Code Generation Scheme and Property Analysis of Broadcast Galileo L1 and E6 Signals       
Presented September 2006 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Kim, Euiho, Walter, Todd, and Powell, J. David       
A Reference Point-based Precise Relative Positioning Method Using a Single Frequency Receiver       
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, California.

Kim, Euiho, Peled, Uri, Walter, Todd, and Powell, J. David       
A Development of WAAS-Aided Flight Inspection Truth System       
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, California.

Kim, Euiho, Walter, Todd, and Powell, J. David       
WAAS-Aided Flight Inspection Truth System       
Presented June 2006 at the 14^th International Flight Inspection Symposium (IFIS), Toulouse, France.

Kim, Euiho, Walter, Todd, and Powell, J. David       
Optimizing WAAS Accuracy/Stability For a Single Frequency Receiver       
Presented September 2006 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Konno, Hiroyuki, Pullen, Samuel P., Rife, Jason H., and Enge, Per K       
Evaluation of Two Types of Dual-Frequency Differential GPS Techniques under Anomalous Ionosphere Conditions       
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, California.

Konno, Hiroyuki, Pullen, Samuel P., Rife, Jason H., and Enge, Per K       
Ionosphere Monitoring Methodology for Hybrid Dual-Frequency LAAS       
Presented September 2006 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Lee, Jiyun, Pullen, Samuel P., Datta-Barua, Seebany, and Enge, Per K       
Assessment of Nominal Ionosphere Spatial Decorrelation for LAAS       
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, California.

Lee, Jiyun, Pullen, Samuel P., Enge, Per K., Pervan, Boris S., and Gratton, Livio       
Monitoring GPS Satellite Orbit Errors for Aircraft Landing Systems       
Published in Journal of Aircraft, Vol. 43, No.3, May-June 2006.

Lee, Jiyun, Luo, Ming, Pullen, Samuel P., Park, Young Shin, Enge, Per K., and Brenner, Mats       
Position-Domain Geometry Screening to Maximize LAAS Availability in the Presence of Ionosphere Anomalies       
Presented September 2006 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas.

Lo, Sherman C., Peterson, Benjamin B., and Enge, Per K       
Assessing the Loran Cycle Confidence Algorithm       
Presented October 2006 at the International Loran Association 35^th Annual Meeting, Groton, Connecticut.

Lo, Sherman C., and Enge, Per K       
Preliminary Assessment of Loran for Required Navigation Performance 1.0       
Presented October 2006 at the International Loran Association 35^th Annual Meeting, Groton, Connecticut.

Phelts, R. Eric, and Akos, Dennis M       
Effects of Signal Deformations on Modernized GNSS Signals       
Journal of Global Positioning Systems Vol.5 No.1-2, 2006.

Pullen, Samuel P., Rife, Jason H., and Enge, Per K       
Prior Probability Model Development to Support System Safety Verification in the Presence of Anomalies       
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, California.

Rife, Jason H., Phelts, R. Eric       
Formulation of a Time-Varying Maximum Allowable Error for Ground-Based Augmentation Systems       
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, California.

Rife, Jason H., Pullen, Samuel P., Walter, Todd, Phelts, R. Eric, Pervan, Boris S., and Enge, Per K       
WAAS-Based Threat Monitoring for a Local Airport Monitor (LAM) that Supports Category I Precision Approach       
Presented April 2006 at the IEEE/ION Position Location and Navigation Symposium, San Diego, California.

Rife, Jason H., Pullen, Samuel P., Enge, Per K., and Pervan, Boris S       
Paired Overbounding for Nonideal LAAS and WAAS Error Distributions       
Published in IEEE Transactions on Aerospace and Electronic System, Vol. 42, No.4, October 2006.

Seo, Jiwon, Rife, Jason H., Pullen, Samuel P., Walter, Todd, and Enge, Per K       
Field Data Analysis for a Range-Based Local Airport Monitor for WAAS       
Presented January 2006 at the Institute of Navigation's National Technical Meeting, Monterey, California.

Walter, Todd, and Powell, J. David       
Satellite-based approaches facilitate more efficient inspection process       
Published in ICAO Journal, Vol 61, No 2, March/April 2006

Walter, Todd, and Powell, J. David       
Flight Inspection of GNSS SBAS Procedures       
Presented June 2006 at the 14^th International Flight Inspection Symposium (IFIS), Toulouse, France.

Walter, Todd, and Enge, Per       
The Wide-Area Augmentation System       
Published in EGNOS The European Geostationary Navigation Overlay System - A Cornerstone of Galileo by ESA Publications, 2006

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Error Bound Optimization using Second Order Cone Programming       
Presented January 2005 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Protection Level Calculation in the Presence of Heavy Tail Errors Using Measurement Residuals       
Presented July 2005 at the European Navigation Conference GNSS 2005, Munich, Germany.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Protection Level Calculation Using Measurement Residuals: Theory and Results       
Presented September 2005 at the Institute of Navigation GNSS Conference, Long Beach, California.

Boyce, Lee, Lo, Sherman C., Powell, J. David, and Enge, Per K       
Noise Assessment and Mitigation for Loran for Aviation       
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, Massachusetts.

Boyce, Lee, Lo, Sherman C., Powell, J. David, and Enge, Per K       
Atmospheric Noise: Data Collection and Analysis       
Presented October 2005 at the International Loran Association 34^th Annual Meeting, 2005, Santa Barbara, California.

Chiou, Tsung-Yu       
GPS Receiver Performance Using Inertial-Aided Carrier Tracking Loop       
Presented September 2005 at the Institute of Navigation's GNSS Conference, Long Beach, California.

Datta-Barua, Seeany, Walter, Todd, Konno, Hiroyuki, Blanch, Juan A., and Enge, Per K       
Verification of Low Latitude Ionosphere Effects on WAAS during October 2003 Geomagnetic Storm       
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, Massachusetts.

Datta-Barua, Seeany, Walter, Todd, Blanch, Juan A., and Enge, Per K       
Can WAAS Availability Be Inferred From Geomagnetic Data? An Analysis       
Proceedings of the Ionospheric Effects Symposium 2005, Alexandria, Virginia: 3-5 May 2005.

De Lorenzo, David S., Gautier, Jennifer D., Rife, Jason H., Enge, Per K., and Akos, Dennis M       
Adaptive Array Processing for GPS Interference Rejection       
Presented September 2005 at the Institute of Navigation's GNSS Conference, Long Beach, California.

Do, Juyong, Rabinowitz, Matthew, Enge, Per K       
Linear Time-of-Arrival Estimation in a Multipath Environment by Inverse Correlation Method       
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, Massachusetts.

Ene, Alexandru, Qiu, Diu, Luo, Ming, Pullen, Samuel P., and Enge, Per K       
A Comprehensive Ionosphere Storm Data Analysis Method to Support LAAS Threat Model Development       
Presented January 2005 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Gebre-Egziabher, Demoz, Razavi, Alireza, Enge, Per K., Gautier, Jennifer, Pullen, Sam, Pervan, Boris S., and Akos, Dennis M.       
Sensitivity and Performance Analysis of Doppler-Aided GPS Carrier-Tracking Loops        
Published in NAVIGATION , Vol. 52, No. 2, Summer 2005, pp. 49-60.

Kim, Ung-Souk       
Analysis of Carrier Phase and Group Delay Biases Introduced by CRPA Hardware       
(Student Paper Award) Presented September 2005 at the Institute of Navigation's GNSS Conference, Long Beach, California. *Best Presentation Award

Koenig, Michael, Rife, Jason H., Pullen, Samuel P., and Enge, Per K       
Optimizing Channel Selection for the JPALS' Land-based Integrity Monitor       
Presented September 2005 at the Institute of Navigation's GNSS Conference, Long Beach, California.

Konno, Hiroyuki, Pullen, Samuel P., Luo, Ming, and Enge, Per K       
Analysis of Ionosphere Gradient Using Japan GEONET Data       
Presented January 2005 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Lee, Jiyun       
GPS-Based Aircraft Landing Systems with Enhanced Performance Beyond Accuracy       
Ph.D. Dissertation, Stanford University, March 2005

Lo, Sherman C., Morris, Peter and and Enge, Per K       
Early Skywave Detection Network: Preliminary Design and Analysis       
Presented October 2005 at the International Loran Association 34th Annual Meeting, 2005, Santa Barbara, California.

Luo, Ming, Pullen, Samuel P., Datta-Barua, Seebany, Zhang, Godwin, Walter, Todd, and Enge, Per K       
LAAS Study of Slow-Moving Ionosphere Anomalies and Their Potential Impacts PRESENTATION (in PowerPoint)       
Presented September 2005 at the Institute of Navigation's GNSS Meeting, Long Beach, California.

Powell, J. David, Jennings, Chad W., and Holforty, Wendy L       
Use of ADS-B and Perspective Displays to Enhance Airport Capacity       
Presented November 2005 at the 24^th Digital Avionics Systems Conference, Washington, D.C.

Rife, Jason H., Pullen, Samuel P       
The Impact of Measurement Biases on Availability for CAT III LAAS       
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, Massachusetts.

Rife, Jason H., Pullen, Samuel P., Walter, Todd, and Enge, Per K       
Vertical Protectiion Levels for a Local Airport Monitor for WAAS       
Presented June 2005 at the Institute of Navigation's Annual Meeting, Cambridge, Massachusetts.

Sparks, L., Komjathy, A., Mannucci, A.J., Altshuler, E., Walter T., Blanch, J., El-Arini M. B., and Lejeune, R.       
Extreme Ionospheric Storms and Their Impact on WAAS       
In Proceedings of the ionospheric Effects Symposium, Alexandria, VA, May 2005

Walter, Todd, Pullen, Samuel P., Rife, Jason H., Seo, Jiwon, and Enge, Per K       
The Advantages of Local Monitoring and VHF Data Broadcast for SBAS       
Presented July 2005 at the European Navigation Conference GNSS 2005, Munich, Germany.

Alban, Santiago       
Design and Performance of a Robust GPS/INS Attitude System for Automobile Applications       
Ph.D. Dissertation, Stanford University, June 2004

Blanch, Juan A., et. al       
A New Ionospheric Estimation Algorithm for SBAS Combining Kriging and Tomography       
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Ionospheric Estimation using Extended Kriging for a low latitude SBAS       
Presented September 2004 at the Institute of Navigation GNSS Conference, Long Beach, California.

