2026
Kim, Junsoo, Nam, Gihun, Lee, Jiyun, Min, Dongchan, and Pullen, Sam
Framework for Determining Lateral Minimum Separation Distance Using ADS-B Information
Presented at the ION 2026 Pacific PNT Meeting, Honolulu, Hawaii, April 2026.
Kriezis, Argyris, Blanch, Juan, Chen, Yu-Hsuan, Akos, Dennis, Lo, Sherman, and Walter, Todd
Power-Based RFI Localization Using a Network of Unmodified COTS GNSS Receivers
Presented at the ION 2026 Pacific PNT Meeting, Honolulu, Hawaii, April 2026.
Lo, Sherman, Liu, Zixi, Ibrahim, Lyla, Chen, Yu Hsuan, Akos, Dennis, and Walter, Todd
Global Incidents of Aviation Spoofing in 2024-2025 Detected with Automatic Dependent Surveillance Broadcast
Presented at the 2026 International Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2026.
Sparks, Lawrence, Altshuler, Eric, Blanch, Juan, Walter, Todd, McCord, Emily, and Griffin Sanchez, Rhiannon
WAAS and the ionosphere – a historical perspective: Mitigating Mesoscale Irregularities
Published in
NAVIGATION, Vol. 73 No. 1, January 2026, DOI 10.33012/navi.757.
Sparks, Lawrence, Altshuler, Eric, Blanch, Juan, Walter, Todd, McCord, Emily, and Griffin Sanchez, Rhiannon
WAAS and the ionosphere – a historical perspective: Threat Model Evolution
Published in
NAVIGATION, Vol. 73 No. 1, January 2026, DOI 10.33012/navi.758.
Wang, Rebecca, Min, Donghan, Blanch, Juan, and Walter, Todd
User Domain Overbounding with Integrity of Time-Correlated Errors for Precise Point Positioning
Presented at the ION 2026 Pacific PNT Meeting, Honolulu, Hawaii, April 2026.
2025
Babcock-Chi, Jade, Lo, Sherman, Chen, Yu-Hsuan, Blanch, Juan, and Walter, Todd
TDOA-Based Spoofing Source Localization Using Multi-Constellation Unsynchronized Receivers
Presented at the 38th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2025), Baltimore, MD, September 2025.
Blanch, Juan, Lo, Sherman, Chen Yu-Hsuan, Kriezis, Argyris, and Walter, Todd
Determining Protection Levels Using Multiple Antennas under Spoofing Conditions
Presented at the IEEE/ION Position Location and Navigation Symposium (PLANS), Salt Lake City, UT, April 2025.
Blanch, Juan, Lo, Sherman, Chen, Yu-Hsuan, Kreizis, Anargyros, and Walter, Todd
Protection Levels Against Spoofing Using Dual Antennas: a Practical Approach
Presented at the 38th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2025), Baltimore, MD, September 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
Presented at 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
Presented at the 2025 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2025.
Kriezis, 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?
Published in
Inside GNSS, March 31, 2025.
Kriezis, Argyris, Chen, Yu-Hsuan, Lo, Akos, Dennis, Sherman, and Walter, Todd
Utilizing SBAS Signals for RFI Detection and Characterization
Presented at the 38th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2025), Baltimore, MD, September 2025.
Kriezis, Argyris, Chen, Yu-Hsuan, Akos, Dennis, Lo, Sherman, and Walter, Todd
GNSS Jamming and Spoofing Monitoring Using Low-Cost COTS Receivers
Published in
Submitted to NAVIGATION, September 2025, DOI 10.48550/arXiv.2509.13600.
Liu, Zixi, Lo, Sherman, Blanch, Juan, Chen, Yu-Hsuan, and Walter, Todd
Locating GNSS Interference Sources using ADS-B with Non-linear Least Squares
Published in
NAVIGATION, Vol. 72 No. 3, Fall 2025, DOI 10.33012/navi.716.
Liu, Zixi, Lo, Sherman, Chen, Yu-Hsuan, and Walter, Todd
A Scalable Pipeline for Real-Time Global Detection and Localization of GNSS Interference Using ADS-B
Presented at the 38th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2025), Baltimore, MD, September 2025.