Carroll, Kevin M., Hawes, Anthony, Peterson, Benjamin B., Dykstra, Kenneth, Swaszek, Peter and Lo, Sherman C       
Differential Loran-C       
Presented May 2004 at the European Navigation Conference - GNSS 2004, Rotterdam, The Netherlands.

Chiou, Tsung-Yu, Alban, Santiago, Atwater, Sarah, Gautier, Jennifer D., Pullen, Samuel P., Enge, Per K., Akos, Dennis M., Gebre-Egziabher, Demoz, and Pervan, Boris S       
Performance Analysis and Experimental Validation of a Doppler-Aided GPS/INS Receiver for JPALS Applications       
Presented September 2004 at the Institute of Navigation's GNSS Meeting, Long Beach, California.

Datta-Barua, Seebany       
Ionospheric Threats to Space-Based Augmentation System Development       
Presented September 2004 at the Institute of Navigation's GNSS Meeting, Long Beach, California.

De Lorenzo, David S., Alban, Santiago, Gautier, Jennifer D., Enge, Per K., and Akos, Dennis M       
GPS Attitude Determination for a JPALS Testbed: Integer Initialization and Testing       
Presented April 2004 at the IEEE Position Location and Navigation Symposium, Monterey, California.

De Lorenzo, David S., Gautier, Jennifer D., Enge, Per K., and Akos, Dennis M       
GPS Receiver Architecture Effects on Controlled Reception Pattern Antennas for JPALS       
Presented September 2004 at the Institute of Navigation's GNSS Conference, Long Beach, California. *Best Presentation Award

Do, Juyong, Akos, Dennis M., and Enge, Per K       
L and S Bands Spectrum Survey in the San Francisco Bay Area       
Presented April 2004 at the IEEE Position Location and Navigation Symposium, Monterey, California.

Enge, Per       
Retooling the Global Positioning System       
Published in Scientific American May 2004.

Heo, Moon-Beom, Pervan, Boris, Pullen, Sam, Gautier, Jennifer, Enge, Per, and Gebre-Egziabher, Demoz       
Autonomous Fault Detection with Carrier-Phase DGPS for Shipboard Landing Navigation        
Published in NAVIGATION , Vol. 51, No. 3, Fall 2004, pp. 185-198.

Kim, Ung Souk, De Lorenzo, David S., Gautier, Jennifer D., Enge, Per K., Akos, Dennis M., and Orr, John       
Precise Phase Calibration of a Controlled Reception Pattern GPS Antenna for JPALS       
Presented April 2004 at the IEEE Position Location and Navigation Symposium, Monterey, California.

Kim, Ung-Souk, De Lorenzo, David S., Gautier, Jennifer D., Enge, Per K., and Orr, John A       
Phase Effects Analysis of Patch Antenna CRPAs for JPALS       
Presented September 2004 at the Institute of Navigation GNSS Conference in Long Beach, California.

Lee, Jiyun       
LAAS Position Domain Monitor Analysis and Test Results for CAT II/III Operations       
Presented September 2004 at the Institute of Navigation GNSS Conference, Long Beach, California.

Lo, Sherman C., et. al       
Loran Availability and Continuity Analysis for Required Navigation Performance 0.3       
Presented May 2004 at the European Navigation Conference - GNSS 2004, Rotterdam, The Netherlands.

Lo, Sherman C., et. al.       
Loran Integrity Analysis for Required Navigation Performance 0.3       
Presented June 2004 at the 5^th International Symposium on Integration of LORAN-C/Eurofix and EGNOS/Galileo, Munich, Germany.

Lo, Sherman C., et. al.       
Overview of the Safety Analysis of Loran for Aviation       
Presented June 2004 at the Institute of Navigation Annual Meeting, Dayton, Ohio.

Luo, Ming, Pullen, Samuel P., Walter, Todd, and Enge, Per K       
Ionosphere Spatial Gradient Threat for LAAS: Mitigation and Tolerable Threat Space       
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Luo, Ming, Pullen, Samuel P., Ene, Alexander, Qiu, Diu, Walter, Todd, and Enge, Per K       
Ionosphere Threat to LAAS: Updated Model, User Impact, and Mitigations       
Presented September 2004 at the Institute of Navigation GNSS Conference, Long Beach, California.

Mitelman, Alexander       
Signal quality monitoring for GPS augmentation systems (zipped)       
Signal quality monitoring for GPS augmentation systems]       
Ph.D. Dissertation, Stanford University, December 2004

Mitelman, Alexander M., Phelts R. Eric, Akos, Dennis M., Pullen, Samuel P., and Enge, Per K       
Signal Deformations On Nominally Healthy GPS Satellites       
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Phelts, R. Eric, Walter, Todd, and Enge, Per K       
Range Biases on the WAAS Geostationary Satellites       
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Phelts, R. Eric, and Akos, Dennis M       
Nominal Signal Deformations: Limits on GPS Range Accuracy       
Presented December 2004 at the International Symposium on GNSS/GPS in Sydney, Australia.

Pullen, Sam and Enge, Per K       
A Civil User Perspective on Near-Term and Long-Term GPS Modernization       
Proceedings of Japan GPS/GNSS Symposium 2004,  Tokyo, Japan, November 17-19, 2004.

Rajagopal, Sriram, et. al       
Correlation Structure of the Equatorial Ionosphere       
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Rife, Jason H., Pullen, Samuel P., Pervan, Boris S., Enge, Per K       
Paired Overbounding and Application to GPS Augmentation       
Presented April 2004 at the IEEE Position Location and Navigation Symposium, Monterey, California.

Rife, Jason H., Pullen, Samuel P., and Pervan, Boris S.

Core Overbounding and its Implications for LAAS Integrity       
Presented September 2004 at the Institute of Navigation GNSS Conference in Long Beach, California.

Rife, Jason H., Walter, Todd, and Blanch, Juan A       
Overbounding SBAS and GBAS Error Distributions with Excess-Mass Functions       
Presented December 2004 at the International Symposium on GNSS/GPS in Sydney, Australia.

Walter, Todd, Datta-Barua, Seebany, Blanch, Juan A., and Enge, Per K       
The Effects of Large Ionospheric Gradients on Single Frequency Airborne Smoothing Filters for WAAS and LAAS       
Presented January 2004 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Walter, Todd, Enge, Per K., and Reddan, Pat       
Modernizing WAAS       
Presented September 2004 at the Institute of Navigation's GNSS Meeting, Long Beach, California.

Walter, Todd, Rajagopal, Sriram, Datta-Barua, Seebany, and Blanch, Juan A       
Protecting Against Unsampled Ionospheric Threats       
Presented October 2004 at the Beacon Satellite Symposium, Trieste, Italy.

Walter, Todd, Blanch, Juan A., and Rife, Jason H       
Treatment of Biased Error Distributions in SBAS       
Presented December 2004 at the International Symposium on GNSS/GPS in Sydney, Australia.

Xie, Gang       
Optimal On-Airport Monitoring of the Integrity of GPS-Based Landing Systems       
Ph.D. Dissertation, Stanford University, March 2004.

Akos, Dennis M., et. al       
A Prototyping Platform for Multi-Frequency GNSS Receivers       
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, Oregon. *Best Presentation Award

Alban, Santiago, Akos, Dennis M., Rock, Stephen M., and Gebre-Egziabher, Demoz       
Performance Analysis and Architectures for INS-Aided GPS Tracking Loops       
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, California.

Bauregger, Frank       
Novel anti-jam antennas for airborne GPS navigation       
Ph.D. Dissertation, Stanford University, August 2003

Blanch, Juan       
Using Kriging to bound Satellite Ranging Errors due to the Ionosphere       
Ph.D. Dissertation, Stanford University, December 2003

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Adapting Kriging to the WAAS MOPS Ionospheric Grid       
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, California.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Measurement Noise versus Process Noise in Ionosphere Estimation for WAAS       
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, California.

Boyce, Lee, et. al       
A Time Domain Atmospheric Noise Level Analysis       
Presented November 2003 at the International Loran Association 32nd Annual Meeting, 2003, Boulder, Colorado.

Datta-Barua, Seebany, Doherty, Patrick, Delay, Susan, Dehel, Thomas and Klobuchar,John       
Ionospheric Scintillation Effects on Single and Dual Frequency GPS Positioning       
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, Oregon.

Enge, Per K       
GPS Modernization: Capabilities of the New Civil Signals       
Presented 29 July – 1 August 2003 at the Australian International Aerospace Congress, Brisbane, Australia.

Gautier, Jennifer D       
GPS/INS Generalized Evaluation Tool (GIGET) for the Design and Testing of Integrated Navigation Systems       
Ph.D. Dissertation, Stanford University, June 2003.

Gebre-Egziabher, Demoz, Jr., C. O. Lee Boyce, Powell, J. David, and Enge, Per       
An Inexpensive DME-Aided Dead Reckoning Navigator       
Published in NAVIGATION , Vol. 50, No. 4, Winter 2003-2004, pp. 247-264.

Holforty, Wendy       
Flight-deck display of neighboring aircraft wake vortices       
Ph.D. Dissertation, Stanford University, June 2003

Jan, Shau-Shiun, Walter, Todd, and Enge, Per K       
Techniques for Graceful Reversion from Dual to Single Frequency WAAS       
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, California.

Jan, Shau-Shiun       
Aircraft Landing Using a Modernized Global Positioning System and the Wide Area Augmentation System       
Ph.D. Dissertation, Stanford University, May 2003.

Jardin, Matthew Robert       
Toward real-time en route air traffic control optimization       
Ph.D. Dissertation, Stanford University, March 2003

Jennings, Chad       
Threat Displays for Final Approach       
Ph.D. Dissertation, Stanford University, May 2003

Lo, Sherman C., et. al       
Loran Fault Trees for Required Navigation Performance 0.3       
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, California.

Lo, Sherman C., et. al       
Loran for Required Navigation Performance 0.3: The Current Work of the Loran Integrity Performance Panel (LORIPP)       
Presented April 2003 at the European Navigation Conference - Global Navigation Satellite Systems (ENC GNSS), Graz, Austria.

Lo, Sherman C., et. al       
Loran for RNP 0.3 Approach: The Preliminary Conclusions of Loran Integrity Performance Panel (LORIPP)       
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, Oregon.

Lo, Sherman C., et. al       
Analysis of the Effects of ASF Variations for Loran RNP 0.3       
Presented November 2003 at the International Loran Association 32nd Annual Meeting, 2003, Boulder, Colorado.