Lo, Sherman, Liu, Zixi, Ibrahim, Lyla, Chen, Yu-Hsuan, and Walter, Todd
Observations of GNSS Spoofing in Russia in 2023-2024
Presented at the 2025 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2025.
Oak, Sukrut, Pullen, Sam, Lo, Sherman, Blanch, Juan, Walter, Todd, Crews, Mark, Jackson, Robert, and Frey, Charles
Exploitation of Modernized GPS Crosslinks to Improve User Integrity and Availability with ARAIM
Presented at the IEEE/ION Position Location and Navigation Symposium (PLANS), Salt Lake City, UT, April 2025.
Oak, Sukrut, Pullen, Sam, Lo, Sherman, Blanch, Juan, Walter, Todd, Crews, Mark, Jackson, Robert, and Frey, Charles
Inter-Satellite Ranging Using Modernized GPS Crosslinks for Real-Time Integrity Monitoring and ARAIM ISM
Presented at the 38th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2025), Baltimore, MD, September 2025.
2024
Blanch, Juan, Oak, Sukrut, Pullen, Sam, Lo, Sherman, and Walter, Todd
Advanced RAIM for Mega-Constellations
Presented at the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.
Blanch, Juan, Lai, Frank, Walter, Todd, and Silva, Pedro
Models for the effect of integrity monitors on GNSS user error range distributions
Presented at 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
Presented at 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
Presented at 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
Presented at 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
Presented at 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
Presented at 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
Published in
Inside GNSS, March 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
Presented at the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024.
Patil, Akshata, Phelts, R. Eric, Walter, Todd, and Thoelert, Steffen
Detecting and Localizing Space Based Interference on GNSS Signals using Machine Learning
Presented at the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.
Wang, Rebecca, Lai, Yu-Fang, Blanch, Juan, Akos, Dennis, Phelts, Eric, and Walter, Todd
Characterization of Recent GPS Satellite Clock Jumps
Presented at the 2024 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2024.
2023
Chen, Yu-Hsuan, Liu, Zixi, Blanch, Juan, Lo, Sherman, and Walter, Todd
An RFI Testbed for Examining GNSS Integrity in the Various Environments
Presented at 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
Presented at 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, Walter, Todd, Kahr, Erin, Leahy, Edmond, Silva, Pedro, and Ellum, Cameron
Prototyping Integrity Monitors for PPP Fault Detections
Presented at 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
Presented at the 2023 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2023.
Liu, Zixi, Blanch, Juan, Lo, Sherman, and Walter, Todd
Investigation of GPS interference events with refinement on the localization algorithm
Presented at 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
Presented at 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
Presented at 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
Presented at 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
Presented at 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?
Published in
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
Presented at 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
Presented at 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.
2022
Anderson, Jason, Lo, Sherman, and Walter, Todd
Cryptographic Ranging Authentication with TESLA, Rapid Re-keying, and a PRF
Presented at 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
Presented at 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
Presented at the 2022 International Technical Meeting of The Institute of Navigation, Long Beach, CA, January 2022.
Dacus, Michael, Liu, Zixi, Lo, Sherman, and Walter, Todd
Improved RFI Localization Through Aircraft Position Estimation During Losses in ADS-B Reception
Presented at the 35th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2022), Denver, CO, September 2022.
Liu, Xinwei, Wang, Rebecca, Blanch, Juan, and Walter, Todd
Evaluation of Satellite Clock and Ephemeris Error Bounding Predictability for Integrity Applications
Presented at 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, Walter, Todd, and Blanch, Juan
Real-time Detection and Localization of GNSS Interference Source
Presented at 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
Presented at 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
Presented at 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 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?
Published in
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
Presented at 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, pp. 243-258 2022, 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
Presented at 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.
2021
Anderson, Jason, Lo, Sherman, Neish, Andrew, and Walter, Todd
On SBAS Authentication with OTAR Schemes
Presented at the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.