Luo, Ming, Xie, Gang, Akos, Dennis M., Pullen, Samuel P., and Enge, Per K       
Radio Frequency Interference Validation Testing for LAAS using the Stanford Integrity Monitor Testbed       
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, California.

Luo, Ming, et. al       
LAAS Ionosphere Spatial Gradient Threat Model and Impact of LGF and Airborne Monitoring       
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, Oregon.

Opshaug, Guttorm       
A Leapfrog Navigation System       
Ph.D. Dissertation, Stanford University, May 2003.

Pervan, Boris, Chan, Fang-Cheng, Gebre-Egziabher, Demoz, Pullen, Sam, Enge, Per, and Colby, Glenn       
Performance Analysis of Carrier-Phase DGPS Navigation for Shipboard Landing of Aircraft       
Published in NAVIGATION Vol. 50, No. 3, Fall 2003, pp. 181-192.

Phelts, R. Eric, Walter, Todd, and Enge, Per K       
Toward Real-Time SQM for WAAS: Improved Detection Techniques       
Presented September 2003 at the Institute of Navigation's GPS/GNSS Meeting, Portland, Oregon.

Phelts, R. Eric, et. al       
Practical Signal Quality Monitoring for Augmentation Systems       
Presented November 2003 at the International Symposium on GNSS, Tokyo, Japan.

Rife, Jason       
Automatic Robotic Tracking of Gelatinous Animals in the Deep Ocean       
Ph.D. Dissertation, Stanford University, December 2003

Walter, Todd, Enge, Per K., and DeCleene, Bruce       
Integrity Lessons from the WAAS Integrity Performance Panel (WIPP)       
Presented January 2003 at the Institute of Navigation's National Technical Meeting, Anaheim, California.

Alban, Santiago       
An Inexpensive and Robust GPS/INS Attitude System for Automobiles       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Bauregger, Frank N., Walter, Todd, Akos, Dennis M., and Enge, Per K       
A Novel Dual-Patch Anti-Jam GPS Antenna       
Presented June 2002 at the Institute of Navigation's Annual Meeting, Albuquerque, New Mexico.

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Application of Spatial Statistics to Ionosphere Estimation for WAAS       
Presented January 2002 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Blanch, Juan, Walter, Todd, and Enge Per       
Ionospheric Threat Model Methodology for WAAS       
Published in NAVIGATION , Vol. 49, No. 2, Summer 2002, pp. 103-107, DOI 10.1002/j.2161-4296.2002.tb00259.x

Blanch, Juan A       
An Ionospheric Estimation Algorithm for WAAS Based on Kriging       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Datta-Barua, Seebany, Walter, Todd, Pullen, Samuel P., Luo, Ming, Blanch, Juan and Enge, Per K       
Using WAAS Ionospheric Data to Estimate LAAS Short Baseline Gradients       
Presented January 2002 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Gromov, Konstantin       
GIDL: Generalized Interference Detection and Localization System       
Ph.D. Dissertation, Stanford University, March 2002

Hansen, Andrew J       
Tomographic Estimation of the Ionosphere Using Terrestrial GPS Sensors       
Ph.D. Dissertation, March 2002.

Jan, Shau-Shiun, Gebre-Egziabher, Demoz, Walter, Todd, and Enge, Per K       
Worst-Case Analysis of a 3-Frequency Receiver to Land a General Aviation Airplane       
Presented January 2002 at the Institute of Navigation's National Technical Meeting, San Diego, California.

Jan, Shau-Shiun       
Analysis of a Three-Frequency GPS/WAAS Receiver to Land an Airplane       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Jennings, Chad W., Charafeddine, Mohamad, Powell, J. David, and Taamallah, Skander       
Flight Demonstration of 3D Perspective Synthetic Vision and ADS-B for Closely Spaced Parallel Approaches       
Presented 2002 at the Proceedings of the 21^st Digital Avionics Systems Conference, Irvine, California.

Jennings, Chad W., Powell, J. David       
Flight Test Measurement of Pilot Reaction Times to Runway Incursions: Out-the-Window vs. Synthetic Vision       
Presented Proceedings of the 21^st Digital Avionics Systems Conference, Irvine, California. 2002.

Koenig, Michael, Gebre-Egziabher, Demoz, Pullen, Samuel P., Kim, Ung-Souk, Enge, Per K., Pervan, Boris S., Chan, Fang Cheng, and Colby, Glenn       
Sensitivity Analysis of the JPALS Shipboard Relative GPS Measurement Quality Monitor       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Lo, Sherman C., et. al       
WAAS Performance in the 2001 Alaska Flight Trials of the High Speed Loran Data Channel       
Presented April 2002 at the IEEE Position Location and Navigation Symposium, Palm Springs, California.

Lo, Sherman C       
Broadcasting GPS Integrity Information Using Loran-C       
Ph.D. Dissertation, July 2002.

Lo, Sherman C., et. al       
The Loran Integrity Performance Panel       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Lo, Sherman C., et. al       
The Loran Integrity Performance Panel (LORIPP)       
Presented October 2002 at the International Loran Association 31^st Annual Meeting, 2002, Washington, D.C.

Luo, Ming, Pullen, Samuel P., Akos, Dennis M., Xie, Gang, Datta-Barua, Seebany, Walter, Todd, and Enge, Per K       
Assessment of Ionospheric Impact on LAAS Using WAAS Supertruth Data       
Presented June 2002 at the Institute of Navigation's Annual Meeting, Albuquerque, New Mexico.

Mitelman, Alexander M., Akos, Dennis M., Pullen, Samuel P., and Enge, Per K       
Estimation of ICAO Threat Model Parameters For Operational GPS Satellites       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Normark, Per-Ludvig, Akos, Dennis M., Xie, Gang, Pullen, Samuel P., Luo, Ming, and Enge, Per K       
The Integrity Monitor Testbed and Multipath Limiting Antenna Test Results       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Opshaug, Guttorm and Enge, Per K       
Integrated GPS and UWB Navigation System       
Presented May 2002 at the IEEE UWB Science and Technology (UWBST) Conference, Baltimore, Maryland.

Opshaug, Guttorm       
Leapfrog Navigation System       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Peterson, Benjamin B., Enge, Per K., Walter, Todd, Lo, Sherman C., Boyce, C. O. Lee, Wenzel, Robert and Narins, Mitchell J       
Hazardously Misleading Information Analysis for Loran LNAV       
Presented June 2002 at the 3^rd International Symposium on Integration of LORAN-C/Eurofix and EGNOS/Galileo, Munich, Germany.

Pullen, Samuel P., Luo, Ming, Xie, Gang, Lee, Jiyun, Phelts, R. Eric, Akos, Dennis M., and Enge, Per K       
LAAS Ground Facility Design Improvements to Meet Proposed Requirements for Category II/III Operations       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Pullen, Samuel P., Walter, Todd, and Enge, Per K       
System Overview, Recent Developments, and Future Outlook for WAAS and LAAS       
Presented November 11 - 13, 2002, Tokyo University of Mercantile Marine GPS Symposium, Tokyo, Japan.

Schloss, Peter, Phelts, R. Eric, Walter, Todd, and Enge, Per K       
A Simple Method of Signal Quality Monitoring for WAAS LNAV/VNAV       
Presented September 2002 at the Institute of Navigation's GPS Meeting, Portland, Oregon.

Bauregger, Frank N., Walter, Todd, and Enge, Per K       
The Dielectric Cavity Antenna - An Alternative to the Choke Ring Antenna       
Presented January 2001 at the ION National Technical Meeting, Long Beach, California.

Bevly, David       
High speed, dead reckoning, and towed implement control for automatically steered farm tractors using GPS       
Ph.D. Dissertation, Stanford University, August 2001

Blanch, Juan A., Walter, Todd, and Enge, Per K       
Ionospheric Threat Model Methodology for WAAS       
Presented June 2001 at the Institute of Navigation's Annual Meeting, Albuquerque, New Mexico.

Dai, Donghai       
Interoperability of Space Based Augmentation Systems for Aircraft Navigation       
Ph.D. Dissertation, Stanford University, April 2001

Elkaim, Gabriel H. and Parkinson, Bradford W       
System Identification for Precision Control of a GPS-Autonomous Catamaran       
Presented May 2001 at the International Conference on Integrated Navigation Systems, St. Petersburg, Russia.

Elkaim, Gabriel H       
System Identification for Precision Control of a Wingsailed GPS-Guided Catamaran       
Ph.D. Dissertation, Stanford University, December 2001.

Enge, Per K., Fan, Rod, Tiwari, Anil, Chou, Andrew, Mann, Wallace, Sahai, Anant, Stone, Jesse, and Van Roy, Ben       
Improving GPS Coverage and Continuity: Indoors and Downtown       
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, Utah.

Gebre-Egziahber, Demoz       
Design and Performance Analysis of a Low-Cost Aided Dead Reckoning Navigator       
Ph.D. Dissertation, Stanford University, December 2001

Gebre-Egziabher, Demos, Powell, J. David, and Enge, Per K       
Design and Performance Analysis of a Low-Cost Aided Dead Reckoning Navigation System       
Presented May 2001 at the International Conference on Integrated Navigation Systems, St. Petersburg, Russia.

Gebre-Egziabher, Demoz, Elkaim, Gabriel H., Powell, J. David, and Parkinson, Bradford W       
A Non-Linear, Two-Step Estimation Algorithm For Calibrating Solid-State Strapdown Magnetometers       
Presented May 2001 at the International Conference on Integrated Navigation Systems, St. Petersburg, Russia.

Holforty, Wendy L. and Powell, J. David       
Flight Deck Display of Airborne Traffic Wake Vortices       
Presented 14-18 October 2001 20^th DASC Conference, Daytona Beach, Florida.

Houck, Sharon W       
Multi Aircraft Dynamics, Navigation and Operation       
Ph.D. Dissertation, April 2001.

Houck, Sharon W. and Powell, J. David       
Assessment of the Probability of a Midair Collision During an Ultra Closely Spaced Parallel Approach       
Presented August 2001 at the AIAA Guidance, Navigation and Control Conference, Montreal, Canada.

Jan, Shau-Shiun and Enge, Per K       
Finding Source of Electromagnetic Interference (EMI) to GPS Using a Network of Sensors       
Presented January 2001 at the ION National Technical Meeting, Long Beach, California.

Jan, Shau-Shiun, Chan, Wyant, Walter, Todd, and Enge, Per K       
Matlab Simulation Toolset for SBAS Availability Analysis       
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, Utah.

Lee, Jiyun, Pullen, Samuel P., Xie, Gang, and Enge, Per K       
LAAS Sigma-Mean Monitor Analysis and Failure-Test Verification       
Presented June 2001 at the Institute of Navigation's Annual Meeting, Albuquerque, New Mexico.

LeMaster, Edward A. and Rock, Stephen M       
A Local-Area GPS Pseudolite-Based Mars Navigation System       
Presented August 2001 at the IEEE 10th International Conference on Advanced Robotics, Budapest, Hungary.

Lo, Sherman C. and Enge, Per K       
Analysis of the Enhanced LORAN Data Channel       
Presented February 2001 at the German Institute of Navigation conference, Bonn, Germany.

Luo, Ming, Akos, Dennis M., Koenig, Michael, Opshaug, Guttorm, Pullen, Samuel P., Enge, Per K., Erlandson, Bob, and Frodge, Sally       
Testing and Research on Interference to GPS from UWB Transmitters       
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, Utah. *Best Presentation Award

Normark, Per-Ludvig, Xie, Gang, Akos, Dennis M., Pullen, Samuel P., Luo, Ming, Lee, Jiyun, and Enge, Per K       
The Next Generation Integrity Monitor Testbed (IMT) for Ground System Development and Validation Testing       
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, Utah.

Opshaug, Guttorm and Enge, Per K       
GPS and UWB for indoor navigation       
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, Utah.

Phelts, R. Eric       
Multicorrelator Techniques for Robust Mitigation of Threats to GPS Signal Quality       
Ph.D. Dissertation, June 2001.

Phelts, R. Eric, Mitelman, Alexander M., Pullen, Samuel P., Akos, Dennis M., and Enge, Per K       
Transient Performance Analysis of a Multicorrelator Signal Quality Monitor       
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, Utah. *Best Presentation Award

Pullen, Samuel P., Lee, Jiyun, Luo, Ming, Pervan, Boris S., Chan, Fang-Chen, and Gratton, Livio       
Ephemeris Protection Level Equations and Monitor Algorithms for GBAS       
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, Utah.

Rekow, Andrew       
System identification, adaptive control and formation driving of farm tractors       
Ph.D. Dissertation, Stanford University, March 2001

Vidarsson, Logi, Pullen, Samuel P., Green, Gaylord, and Enge, Per K       
Satellite Autonomous Integrity Monitoring and its Role in Enhancing GPS User Performance       
Presented September 2001 at the Institute of Navigation's GPS Conference, Salt Lake City, Utah.

Walter, Todd, Hansen, Andrew J., and Enge, Per K       
Message Type 28       
Presented January 2001 at the ION National Technical Meeting, Long Beach, California.

Walter, Todd, Hansen, Andrew, Blanch, Juan, Enge, Per, Mannucci, Tony, Pi, Xiaoqing, Sparks, Larry, Iijima, Byron, El-Arini, Bakry, Lejeune, Roland, Hagen, Mine, Altshuler, Eric, Fries, Rob, and Chu, Aleck       
Robust Detection of Ionospheric Irregularities       
Published in NAVIGATION , Vol. 48, No. 2, Summer 2001, pp. 89-100, DOI 10.1002/j.2161-4296.2001.tb00231.x

Xie, Gang, Pullen, Samuel P., Luo, Ming, Normark, Per-Ludvig, Akos, Dennis M., Lee, Jiyun, Enge, Per K., and Pervan, Boris S       
Integrity Design and Updated Test Results for the Stanford LAAS Integrity Monitor Testbed       
Presented June 2001 at the Institute of Navigation's Annual Meeting, Albuquerque, New Mexico.

Akos, Dennis M., Normark, Per-Ludvig, Lee, Jeong-Tack, Gromov, Konstatin, Tsui, James B. Y., and Schamus, John       
Low Power Global Navigation Satellite System (GNSS) Signal Detection and Processing       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Alter, Keith       
Using wide area differential GPS to improve total system error for precision flight operations       
Ph.D. Dissertation, Stanford University, December 2000

Barrows, Andrew       
GPS 3-D cockpit displays: Sensors, Algorithms, and Flight Testing       
Ph.D. Dissertation, Stanford University, May 2000

Barrows, Andrew K. and Powell, J. David       
Flying a Tunnel-in-the-Sky Display Within the Current Airspace System       
Presented January 2000 at the AIAA 38th Aerospace Sciences Meeting, Reno, Nevada.

Fuller, Richard A       
Aviation Utilization of Geostationary Satellites for the Augmentation of GPS: Ranging and Data Link       
Ph.D. Dissertation, Stanford University, May 2000.

Fuller, Richard A., Walter, Todd, and Enge, Per K       
Burst Mode Message Loss Effects On WAAS Availability       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Gebre-Egziabher, Demoz, and Powell, J. David       
A DME Based Area Navigation System for GPS/WAAS Interference Mitigation In General Aviation Applications        
Presented March 2000 at the IEEE PLANS conference, San Diego, California.

Gebre-Egziabher, Demoz, Elkaim, Gabriel H., and Powell, J. David       
A Gyro-Free Quaternion-Based Attitude Determination System Suitable for Implementation Using Low Cost Sensors       
Presented March 2000 at the IEEE PLANS conference, San Diego, California.

Gromov, Konstantin, Akos, Dennis M., Pullen, Samuel P., Enge, Per K. and Parkinson, Bradford W       
GIDL: Generalized Interference Detection and Localization System       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Hansen, Andrew J., Peterson, Eric, Walter, Todd, and Enge, Per K       
Correlation Structure of Ionospheric Estimation and Correlation for WAAS       
Presented January 2000 at the Institute of Navigation's NTM, Anaheim, California.

Hansen, Andrew J., Blanch, Juan A., Walter, Todd, and Enge, Per K       
Ionospheric Correlation Analysis for WAAS: Quiet and Stormy       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Houck, Sharon W. and Powell, J. David       
Visual, Cruise Formation Flying Dynamics       
Presented August 2000 at the AIAA Atmoshpheric Flight Mechanics conference, Denver, Colorado.

Houck, Sharon W. and Powell, J. David       
A Parametric Sensitivity Study of Ultra Closely Spaced Parallel Approaches       
Presented October 2000 at the Digital Avionics Systems Conference, Philadelphia, Pennsylvania.

Jan, James Shau-Shiun and Enge, Per K       
Using GPS to Synthesize A Large Antenna Aperture When the Elements Are Mobile       
Presented January 2000 at ION NTM, Anaheim, California.

Jennings, Chad and Powell, J. David       
Synthetic Vision Displays for Instrument Landings and Traffic Awareness - Development and Flight Testing       
Presented October 2000 at the Digital Avionics Systems Conference, Philadelphia, Pennsylvania.

Jung, Jaewoo       
High integrity carrier phase navigation using multiple civil GPS signals       
Ph.D. Dissertation, Stanford University, August 2000

Jung, Jaewoo, Enge, Per K., and Pervan, Boris       
Optimization of Cascade Integer Resolution with Three Civil GPS Frequencies       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Ko, Ping-Ya       
GPS-based precision approach landing navigation       
Ph.D. Dissertation, Stanford University, May 2000

LeMaster, Edward A. and Rock, Stephen M       
Field Test Results for a Self-Calibrating Pseudolite Array        
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Lo, Sherman C. and Enge, Per K       
Broadcasting Data from an SBAS Reference Network over Low Rate Broadcast Channels       
Presented March 2000 at the German Institute of Navigation conference, Bonn, Germany.

Lo, Sherman C. and Enge, Per K       
Broadcasting Data from an SBAS Reference Network over using LORAN        
Presented June 2000 at the Institute of Navigation's Annual Meeting, San Diego, California.

Lo, Sherman C. and Enge, Per K       
Data Transmission Using LORAN-C       
Presented November 2000 at the 29^th Annual Convention and Technical Symposium of the International Loran Association, Washington, D.C.

Luo, Ming, Akos, Dennis M., Pullen, Samuel P., and Enge, Per K       
Interference to GPS from UWB Transmitters       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah. *Best Presentation Award

Mitelman, Alexander M., Phelts, R. Eric, Akos, Dennis M., Pullen, Sam and Enge, Per K       
A Real-Time Signal Quality Monitor for GPS Augmentation Systems       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah. *Best Presentation Award

Nichols, Jonathan, Hansen, Andrew , Walter, Todd, and Enge, Per       
High-Latitude Measurements of Ionospheric Scintillation Using the NSTB       
Published in NAVIGATION , Vol. 47, No. 2, Summer 2000, pp. 112-120, DOI 10.1002/j.2161-4296.2000.tb00206.x

Opshaug, Guttorm and Enge, Per K       
Robotic snow cat       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah. *Best Presentation Award

Phelts, R. Eric and Enge, Per K       
The Case for Narrowband Receivers       
Presented January 2000 at Institute of Navigation's National Technical Meeting, Anaheim, California.

Phelts, R. Eric and Enge, Per K       
Multipath Mitigation for Narrowband Receivers       
Presented March 2000 at the IEEE PLANS conference, San Diego, California.

Phelts, R. Eric and Enge, Per K       
The Multipath Invariance Approach for Code Multipath Mitigation       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah. *Best Presentation Award

Phelts, R. Eric, Akos, Dennis and Enge, Per K       
Robust Signal Quality Monitoring and Detection of Evil Waveforms       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Rabinowitz, Matthew       
A differential carrier-phase navigation system combining GPS with low Earth orbit satellites for rapid resolution of integer cycle ambiguities       
Ph.D. Dissertation, Stanford University, December 2000

Rabinowitz, Matthew, Parkinson, Bradford W., Gromov, Konstantin, and Cohen, Clark E       
Architectures for Joint GPS/LEO Satellite Carrier Phase Receivers Designed for Rapid Robust Resolution of Carrier Cycle Ambiguities on Mobile Platorms       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Rabinowitz, Matthew, Parkinson, Bradford W., and Spilker, James J       
Some Capabilities of a Joint GPS-LEO Navigation System       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah.

Walter, Todd, Hansen, Andrew J., Blanch, Juan A. and Enge, Per K       
Robust Detection of Ionospheric Irregularities       
Presented September 2000 at the Institute of Navigation's GPS conference, Salt Lake City, Utah. *Best Presentation Award

Abbott, Eric C. and Powell, J. David       
Land-vehicle Navigation Using GPS       
The Proceedings of the IEEE January 1999, Vol. 87, no 1, pp 145-162.