Blanch, Juan, Liu, Xinwei, Gunning, Kaz, and Walter, Todd
Analysis of GNSS Constellation Performance for Advanced RAIM
Presented at 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
Presented at 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
Presented at the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 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
Presented at the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.
Lo, Sherman, Rothmaier, Fabian, Miralles, Damian, Akos, Dennis, and Walter, Todd
Developing a Practical GNSS Spoofing Detection Thresholds for Receiver Power Monitoring
Presented at the 34th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2021), St. Louis, MO, September 2021.
Nam, Gihun, Kim, Dongwoo, Kim, Noah Minchan, Jiyun Lee, and Pullen, Sam
Enhanced Local-Area DGNSS for Autonomous Vehicle Navigation: Optimal Smoothing Strategy
Presented at 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
Presented at 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 Spoof Detection through Spatial Processing
Published in
NAVIGATION, Vol. 68 No. 2, pp. 243-258 2021, 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
Presented at 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
Presented at 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, December 2021, DOI 10.1109/TAES.2021.3082673.
Walter, Todd, Liu, Zixi, Blanch, Juan, Pham, Kristy, Mick, John, and Wanner, William
Investigation into September 2020 GPS SVN 74 Performance Anomaly
Presented at the 2021 International Technical Meeting of The Institute of Navigation, Virtual, January 2021.
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
Presented at the IEEE/ION Position Location and Navigation Symposium (PLANS), Portland, Oregon, April 2020.
Fernandez-Hernandez, Ignacio, Walter, Todd, Neish, Andrew, and O'Driscoll, Cillian
Independent Time Synchronization for Resilient GNSS Receivers
Presented at the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020.
Joerger, M., Zhai, Y., Martini, I., Blanch, J., and Pervan, B.
ARAIM Continuity and Availability Assertions, Assumptions, and Evaluation Methods
Presented at 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, pp. 727-743 2020, DOI 10.1002/navi.393.
Lo, S., Chen, Y.H., Rothmaier, F., Zhang, G., and Lee, C.
Developing a Dual Polarization Antenna (DPA) for High Dynamic Applications
Presented at 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, pp. 567-582 2020, DOI 10.1002/navi.376.
Lo, Sherman
Chapter 61: Navigation for Aviation
Published in Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume II, Wiley, December 15, 2020, DOI 10.1002/9781119458449.
Milner, Carl, Pervan, Boris, Blanch, Juan, and Joerger, Mathieu
Evaluating Integrity and Continuity Over Time in Advanced RAIM
Presented at 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 2020, DOI 10.1109/MITS.2020.2994117.
Neish, Andrew, Walter, Todd, and Fernandez-Hernandez, Ignacio
Receiver States for SBAS Data Authentication
Presented at the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 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)
Published in Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume I, Wiley, December 15, 2020, DOI 10.1002/9781119458449.
Phelts, R.E., Gunning, K., Blanch, J., and Walter, T.
Evaluating the Application of PPP Techniques to ARAIM Using Flight Data
Presented at the 2020 International Technical Meeting of The Institute of Navigation, San Diego, California, January 2020.
Pullen, Sam and Joerger, Mathieu
Chapter 23: GNSS Integrity
Published in Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume I, Wiley, December 15, 2020, 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
Published in Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume II, Wiley, December 15, 2020, 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
Published in Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume II, Wiley, December 15, 2020, DOI 10.1002/9781119458449.
Walter, Todd, Neish, Andrew, and Blanch, Juan
A Rigid Message Scheduler for SBAS
Presented at the IEEE/ION Position Location and Navigation Symposium (PLANS), Portland, Oregon, April 2020.
Walter, Todd
Chapter 13: Satellite Based Augmentation Systems
Published in Position, Navigation, and Timing Technologies in the 21st Century: Integrated Satellite Navigation, Sensor Systems, and Civil Applications, Volume I, Wiley, December 15, 2020, DOI 10.1002/9781119458449.
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, December 2020, DOI 10.1029/2020EA001314.