Barrows, Andrew K., Alter, Keith W., Jennings, Chad W., and Powell, J. David       
Alaskan Flight Trials of a Synthetic Vision System for Instrument Landings of a Piston Twin Aircraft       
Presented April 1999 at the SPIE Enhanced and Synthetic Vision conference, Orlando, Florida.

Barrows, Andrew K. and Powell, J. David       
Tunnel-in-the-Sky Cockpit Display for Complex Remote Sensing Flight Trajectories       
Presented June 1999 at the Airborne Remote Sensing conference, Ottawa, Canada.

Bell, Thomas       
Precision robotic control of agricultural vehicles on realistic farm trajectories       
Ph.D. Dissertation, Stanford University, June 1999

Christie, Jock R. I., Ko, Ping-Ya , Hansen, Andrew J., Dai, Donghai, Pullen, Samuel P., Pervan, Boris S. and Parkinson, Bradford W       
The Effects of Local Ionospheric Decorrelation on LAAS: Theory and Experimental Results       
Presented January 1999 at ION National Technical Meeting, San Diego, California.

Enge, Per and Misra, Pratap       
Special Issue on Global Positioning System       
Published in Proceedings of the IEEE, Vol. 87, No 1, pp.3 - 15, 1999

Enge, Per       
Local area augmentation of GPS for the precision approach of aircraft       
Published in Proceedings of the IEEE, Vol. 87, No 1, pp.111 - 132, DOI: 10.1109/5.736345, 1999

Enge, Per, Phelts, Eric, and Mitelman, Alexander       
Detecting Anomalous Signals from GPS Satellites       
Figures for: Detecting Anomalous Signals from GPS Satellites       
Unpublished draft paper October 12, 1999

Fuller, Richard A., Walter, Todd, Houck, Sharon W., and Enge, Per K       
Flight Trials of a Geostationary Satellite Based Augmentation System at High Latitudes and for Dual Satellite Coverage       
Presented January 1999 at ION National Technical Meeting, San Diego, California.

Gebre-Egziabher, Demoz, Lo, Sherman C., Powell, J. David and Enge, Per K       
GPS Supplemental Navigation Systems for Use During the Transition to a Sole-Means-GPS National Airspace System       
Presented January 1999 at ION National Technical Meeting, San Diego, California.

Gromov, Konstantin, Akos, Dennis M., Pullen, Samuel P., Enge, Per K., Parkinson, Bradford W., and Pervan, Boris S       
Interference Direction Finding for Aviation Applications of GPS       
Presented September 1999 at the Institute of Navigation's GPS conference, Nashville, Tennessee.

Hayward, Roger C., Marchick, Adam, and Powell, J. David       
Single Baseline GPS Based Attitude Heading Reference System (AHRS) for Aircraft Applications       
Presented June 1999 at the IEEE American Control Conference, San Diego, California.

Houck, Sharon W., Barrows, Andrew K., Parkinson, Bradford W., Enge, Per K., and Powell, J. David       
Flight Testing WAAS for Use in Closely Spaced Parallel Approaches       
Presented September 1999 at the ION GPS conference, Nashville, Tennessee.

Jennings, Chad W., Alter, Keith W., Barrows, Andrew K., Enge, Per K., and Powell, J. David       
3-D Perspective Displays for Guidance and Traffic Awareness       
Presented September 1999 at the ION GPS conference, Nashville, Tennessee.

Jung, Jaewoo       
High Integrity Carrier Phase Navigation for Future LAAS Using Multiple Civilian GPS Signals       
Presented September 1999 at the Institute of Navigation's GPS conference, Nashville, Tennessee.

LeMaster, Edward A., and Rock, Stephen M       
Self-Calibration of Pseudolite Arrays Using Self-Differencing Transceivers       
Presented September 1999 at the ION GPS conference, Nashville, Tennessee.

Li, Jie, Ndili, Awele, Ward, Lisa and Buchman, Saps       
GPS Receiver Satellite/Antenna Selection Algorithm for the Stanford Gravity Probe B Relativity Mission       
Presented January 1999 at ION National Technical Meeting, San Diego, California.

Mitelman, Alexander M., Jung, Jaewoo, and Enge, Per K       
LAAS Monitoring For A Most Evil Satellite Failure       
Presented January 1999 at ION National Technical Meeting, San Diego, California.

Olsen, Eric       
GPS sensing for formation flying vehicles       
Ph.D. Dissertation, Stanford University, November 1999

Phelts, R. Eric, Stone, Jonathan M., Enge, Per K., and Powell, J. David       
Software-based Multipath Mitigation: Sampling for Multipath Invariance       
Presented July 1999 at the 4^th International Symposium on Satellite Navigation Technology and Applications, Brisbane, Australia.

Stone, Jonathan M., LeMaster, Edward A., Powell, J. David and Rock, Stephen M       
GPS Pseudolite Transceivers and their Applications        
Presented January 1999 at ION National Technical Meeting, San Diego, California.

Tsai, Yeou-Jyh       
Wide Area Differential Operation of the Global Positioning System: Ephemeris and Clock Operations       
Ph.D. Dissertation, Stanford University, August 1999

Walter, Todd F       
WAAS MOPS: Practical Examples       
Presented January 1999 at ION National Technical Meeting, San Diego, California.

Walter, Todd, Hansen, Andrew J., and Enge, Per K       
Validation of the WAAS MOPS Integrity Equation       
Presented June 1999 at ION Annual Meeting, Cambridge, Massachusetts.

Christie, Jock R. I., Ko, Ping-Ya, Pervan, Boris S., Enge, Per K., Powell, J. David and Parkinson, Bradford W       
Analytical and Experimental Observations of Ionospheric and Tropospheric Decorrelation Effects for Differential Satellite Navigation during Precision Approach       
Presented September 1998 at ION GPS Conference, Nashville, Tennessee.

Fuller, Richard A., Dai, Donghai, Walter, Todd, Comp, Christopher J., Enge, Per K., and Powell, J. David       
Interoperation and Integration of Satellite Based Augmentation Systems       
Presented September 1998 at ION GPS '98, Nashville, Tennessee.

Gebre-Egziabher, Demoz, Hayward, Roger C., and Powell, J. David       
A Low-Cost GPS/Inertial Attitude Heading Reference System (AHRS) for General Aviation Applications       
Presented April 1998 at the 1998 IEEE Position, Location and Navigation Symposium - PLANS '98, Palm Springs, California.

Hayward, Roger C., Gebre-Egziabher, Demoz, and Powell, J. David       
GPS-Based Attitude for Aircraft       
Presented May 1998 at International Conference on Integrated Navigation Systems in St. Petersburg, Russia.

Hayward, Roger C. and Powell, J. David       
Real Time Calibration of Antenna Phase Errors for Ultra Short Baseline Attitude Systems       
Presented September 1998 at ION GPS '98 - Nashville, Tennessee.

LeMaster, Edward A. and Rock, Stephen M       
Mars Exploration Using Self-Calibrating Pseudolite Arrays       
Presented September 1998 at the ION GPS Conference, Nashville, Tennessee.

Ndili, Awele       
Robust GPS Autonomous Signal Quality Monitoring       
Ph.D. Dissertation, Stanford University, August 1998

Ndili, Awele and Enge, Per K       
GPS Receiver Autonomous Interference Detection       
Presented April 1998 at the IEEE Position, Location and Navigation Symposium - PLANS '98, Palm Springs, California.

Pervan, Boris, Lawrence, David, Gromov, Konstantin, Opshaug, Guttorm, Christie, Jock, Ko, Ping-Ya, Mitelman, Alexander, Pullen, Sam, Enge, Per, and Parkinson, Bradford       
Flight Test Evaluation of an Alternative Local Area Augmentation System Architecture       
NAVIGATION, Journal of the Institute of Navigation, Vol. 45, No. 1, Spring 1998, pp. 31-38, DOI 10.1002/j.2161-4296.1998.tb02369.x

Pervan, Boris S., Pullen, Samuel P., and Christie, Jock R. I.       
A Multiple Hypothesis Approach to Satellite Navigation Integrity       
NAVIGATION, Journal of the Institute of Navigation, Vol. 45, No. 1, Spring 1998, pp. 61-71, DOI 10.1002/j.2161-4296.1998.tb02372.x

Pervan, Boris S., Pullen, Samuel P., Lawrence, David G., Gromov, Konstantin, Christie, Jock R. I., Opshaug, Guttorm, Lu, Vicky, Ko, Ping-Ya, Enge, Per K. and Parkinson, Bradford W       
Prototype LAAS Architecture Design Considerations       
Published in GPS Solutions, Vol. 2., No. 1, July 1998.

Abbott, Eric       
Land-vehicle navigation systems: An examination of the influence of individual navigation aids on system performance       
Ph.D. Dissertation, Stanford University, March 1997

Barrows, Andrew K., Alter, Keith W., Enge, Per K., Parkinson, Bradford W., and Powell, J. David       
Operational Experience with and Improvements to a Tunnel-in-the-Sky Display for Light Aircraft       
Presented September 1997 at the ION GPS Conference, Kansas City, Missouri.

Breivik, K., Forssell, B., Kee, C., Enge, P., and Walter, T.       
Estimation of Multipath Error in GPS Pseudorange Measurements       
NAVIGATION, Journal of the Institute of Navigation, Vol. 44, No. 1, Spring 1997, pp. 43-52, DOI 10.1002/j.2161-4296.1997.tb01938.x

Christie, Jock R. I., Parkinson, Bradford W., and Enge, Per K       
A Proposed Signal Design for GNSS2: The Use of Faster and Longer Codes to Provide Real-Time Single Frequency Ionospheric Measurements       
Presented April 1997 at GNSS-97 in Munich, Germany.

Chao, Yi-Chung       
Real Time Implementation of the Wide Area Augmentation System for the Global Positioning System with an Emphasis on Ionospheric Modeling       
Ph.D. Dissertation, Stanford University, June 1997

Cobb, H. Stewart       
GPS Pseudolites: Theory, Design, and Applications       
Ph.D. Dissertation, Stanford University, 1997.

Dai, Donghai, Walter, Todd, Comp, Christopher J., Tsai, Yeo-Jyh, Ko, Ping-Ya, Enge, Per K. and Powell, J. David       
High Integrity Multipath Mitigation Techniques for Ground Reference Stations       
Presented September 1997 at ION GPS Conference, Kansas City, Missouri.

Elkaim, Gabriel H., O'Connor, Michael L., Bell, Thomas, and Parkinson, Bradford, W       
System Identification and Robust Control of Farm Vehicles Using Carrier-Phase Differential GPS       
Presented September 1997 at the ION GPS Conference, Kansas City, Missouri.