2019
Blanch, Juan, Gunning, Kaz, Walter, Todd, de Groot, Lance, and Norman, Laura
Reducing Computational Load in Solution Separation for Kalman Filters and an Application to PPP Integrity
Presented at the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.
Blanch, Juan, Walter, Todd, Berz, Gary, Burns, Jason, Clark, Barbara, Joerger, Mathieu, Mabilleau, Mikael, Martini, Ilaria, Milner, Carl, Pervan, Boris, and Lee, Young
Development of Advanced RAIM Minimum Operational Performance Standards
Presented at 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, and Meurer, Michael
Increasing International Civil Aviation Resilience: A Proposal for Nomenclature, Categorization and Treatment of New Interference Threats
Presented at the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.
Gunning, Kaz, Blanch, Juan, Walter, Todd, de Groot, Lance, and Norman, Laura
Design and Evaluation of Integrity Algorithms for PPP in Kinematic Applications
Published in
Inside GNSS, June 15, 2019.
Gunning, Kazuma, Blanch, Juan, Walter, Todd, de Groot, Lance, and Norman, Laura
Integrity for Tightly Coupled PPP and IMU
Presented at 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
Presented at 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
Presented at 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
Presented at the 2019 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 2019.
Neish, Andrew, Walter, Todd, and Powell, J. David
SBAS Data Authentication: A Concept of Operations
Presented at the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019.
* Best Presentation Award
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
Presented at 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, Lo, Sherman, and Powell, J. David
Single GNSS Antenna Heading Estimation
Presented at the 32nd International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2019), Miami, Florida, September 2019.
* Best Presentation Award
Walter, Todd, Blanch, Juan, Gunning, Kazuma, Joerger, Mathieu, and Pervan, Boris
Determination of Fault Probabilities for ARAIM
Published in
IEEE Transactions on Aerospace and Electronic Systems, Vol. 55 No. 6, pp. 3505-3516, December 2019, DOI 10.1109/TAES.2019.2909727.
2018
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)
Presented at the 31st International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 2018.
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
Presented at the 2018 International Technical Meeting of The Institute of Navigation, Reston, Virginia, January 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
Presented at 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
Presented at 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
Presented at 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
Presented at 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
Presented at 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
Parameter Selection for the TESLA Keychain
Presented at 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, and Enge, Per
Uncoupled Accelerometer Based GNSS Spoof Detection for Automobiles using Statistic and Wavelet Based Tests
Presented at 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
Presented at 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
Presented at 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
Presented at the 31st International Technical Meeting of The Satellite Division of The Institute of Navigation (ION GNSS+ 2018), Miami, Florida, September 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, pp. 205-220 2018, DOI 10.1002/navi.234.
Schneckenburger, Nicolas, Fiebig, Uwe-Carsten, Lo, Sherman, Enge, Per, and Lilley, Robert
Characterization and Mitigation of Multipath for Terrestrial Based Aviation Radionavigation
Published in
NAVIGATION, Vol. 65 No. 2, pp. 143-156 2018, DOI 10.1002/navi.235.
Walter, Todd, Shallberg, Karl, Altshuler, Eric, Wanner, William, Harris, Chris, and Stimmler, Robert
WAAS at 15
Presented at 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, pp. 117-133 2018, DOI 10.1002/navi.214.
Walter, Todd, Blanch, Juan, de Groot, Lance, Norman, Laura, and Joerger, Mathieu
Ionospheric Rates of Change
Presented at 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, pp. 581-600 2018, 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 at IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California, April 2018.
2017
Bisnath, S., Uijt de Haag, M., Diggle, D. W., Hegarty, C., Milbert, D., and Walter, T.
Chapter 12: Differential GNSS and Precise Point Positioning
Published in Understanding GPS/GNSS: Principles and Applications, Third Edition, Artech House, ISBN: 9781630810580, 2017.
Blanch, Juan, Phelts, R. Eric, Chen, Yu-Hsuan, and Enge, Per
Initial Results of a Multi-Constellation ARAIM Airborne Prototype
Presented at the 2017 International Technical Meeting of The Institute of Navigation, Monterey, California, January 2017.