Enge, Per       
WAAS Messaging System: Data Rate, Capacity, and Forward Error Correction       
NAVIGATION, Journal of the Institute of Navigation, Vol. 44, No. 1, Spring 1997, pp. 63-76, DOI 10.1002/j.2161-4296.1997.tb01940.x

Evans, Jennifer D., Elkaim, Gabriel H., Lo, Sherman C., and Parkinson, Bradford W       
System Identification of an Autonomous Aircraft using GPS       
Presented at the 10^th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 1065-1071.

Hansen, Andrew J., Chao, Yi-Chung, Walter, Todd, and Enge, Per K       
Ionospheric Estimation and Integrity Threat Detection       
Presented January 1997 at ION NTM'97, Santa Monica, California.

Hansen, Andrew J., Walter, Todd, and Enge, Per K       
Ionospheric Correction Using Tomography       
Presented September 1997 at the ION GPS Conference, Kansas City, Missouri.

Hayward, Roger C., Gebre-Egziabher, Demoz, Schwall, Matt, Powell, J. David and Wilson, John       
Inertially Aided GPS Based Attitude Heading Reference System (AHRS) for General Aviation Aircraft       
Presented September 1997 at the ION GPS Conference, Kansas City, Missouri.

Kee, Changdon, Walter, Todd, Enge, Per, and Parkinson, Bradford       
Quality Control Algorithms on WAAS Wide-Area Reference Stations       
NAVIGATION, Journal of the Institute of Navigation, Vol. 44, No. 1, Spring 1997, pp. 53-62, DOI 10.1002/j.2161-4296.1997.tb01939.x

Lightsey, Glenn       
Development and flight demonstration of a GPS receiver for space       
Ph.D. Dissertation, Stanford University, February 1997

Lo, Sherman, Kee, Changdon, and Enge, Per,       
Algorithms for crossover point determination       
Published in Computers & Mathematics with Applications, Vol 33, No 11, pp 117-131, June 1997. DOI 10.1016/S0898-1221(97)00089-8

Ndili, Awele and Enge, Per K       
Receiver Autonomous Interference Detection       
Presented June 1997 at the 53^rd Annual Meeting of the Institute of Navigation, Albuquerque, New Mexico.

O'Connor, Michael       
Carrier-phase differential GPS for automatic control of land vehicles       
Ph.D. Dissertation, Stanford University, December 1997

Pervan, Boris S., Pullen, Samuel P., Lawrence, David G., Gromov, Konstantin, Christie, Jock R. I., Opshaug, Guttorm, Lu, Vicky, Ko, Ping-Ya, Enge, Per K. and Parkinson, Bradford W       
Development, Implementation, and Testing of a Prototype LAAS Architecture       
Presented April 1997 at GNSS-97 in Munich, Germany.

Pervan, Boris S. and Parkinson, Bradford W       
Cycle Ambiguity Estimation for Aircraft Precision Landing Using the Global Positioning System       
Published in Journal of Guidance, Control, and Dynamics, Vol. 20, No. 4, July 1997.

Pervan, Boris S., Lawrence David G., Gromov, Konstantin, Opshaug, Guttorm, Christie, Jock R.I., Ko, Ping-Ya, Mitelman, Alexander M., Pullen, Samuel P., Enge, Per K. and Parkinson, Bradford W       
Flight Test Evaluation of a Prototype Local Area Augmentation System Architecture       
Presented September 1997 at the ION GPS Conference, Kansas City, Missouri.

Teague, Edward Harrison       
Flexible structure estimation and control using the global positioning system       
Ph.D. Dissertation, Stanford University, May 1997

Walter, Todd, Enge Per K. and Hansen, Andrew J       
An Integrity Equation for Use with Space Based Augmentation Systems       
Presented April 1997 at GNSS-97 in Munich, Germany.

Walter, Todd, Enge Per K. and Hansen, Andrew J       
A Proposed Integrity Equation for WAAS MOPS       
Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 475-484. *Best Presentation Award

Barrows, Andrew K., Enge, Per, Parkinson, Bradford W., and Powell, J. David       
Evaluation of a Perspective-View Cockpit Display for General Aviation Using GPS       
NAVIGATION, Journal of the Institute of Navigation, Vol. 43, No. 2, Summer 1996, pp. 179-190, DOI 10.1002/j.2161-4296.1996.tb01917.x

Barrows, Andrew K., Enge, Per K., Parkinson, Bradford W. and Powell, J. David       
Flying Curved Approaches and Missed Approaches: 3-D Display Trials Onboard a Light Aircraft       
Presented September 1996 at the ION GPS Conference, Kansas City, Missouri.

Barrows, Andrew K., Gebre-Egziabher, Demoz, Hayward, Roger C., Xia, Renxin, and Powell, J. David       
GPS-Based Attitude and Guidance Displays for General Aviation       
Presented November 1996 at IEEE Emerging Technologies and Factory Automation '96, Kauai, Hawaii.

Chao, Yi-Chung, Pullen, Samuel P., Enge, Per K. and Parkinson, Bradford, W       
Study of WAAS Ionospheric Integrity       
Presented at the 9^th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 1996, Kansas City, MO, pp. 781-788.

Christie, Jock R. I., Parkinson, Bradford W., Enge, Per K       
The Effect of the Ionosphere and C/A Frequency on GPS Signal Shape: Considerations for GNSS-2       
Presented September 1996 at the ION GPS Conference, Kansas City, Missouri.

Conway, Andrew, Montgomery, Paul Y., Rock, Stephen M., Cannon, Robert and Parkinson, Bradford W.       
A New Motion-Based Algorithm for GPS Attitude Integer Resolution       
NAVIGATION, Journal of the Institute of Navigation, Vol. 43, No. 2, Summer 1996, pp. 179-190, DOI 10.1002/j.2161-4296.1996.tb01924.x

Elkaim, Gabriel H., O'Connor, Michael L., Bell, Thomas and Parkinson, Bradford W       
System Identification of a Farm Vehicle Using Carrier-Phase Differential GPS       
Presented September 1996 at the ION GPS Conference, Kansas City, Missouri.

Enge, Per, Walter, Todd, Pullen, Sam, Kee, Changdon, Chao, Yi-Chung, and Tsai, Yeou-Jyh       
Wide area augmentation of the Global Positioning System       
Published in Proceedings of the IEEE, Vol. 84, No 8, pp.1063 - 1088, DOI: 10.1109/5.533954

Gazit, Ran       
Aircraft surveillance and collision avoidance using GPS       
Ph.D. Dissertation, Stanford University, September 1996

Gazit, Ran Y       
Digital Tracking Filters with High Order Correlated Measurement Noise       
IEEE Xplore Aerospace and Electronic Systems, IEEE Transactions in Vol. 33, Issue 1, 1996, pp. 171-177.

Lawrence, David       
Aircraft Landing Using GPS: Development and Evaluation of a Real Time System for Kinematic Position using the Global Positioning System       
Ph.D. Dissertation, Stanford University, September 1996

Lawrence, David G., Cobb, H. Stewart, Pervan, Boris S., Opshaug, Guttorm, Enge, Per K., Powell, J. David and Parkinson, Bradford W       
Performance Evaluation of On-Airport Local Area Augmentation System Architectures       
Presented September 1996 at the ION GPS Conference, Kansas City, Missouri.

Lightsey, E. Glenn and Parkinson, Bradford W       
GPS Based Attitude Determination On Nonaligned Antenna Arrays       
Presented at the 9^th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996) September 1996, Kansas City, Missouri, pp. 1081-1090.

Montgomery, Paul       
Carrier differential GPS as a sensor for automatic control: Development of a full state estimation and flight control system for an autonomous aircraft based on the global positioning system       
Ph.D. Dissertation, Stanford University, December 1996

Montgomery, Paul Y. and Parkinson, Bradford W       
Carrier Differential GPS for Takeoff to Landing of an Autonomous Aircraft       
Presented January 1996 in Proceedings of the 1996 National Technical Meeting of The Institute of Navigation, Santa Monica, California.

O'Connor, Michael L., Elkaim, Gabriel H., and Parkinson, Bradford W.       
Carrier Phase DGPS for Closed-Loop Control of Farm and Construction Vehicles       
NAVIGATION, Journal of the Institute of Navigation, Vol. 43, No. 2, Summer 1996, pp. 167-178, DOI 10.1002/j.2161-4296.1996.tb01923.x

O'Connor, Michael L., Bell, Thomas, Elkaim, Gabriel H., and Parkinson, Bradford W       
Automatic Steering of Farm Vehicles Using GPS       
Presented June 1996 at the 3^rd International Conference on Precision Agriculture, Minneapolis, Minnesota.

Pervan, Boris       
Navigation integrity for aircraft precision landing using the global positioning system       
Ph.D. Dissertation, Stanford University, March 1996

Pullen, Sam       
Probabilistic engineering design optimization: Application to spacecraft and navigation systems       
Ph.D. Dissertation, Stanford University, June 1996

Pullen, Samuel P., Pervan, Boris S., Per Enge and Parkinson, Bradford W       
A Comprehensive Integrity Verification Architecture for On-Airport LAAS Category III Precision Landing       
Presented September 1996 at the ION GPS Conference, Kansas City, Missouri.

Teague, E. Harrison, How, Jonathan P., Lawson, London G., Boerjes, Michael and Parkinson, Bradford W       
Techniques for Real-Time Control of Flexible Structures using GPS       
Presented February 1996 at the American Astronautical Society, Guidance, Navigation and Control Conference, Breckenridge, Colorado.

Teague, E. Harrison, How, Jonathan P., and Parkinson, Bradford W       
Carrier Differential GPS for Real-Time Control of Large Flexible Structures       
Presented September 1996 at the ION GPS Conference, Kansas City, Missouri.

Uematsu, Hirohiko and Parkinson, Bradford W       
GPS Receiver Development and Verification Tests for the Stanford Gravity Probe B Relativity Mission - Verification Test Plan and Preliminary Results       
Presented at the 9^th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1996), September 1996, Kansas City, Missouri, pp. 1081-1090.

Abbott, Eric C. and Powell, J. David       
An Examination of the Relative Merits of Various Sensors for Vehicle Navigation       
NAVIGATION, Journal of the Institute of Navigation Presented September 1995 at ION GPS, Palm Springs, California.