Chen, Yu-Hsuan, Rothmaier, Fabian, Akos, Dennis, Lo, Sherman, and Enge, Per
Towards a Practical Single Element Null Steering Antenna
Presented at the 2017 International Technical Meeting of The Institute of Navigation, Monterey, California, January 2017.
Closas, Pau, Gusi-Amigó, Adrià, and Blanch, Juan
Integrity Measures in Direct-Positioning
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 2017.
Hegarty, Chris, Leva, Joe, Van Dyke, Karen, and Walter, Todd
Chapter 11: Performance of Stand-Alone GNSS
Published in Understanding GPS/GNSS: Principles and Applications, Third Edition, Artech House, ISBN: 9781630810580, 2017.
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, and Enge, Per K.
Feasibility of Fault Exclusion Related to Advanced RAIM for GNSS Spoofing Detection
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 2017.
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, pp. 42-48, July 2017.
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 at Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii, May 2017.
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, pp. 62-71 2017.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 2017.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 2017.
Phelts, R. Eric, Shallberg, Karl, Walter, Todd, and Enge, Per
WAAS Signal Deformation Monitor Performance: Beyond the ICAO Threat Model
Presented at Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii, May 2017.
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, and Dennis, Joseph
Impact of Ionospheric Anomalies on GBAS GAST D Service and Validation of Relevant ICAO SARPs Requirements
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 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, pp. 231-236 2017, 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 at Institute of Navigation (ION) International Technical Meeting, Monterey, California, January 2017.
Walter, Todd, Gunning, Kazuma, Phelts, R. Eric, and Blanch, Juan
Validation of the Unfaulted Error Bounds for ARAIM
Presented at Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii, May 2017.
Yoon, Moonseok, Lee, Jiyun, Pullen, Sam, Gillespie, Joseph, Mathur, Navin, Cole, Rich, de Souza, Jonas Rodrigues, Doherty, Patricia, and Pradipta, Rezy
Equatorial Plasma Bubble Threat Parameterization to Support GBAS Operations in the Brazilian Region
Published in
NAVIGATION, Vol. 64 No. 3, pp. 309-321 2017, DOI 10.1002/navi.203.
2016
Bang, Eugene, Lee, Jinsil, Walter, Todd, and Lee, Jiyun
Preliminary Availability Assessment to Support Single-Frequency SBAS Development in the Korean Region
Published in
GPS Solutions, Vol. 20 No. 3, pp. 299-312, July 2016, DOI 10.1007/s10291-016-0522-4.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 2016.
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 at Institute of Navigation (ION) International Technical Meeting, Monterey, California, January 2016.
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 at Institute of Navigation (ION) International Technical Meeting, Monterey, California, January 2016.
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 at IEEE/ION Position Location and Navigation Symposium (PLANS), Savannah, Georgia, April 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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 2016.
* Best Presentation Award
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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 2016.
Reid, Tyler G. R., Neish, Andrew M., Walter, Todd, and Enge, Per K.
Leveraging Commercial Broadband LEO Constellations for Navigation
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Portland, Oregon, September 2016.
* 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
Published in
GPS Solutions, Vol. 20 No. 4, pp. 737-750, October 2016, 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, pp. 467-490 2016, DOI 10.1002/navi.169.
Walter, Todd, Gunning, Kazuma, and Blanch, Juan
Improved Ephemeris Monitoring for GNSS
Presented at Institute of Navigation (ION) International Technical Meeting, Monterey, California, January 2016.
Walter, Todd, Blanch, Juan, Joerger, Mathieu, and Pervan, Boris S.
Determination of Fault Probabilities for ARAIM
Presented at IEEE/ION Position Location and Navigation Symposium (PLANS), Savannah, Georgia, April 2016.
2015
Blanch, Juan A., Walter, Todd, Enge, Per K., Lee, Y., Pervan, Boris S., Rippl, M., Spletter, A., and Kropp, V.
Baseline Advanced RAIM User Algorithm and Possible Improvements
Published in
IEEE Transactions on Aerospace and Electronic Systems, Vol. 51 No. 1, January 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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2015.
Enge, P., Enge, N., Walter, T., and Eldredge, L.
Aviation Benefits from Satellite Navigation
Published in
New Space, Vol. 3 No. 1, pp. 19-35, March 2015, 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 at Institute of Navigation (ION) International Technical Meeting, Dana Point, California, January 2015.
Lo, Sherman C., Chen, Yu-Hsuan, Enge, Per K., and Akos, Dennis M.
Combining L1 Signals for Improved Sensitivity
Presented at Institute of Navigation (ION) International Technical Meeting, Dana Point, California, January 2015.
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 at Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii, April 2015.
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, pp. 40-53 2015.
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 at European Navigation Conference (ENC GNSS 2015), Bordeaux, France, April 2015.
Perkins, Adrien L. H., Dressel, Louis K., Lo, Sherman C., and Enge, Per K.
Antenna Characterization for UAV Based GPS Jammer Localization
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2015.
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 at Institute of Navigation (ION) Positioning, Navigation and Timing Conference, Honolulu, Hawaii, April 2015.
Reid, Tyler G. R., Walter, Todd, Blanch, Juan A., and Enge, Per K.
GNSS Integrity in the Arctic
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2015.
* 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, pp. 30-38, May 2015.
Walter, Todd
GNSS Augmentations
Published in
Inside GNSS, Published October 15, 2015, October 2015.
2014
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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2014.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2014.
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 at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2014.
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 at IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California, May 2014.
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 at IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California, May 2014.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 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 No. 1, pp. 46-63, January 2014, 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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2014.
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 at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2014.
Lo, Sherman C., Chen, Yu-Hsuan, Zhang, Shiwen, and Enge, Per K.
Hybrid APNT: Terrestrial Radionavigation to Support Future Aviation Needs
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2014.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2014.
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 at European Navigation Conference (ENC GNSS 2014), Rotterdam, Netherlands, April 2014.
Phelts, R. Eric, Blanch, Juan A., Walter, Todd, and Enge, Per K.
The Effect of Nominal Signal Deformations on ARAIM User Performance
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2014.
Reid, Tyler G. R., Walter, Todd, Enge, Per K., and Fowler, Ananda
Crowdsourcing Arctic Navigation Using Multispectral Ice Classification & GNSS
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems (GNSS+) Conference, Tampa, Florida, September 2014.
* Best Presentation Award
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
Presented at the 27th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS+ 2014), Tampa, Florida, September 2014.
2013
Bang, Eugene, Lee, Jinsil, Lee, Jiyun, Seo, Jiwon, and Walter, Todd F.
Constructing Ionospheric Irregularity Threat Model for Korean SBAS
Presented at Institute of Navigation (ION) Pacific PNT Meeting, Honolulu, Hawaii, April 2013.
Blanch, Juan A., Walter, Todd, Phelts, R. Eric, and Enge, Per K.
Near Term Improvements to WAAS Availability
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2013.
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, pp. 53-69 2013.
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 at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2013.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2013.
Lee, Chiawei, 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 at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2013.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2013.
* Best Presentation Award
Phelts, R. Eric, Wong, Gabriel H. W., Walter, Todd, and Enge, Per K.
Signal Deformation Monitoring for Dual-Frequency WAAS
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2013.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2013.
Walter, Todd, Blanch, Juan A., Choi, Myungjun, Reid, Tyler G. R., and Enge, Per K.
Incorporating GLONASS into Aviation RAIM Receivers
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2013.
Walter, Todd, Blanch, Juan A., and Enge, Per K.
Implementation of the L5 SBAS MOPS
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2013.
2012
Azoulai, Laurent, Neri, Pierre, Milner, Carl, Macabiau, Christophe, and Walter, Todd F.
SBAS Error Modeling for Category I Autoland
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2012.
Bang, Eugene, Lee, Jiyun, Seo, Jiwon, Pullen, Samuel P., and Close, Sigrid
Automated Ionosphere Front Velocity Estimation Algorithm for Ground-Based Augmentation Systems
Presented at Institute of Navigation (ION) International Technical Meeting, Newport Beach, California, January 2012.