Barrows, Andrew K., Enge, Per K., Parkinson, Bradford W., and Powell, J. David       
Flight Tests of a 3-D Perspective-View Glass-Cockpit Display for General Aviation Using GPS       
Presented September 1995 at ION GPS, Palm Springs, California.

Buchman, Saps, Turneaure, John P., Walter, Todd, and Everitt, C. W. Francis       
A Low Temperature Gyroscope Clock for Gravitational Redshift Experiments       
Published in Rencontres de Moriond on Dark Matter in Cosmology, Clocks and Tests of Fundamental Laws, Villars sur Ollon, Switzerland January 1995

Chao, Yi-Chung, Tsai, Yeo-Jyh, Walter, Todd, Kee, Changdon, Enge, Per K., Parkinson, Bradford W       
The Ionospheric Model Improvement for the Stanford WAAS Network       
NAVIGATION, Journal of the Institute of Navigation Presented January 1995 at the 1995 National Technical Meeting of The Institute of Navigation, Anaheim, CA Presented February 1995 at the AAS Guidance and Control Conference, Keystone, Colorado.

Chao, Yi-Chung, Tsai, Yeo-Jyh, Walter, Todd, Kee, Changdon, Enge, Per K., and Parkinson, Bradford W       
An Algorithm for Inter-frequency Bias Calibration and Application to WAAS Ionosphere Modeling       
NAVIGATION, Journal of the Institute of Navigation Presented September 1995 at ION GPS, Palm Springs, California.

Cobb, H. Stewart, Lawrence, David G., Boris S. Pervan, Cohen, Clark E., Powell, J. David, and Parkinson, Bradford W       
Precision Landing Tests with Improved Integrity Beacon Pseudolites       
Presented September 1995 at ION GPS, Palm Springs, California.

Cobb, H. Stewart, Lawrence, David G., Jock R.I. Christie, Todd Walter, Chao, Yi-Chung, Powell, J. David, and Parkinson, Bradford W       
Observed GPS Signal Continuity Interruptions       
Presented September 1995 at ION GPS, Palm Springs, California.

Cohen, Clark E., Cobb, H. Stewart, Lawrence, David G., and Pervan, Boris S., et. al       
Automatic Landing of a 737 using GNSS Integrity Beacons       
Presented February 1995 at ISPA, Braunschweig, Germany.

Gazit, Ran Y       
Aircraft Tracking using GPS Position and Velocity Reports       
NAVIGATION, Journal of the Institute of Navigation Presented September 1995 at ION GPS, Palm Springs, California.

Lawrence, David G., Pervan, Boris S., Cohen, Clark E., Cobb, H. Stewart, Powell, J. David, and Parkinson, Bradford W       
A Real-Time Architecture for Kinematic GPS Applied to the Integrity Beacon Landing System       
Presented June 1995 at 51^st Institute of Navigation meeting in Colorado Springs, Colorado.

Lawrence, David G., Cobb, H. Stewart, Cohen, Clark E., Pervan, Boris S., Powell, J. David, and Parkinson, Bradford W       
Maintaining GPS Positioning in Steep Turns Using Two Antennas       
NAVIGATION, Journal of the Institute of Navigation Presented September 1995 at ION GPS, Palm Springs, California.

Montgomery, Paul Y., Uematsu, Hirohiko, and Parkinson, Bradford W       
Full State Estimation and Control of a Large Model Aircraft Using Carrier Phase Differential GPS       
Presented April 1995 at DSNS Bergen, Norway.

O'Connor, Michael L., Elkaim, Gabriel H., and Parkinson, Bradford W       
Kinematic GPS for Closed Loop Control of Farm and Construction Vehicles       
Presented September 1995 at ION GPS '95, Palm Springs, California.

Parkinson, Bradford W., Stansell, Thomas, Beard, Ronald, and Gromov, Konstatin,       
A History Of Satellite Navigation       
NAVIGATION, Journal of the Institute of Navigation Journal of the Institute of Navigation, Vol. 42, No. 1, Special Issue. March 1995, pp. 109-164.

Pervan, Boris S., Cohen, Clark E., Lawrence, David G., Cobb, H. Stewart, Powell, J. David, and Parkinson, Bradford W       
High Integrity GPS-Based Precision Landing Using Integrity Beacon Pseudolites       
Presented February 1995 at ISPA, Braunschweig, Germany.

Pullen, Samuel P., Enge, Per K., and Parkinson, Bradford W       
A New Method for Coverage Prediction for the Wide Area Augmentation System (WAAS)       
Presented June 1995 at ION Annual Meeting, Colorado Springs, Colorado.

Pullen, Samuel P., Enge, Per K., and Parkinson, Bradford W       
Global Optimization of GPS Augmentation Architectures using Genetic Algorithms       
Presented September 1995 at ION GPS '95, Palm Springs, California.

Teague, E. Harrison, How, Jonathan P., London G. Lawson, and Parkinson, Bradford W       
GPS as a Structural Deformation Sensor       
Proceedings of the AIAA Guidance, Navigation and Control Conference, Baltimore, Maryland. August 1995.

Tsai, Yeo-Jyh, Chao, Yi-Chung, Walter, Todd, Kee, Changdon, Powell, J. David, Enge, Per K., and Parkinson, Bradford W       
Evaluation of Orbit and Clock Models for Real Time WAAS       
NAVIGATION, Journal of the Institute of Navigation Presented January 1995 at the 1995 National Technical Meeting of The Institute of Navigation, Anaheim, California. Presented February 1995 at the AAS Guidance and Control Conference, Keystone, Colorado.

Tsai, Yeou-Jyh, Enge, Per, Chao, Yi-Chung, Walter, Todd, Kee, Changdon, Evans, Jennifer, Barrows, Andrew, Powell, David, and Parkinson, Bradford       
Validation of the RTCA Message Format for WAAS       
Published in Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 661-670.

Walter, Todd and Enge, Per K       
Weighted RAIM for Precision Approach       
Presented September 1995 at ION GPS-95, Palm Springs, California.

Cobb, H. Stewart, Cohen, Clark E., and Parkinson Bradford W       
Theory and Design of Pseudolites       
NAVIGATION, Journal of the Institute of Navigation Presented January 1994 at Institute of Navigation, National Technical Meeting, San Diego, California.

Cohen, Clark E., Pervan, Boris S., Cobb, H. Stewart, Lawrence, David G., Powell, J. David, and Parkinson, Bradford W       
Achieving Required Navigation Performance using GNSS for Category III Precision Landing       
Presented April 1994 at DSNS-94, London, U.K.

Cohen, Clark E., Lightsey, E. Glenn, Parkinson, Bradford W., and Feess, William A       
Space Flight Tests of Attitude Determination using GPS       
International Journal of Satellite Communications, Vol. 12, 427-433 (1994).

Cohen, Clark E., Pervan, Boris S., Lawrence, David G., Cobb, H. Stewart, Powell, J. David, and Parkinson, Bradford W       
Real-Time Flight Testing Using Integrity Beacons for GPS Category III Precision Landing       
NAVIGATION, Journal of the Institute of Navigation, Vol. 41, No. 2, Summer 1994

Cohen, Clark E., Lawrence, David G., Pervan, Boris S., Cobb, H. Stewart, Barrows, Andrew K., Powell, J. David, Parkinson, Bradford W., Wullschleger, Victor, and Kalinowski, S       
Flight Test Results of Autocoupled Approaches using GPS and Integrity Beacons       
NAVIGATION, Journal of the Institute of Navigation Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Gazit, Ran Y. and Powell, J. David       
Communication Protocols for GPS-based Surveillance and TCAS       
NAVIGATION< Journal of the Institute of Navigation Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Kee, Changdon and Parkinson, Bradford W       
Wide Area Differential GPS as a Future Navigation System in the U.S.       
IEEE Xplore Presented April 1994 at IEEE PLANS '94, Las Vegas, Nevada.

Kee, Changdon and Parkinson, Bradford W       
Calibration of Multipath Errors on GPS Pseudorange Measurements       
NAVIGATION, Journal of the Institute of Navigation Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Lightsey, E. Glenn, Cohen, Clark E., Feess, William A., and Parkinson, Bradford W       
Analysis of Spacecraft Attitude Measurements using Onboard GPS       
Presented February 1994 at AAS Conference, Keystone, Colorado.

Lightsey, E. Glenn, Cohen, Clark E., and Parkinson, Bradford W       
Development of a GPS Receiver for Reliable Real-Time Attitude Determination in Space       
NAVIGATION, Journal of the Institute of Navigation Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Montgomery, Paul Y., Uematsu, Hirohiko, and Parkinson, Bradford W       
Analysis of Angular Velocity Determination Using GPS       
NAVIGATION, Journal of the Institute of Navigation Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Ndili, Awele       
GPS Pseudolite Signal Design       
Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Pervan, Boris S., Cohen, Clark E., and Parkinson, Bradford W       
Autonomous Integrity Monitoring for Precision Approach using DGPS and a Ground-based Pseudolite       
Presented February 1994 at AAS Conference, Keystone, Colorado.

Pervan, Boris S., Cohen, Clark E., and Parkinson, Bradford W       
Integrity in Cycle Ambiguity Resolution for GPS-based Precision Landing       
Presented April 1994 at DSNS-94, London, UK.

Pervan, Boris S., Cohen, Clark E., Lawrence, David G., Cobb, H. Stewart, Powell, J. David, and Parkinson, Bradford W       
Autonomous Integrity Monitoring for GPS-based Precision Landing using Ground-based Integrity Beacon Pseudolites       
NAVIGATION>, Journal of the Institute of Navigation Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Pullen, Samuel P., Pervan, Boris S., and Parkinson, Bradford W       
A New Approach to GPS Integrity Monitoring Using Prior Probability Models and Optimal Threshold Search       
Presented April 1994 at IEEE PLANS '94, Las Vegas, Nevada.

Pullen, Samuel P., Enge, Per K., and Parkinson, Bradford W       
Simulation-Based Evaluation of WAAS Performance: Risk and Integrity Factors       
Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Uematsu, Hirohiko and Parkinson, Bradford W       
Antenna Baseline and Line Bias Estimation Using Pseudolites for GPS-based Attitude Determination       
NAVIGATION, Journal of the Institute of Navigation Presented September 1994 at ION GPS '94, Salt Lake City, Utah.

Walter, Todd, Pervan, Boris S., Enge, Per K., Herendeen, John, and Levin, Peter L       
Autonomous Integrity Monitoring and Wide Area DGPS       
NAVIGATION, Journal of the Institute of Navigation Presented January 1994 at ION National Technical Meeting, San Diego, California.

Walter, Todd       
Characterizing frequency stability: a continuous power-law model with discrete sampling       
Published in IEEE Transactions on Instrumentation and Measurement, vol. 43, no. 1, pp. 69-79, Feb. 1994, doi: 10.1109/19.286357.

Walter, Todd, Kee, Changdon, Chao, Yi-Chung, Tsai, Yeo-Jyh, Peled, Uri, Ceva, Juan G., Barrows, Andrew K., Abbott, Eric C., Powell, J. David, Enge, Per K., and Parkinson, Bradford W       
Flight Trials of the Wide-Area Augmentation System (WAAS)       
Presented September 1994 at ION GPS 1994, Salt Lake City, Utah.

Ceva, Juan G. and Parkinson, Bradford W       
Multipath Interference in Orbiting Receivers Due to Earth Surface Reflections       
NAVIGATION, Journal of the Institute of Navigation Presented September 1993 at ION GPS '93, Salt Lake City, Utah.

Chao, Yi-Chung and Parkinson, Bradford W       
The Statistics of Selective Availability and Its Effect on Differential GPS       
NAVIGATION, Journal of the Institute of Navigation Presented September 1993 at ION GPS '93, Salt Lake City, Utah.

Cohen, Clark E., McNally, B. David, and Parkinson, Bradford W       
Flight Tests of Attitude Determination Using GPS Compared Against an Inertial Navigation Unit       
NAVIGATION, Journal of the Institute of Navigation Presented January 1993 at the ION National Technical Meeting, San Francisco, California.

Cohen, Clark E., Pervan, Boris S., Cobb, H. Stewart, Lawrence, David G., Powell, J. David, and Parkinson, Bradford W       
Real-time Cycle Ambiguity Resolution using a Pseudolite for Precision Landing of Aircraft with GPS       
Presented March 1993 at the Second International Symposium on Differential Satellite Navigation Systems, Amsterdam, The Netherlands.

Cohen, Clark E., Boris S. Pervan, Lawrence, David G., Cobb, H. Stewart, Powell, J. David, and Parkinson, Bradford W       
Real-time Flight Test Evaluation of the GPS Marker Beacon Concept for Category III Kinematic GPS Precision Landing       
NAVIGATION, Journal of the Institute of Navigation Presented September 1993 at ION GPS '93, Salt Lake City, Utah.

Cohen, Clark E., E. Glenn Lightsey, Parkinson, Bradford W., and Feess, William A       
Space Flight Tests of Attitude Determination Using GPS: Preliminary Results       
NAVIGATION, Journal of the Institute of Navigation Presented September 1993 at ION GPS '93, Salt Lake City, Utah.

Kee, Changdon       
Wide Area Differential GPS (WADGPS)       
Ph.D. Dissertation, Stanford University, December 1993

Kee, Changdon, Parkinson and Bradford W       
High Accuracy GPS Positioning in the Continent: Wide Area Differential GPS       
Presented March 1993 at the Second International Symposium on Differential Satellite Navigation Systems, Amsterdam, The Netherlands.

Kee, Changdon and Parkinson, Bradford W       
Static Test Results of Wide Area Differential GPS       
NAVIGATION, Journal of the Institute of Navigation Presented September 1993 at ION GPS '93, Salt Lake City, Utah.

Lightsey, E. Glenn, Cohen, Clark E., and Parkinson, Bradford W       
Application of GPS Attitude Determination to Gravity Gradient Stabilized Spacecraft       
ABSTRACT Aerospace Research Central AIAA       
Presented August 1993 at AIAA Guidance and Control Conference, Monterey, California.

Pervan, Boris S., Cohen, Clark E., and Parkinson, Bradford W       
Autonomous Integrity Monitoring for Precision Approach using DGPS and a Ground-based Pseudolite       
NAVIGATION, Journal of the Institute of Navigation Presented September 1993 at ION GPS '93, Salt Lake City, Utah.

Teague, E. Harrison and Parkinson, Bradford W       
Translation, Rotation and Vibration Control of Large Space Structures using Self-differential GPS (SDGPS)       
Presented February 1993 at the 16^th Annual AAS Guidance and Control Conference, Keystone, Colorado.

Uematsu, Hirohiko       
The Gravity Probe B niobium bird experiment: Experimental verification of a data reduction scheme with a prototypical dc SQUID readout system       
Ph.D. Dissertation, Stanford University, October 1993

Walter, Todd       
A Multi-Variance Analysis in the Time Domain       
In Proceedings of the Frequency Control Symposium December, 1993

Cohen, Clark       
Attitude Determination Using GPS       
Ph.D. Dissertation, Stanford University, December 1992

Cohen, Clark E. and Parkinson, Bradford W       
Integer Ambiguity Resolution of the GPS Carrier for Spacecraft Attitude Determination       
Presented February 1992 at the 15^th Annual AAS Guidance and Control Conference, Keystone, Colorado.

Cohen, Clark E., Pervan, Boris S., and Parkinson, Bradford W       
Estimation of Absolute Ionospheric Delay Exclusively through Single-Frequency GPS Measurements       
NAVIGATION, Journal of the Institute of Navigation Presented September 1992 at ION GPS '92, Albuquerque, New Mexico.

Cohen, Clark E., Cobb, H. Stewart, and Parkinson, Bradford W       
Generalizing Wahba's Problem for High Output Rates and Evaluation of Static Accuracy using a Theodolite       
NAVIGATION, Journal of the Institute of Navigation Presented September 1992 at ION GPS '92, Albuquerque, New Mexico.

Cohen, Clark E. and Parkinson, Bradford W       
ABSTRACT Aircraft Applications of GPS-based Attitude Determination       
NAVIGATION, Journal of the Institute of Navigation Presented September 1992 at ION GPS '92, Albuquerque, New Mexico.

Kasdin, N. Jeremy and Walter, Todd       
Discrete simulation of power law noise (for oscillator stability evaluation)       
Published in Proceedings of the 1992 IEEE Frequency Control Symposium.

Kee, Changdon and Parkinson, Bradford W       
Algorithms and Implementation of Wide Area Differential GPS       
NAVIGATION, Journal of the Institute of Navigation Presented September 1992 at ION GPS '92, Albuquerque, New Mexico.

Cohen, Clark E. and Parkinson, Bradford W       
Mitigating Multipath Error in GPS-based Attitude Determination       
Presented February 1991 at the 14^th Annual AAS Guidance and Control Conference, Keystone, Colorado.

Cohen, Clark E. and Parkinson, Bradford W       
Expanding the Performance Envelope of GPS-Based Attitude Determination       
NAVIGATION, Journal of the Institute of Navigation Presented September 1991 at ION/GPS Conference, Albuquerque, New Mexico.

Axelrad, Penina       
A closed loop GPS-based orbit trim system for Gravity Probe B       
Ph.D. Dissertation, Stanford University, October 1990

Kee, Changdon, Parkinson, Bradford W., and Axelrad, Penina       
Wide Area Differential GPS, Outstanding Paper Award Winner       
NAVIGATION, Journal of the Institute of Navigation Presented September 1990 at ION Satellite Division 3rd International Technical Meeting, Colorado Springs, Colorado.

Parkinson, Bradford W. and Axelrad, Penina       
Techniques for Autonomous GPS Integrity Monitoring       
Published June 1990 by Advisory Group for Aerospace Research and Development (AGARDograph, No. 314).

Walter, Todd, Turneaure, John P., Buchman, Saps, Everitt, C.W.Francis, and Keiser, G.Mac       
An Ultra High Vacuum Low Temperature Gyroscope Clock       
Published in Physica B: Condensed Matter, Volumes 165–166, Part 1, Pages 155-156, 1990.

Axelrad, P. and Parkinson, B. W.       
Closed Loop Navigation and Guidance for Gravity Probe B Orbit Insertion       
NAVIGATION, Journal of the Institute of Navigation, Vol. 36, No. 1, Spring 1989, pp. 45-62.

Parkinson, Bradford W. and Axelrad, Penina       
A Basis for the Development of Operational Algorithms for Simplified GPS Integrity Checking       
Presented January 26-29, 1988 at the Institute of Navigation National Technical Meeting.

Parkinson, Bradford W. and Fitzgibbon, Kevin T       
Aircraft Automatic Landing Systems Using GPS       
(Invited paper) Proceedings February 1988 of the International Congress of Navigation Societies, Sidney, Australia.

Parkinson, Bradford W. and Axelrad, Penina       
Receiver Autonomous Integrity Monitoring of the Navigation Service Provided by the Global Positioning System       
Report submitted in May 1988 to the U.S. Department of Transportation.

Parkinson, Bradford W. and Axelrad, Penina       
Autonomous GPS Integrity Monitoring Using the Pseudorange Residual       
NAVIGATION, Journal of the Institute of Navigation Journal of the Institute of Navigation, Vol. 35, No. 2. Summer 1988.

Parkinson, Bradford W. and Fitzgibbon, Kevin T       
Optimal Locations of Pseudolites for Differential GPS       
NAVIGATION, Journal of the Institute of Navigation Journal of the Institute of Navigation, Vol. 33, No. 4. Winter 1986-1987.

Parkinson, Bradford W. and Axelrad, Penina       
Simplified GPS Integrity Checking with Multiple Satellites       
Proceedings of the 43rd Annual Meeting of The Institute of Navigation (1987), Dayton, Ohio, June 1987, pp. 78-83.

Parkinson, Bradford W. and Axelrad, Penina       
A Basis for the Development of Operational Algorithms for Simplified GPS Integrity Checking       
Proceedings of the Satellite Division's First Technical Meeting (ION GPS 1987), Colorado Spring, CO, September 1987, pp. 269-276.

Klein, Dale and Parkinson, Bradford W       
The Use of Pseudo-Satellites for Improving GPS Performance       
NAVIGATION, Journal of the Institute of Navigation Journal of the Institute of Navigation, Vol. 31, No. 4. Winter 1984-1985.

Parkinson, Bradford W. and Gilbert, S. W       
NAVSTAR: Global Positioning System - Ten Years Later       
IEEE Xplore Proceedings of the IEEE, Vol. 71, No. 10, p. 1177-1186. October 1983.

Beser, Jacques and Parkinson, Bradford W       
The Application of NAVSTAR Differential GPS in the Civilian Community       
NAVIGATION, Journal of the Institute of Navigation Journal of the Institute of Navigation, Vol. 29, No. 2. Summer 1982.