Blanch, Juan A., Walter, Todd, and Enge, Per K.
Optimal Positioning for Advanced RAIM
Presented at Institute of Navigation (ION) International Technical Meeting, Newport Beach, California, January 2012.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2012.
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, April 2012.
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. 13417-13440 2012.
Choi, Myungjun, Blanch, Juan A., Walter, Todd, Akos, Dennis M., and Enge, Per K.
Evaluation of Multi-constellation Advanced RAIM for Vertical Guidance Using GPS and GLONASS Signals with Multiple Faults
Presented at the 25th International Technical Meeting of The Satellite Division of the Institute of Navigation (ION GNSS 2012), Nashville, Tennessee, September 2012.
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. 221-230 2012, 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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 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 at Institute of Navigation (ION) International Technical Meeting, Newport Beach, California, January 2012.
Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K.
Automated Verification of Potential Signal-In-Space Anomalies Using Ground Observation Data
Presented at IEEE/ION Position Location and Navigation Symposium (PLANS), Monterey, California, May 2012.
Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K.
GLONASS Signal-in-Space Anomalies Since 2009
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2012.
* 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, October 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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2012.
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 at Institute of Navigation (ION) International Technical Meeting, Newport Beach, California, January 2012.
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, 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, Vol. 55 No. 1 2012.
Pullen, Samuel P., Gao, Grace Xingxin, Tedeschi, Carmen, and Warburton, John
The Impact of Uninformed RF Interference on GBAS and Potential Mitigations
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2012.
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 2012.
Sundlisæter, Tale, Reid, Tyler G. R., Johnson, Christopher, and Wan, Stephanie
GNSS and SBAS System of Systems: Considerations for Applications in the Arctic
Presented at 63rd International Astronautical Congress, Naples, Italy, 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, pp. 317-327 2012, 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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Nashville, Tennessee, September 2012.
2011
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2011.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2011.
Choi, Myungjun, Blanch, Juan A., Walter, Todd, and Enge, Per K.
Advanced RAIM Demonstration Using Four Months of Ground Data
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2011.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2011.
Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K.
Statistical Characterization of GPS Signal-In-Space Errors
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2011.
Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K.
Statistical Characterization of GLONASS Broadcast Ephemeris Errors
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2011.
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. 44-49, November 2011.
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, Published in 2011 2011.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2011.
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
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 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, Published in 2011 2011.
Thoelert, Steffen, Erker, Stefan, Furthner, Johann, Meurer, Michael, Gao, Grace Xingxin, Heng, Liang, Walter, Todd, and Enge, Per
First Signal in Space Analysis of GLONASS K-1
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2011.
Walter, Todd, Blanch, Juan A., Phelts, R. Eric, and Enge, Per K.
Evolving WAAS to Serve L1/L5 Users
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2011.
* 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 at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2011.
Wong, Gabriel H. W., Phelts, R. Eric, Walter, Todd, and Enge, Per K.
Bounding Errors Caused by Nominal GNSS Signal Deformations
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2011.
2010
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
Presented at DBSec 2010, the IFIP WG 11.3 Conference on Data and Applications Security, 2010.
Blanch, Juan A., Choi, Myungjun, Walter, Todd, Enge, Per K., and Suzuki, Kazushi
Prototyping Advanced RAIM for Vertical Guidance
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2010.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 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
AIAA Journal of Aircraft, Vol. 47 No. 4, pp. 1141-1151 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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2010.
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
Presented at International Civil Aviation Organization (ICAO) Navigation Systems Panel (NSP) Working Group Meetings, Montreal, Canada, May 2010.
Gao, Grace Xingxin, Heng, Liang, Wong, Gabriel, Phelts, Eric, 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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2010.
* Best Presentation Award
Heng, Liang, Gao, Grace Xingxin, Walter, Todd, and Enge, Per K.
GPS Ephemeris Error Screening and Results for 2006-2009
Presented at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2010.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2010.
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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 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 at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2010.
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 at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2010.
Lo, Sherman, Peterson, Benjamin, Hardy, Tim, and Enge, Per
Improving Loran Coverage with Low Power Transmitters
Published in
The Journal of Navigation, Vol. 63 No. 1, 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 at Institute of Navigation (ION) International Technical Meeting, San Diego, California, January 2010.
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
Presented at Royal Institute of Navigation, Westminster, London, UK, November-December 2010.
Phelts, R. Eric, Gao, Grace Xingxin, Wong, Gabriel H. W., Heng, Liang, Walter, Todd, Enge, Per K., Erker, Stafen, and Thoelert, Steffen
Aviation Grade: Chips off the Block IIF (Evaluating the IIF-1 for Aviation Users)
Published in
Inside GNSS 2010.
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
Presented at ENRI International Workshop on ATM/CNS, Tokyo, Japan, September 2010.
Qiu, Di, Boneh, Dan, Lo, Sherman, and Enge, Per
Reliable Location-Based Services from Radio Navigation Systems
Published in
Sensors, Vol. 10 No. 12, pp. 11369-11389, December 2010, DOI 10.3390/s101211369.
Suzuki, Kazushi, Pullen, Samuel P., Enge, Per K., and Ono, Takeshi
Evaluation of Dual-Frequency GBAS Performance Using Data from Public Receiver Networks
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2010.
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 at IEEE/ION Position Location and Navigation Symposium (PLANS), Indian Wells, California, May 2010.
Thoelert, Steffen, Erker, Stafen, Heng, Liang, Phelts, R. Eric, Gao, Grace Xingxin, Wong, Gabriel H. W., Walter, Todd, and Enge, Per
On the Air: New Signals from the First GPS IIF Satellite
Published in
Inside GNSS 2010.
Walter, Todd, Enge, Per, and Blanch, Juan A.
Future Augmented
Published in
GPS World, March 2010.
Wong, Gabriel H. W., Phelts, Eric, Walter, Todd, and Enge, Per K.
Characterization of Signal Deformations for GPS and WAAS Satellites
Presented at Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Portland, Oregon, September 2010.
2009
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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2009.
Blanch, Juan A., Mayer, Christoph, Lo, Sherman C., Walter, Todd, and Enge, Per K.
Hysteresis in RAIM
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2009.
* 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 at the Institute of Navigation (ION) International Technical Meeting, Anaheim, California, January 2009.
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 at the International Loran Association 38th Annual Meeting, Portland, Maine, October 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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2009.
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.
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., 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 at the International Loran Association 38th Annual Meeting, Portland, Maine, October 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 at the Institute of Navigation (ION) International Technical Meeting, Anaheim, California, January 2009.
Qiu, Di, Boneh, Dan, Lo, Sherman C., and Enge, Per K.
Robust Location Tag Generation from Noisy Location Data for Security Applications
Presented at the Institute of Navigation (ION) International Technical Meeting, Anaheim, California, January 2009.
Qiu, Di, Lo, Sherman C., De Lorenzo, David S., and Enge, Per K.
Pattern Classification for Geotag Generation
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2009.
2008
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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2008.
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 at the European Navigation Conference GNSS/Toulouse Space Show, Toulouse, France, April 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 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California, January 2008.
Hsu, Po-Hsin, Chiu, Timothy, Golubev, Yuri, and Phelts, R. Eric
Test Results for the WAAS Signal Quality Monitor
Presented at the IEEE/ION Position Location and Navigation Symposium, Monterey, California, May 2008.
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 at the European Navigation Conference GNSS/Toulouse Space Show, Toulouse, France, April 2008.
Konovaltsev, Andriy, De Lorenzo, David S., Hornbostel, Achim, and Enge, Per K.
Mitigation of Continuous and Pulsed Radio Interference with GNSS Antenna Arrays
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2008.
Lo, Sherman C., Wenzel, Robert, Johnson, Greg, and Enge, Per K.
Assessment of the Methodology for Bounding Loran Temporal ASF for Aviation
Presented at the Institute of Navigation (ION) National Technical Meeting, San Diego, California, January 2008.
Lo, Sherman C., Peterson, Benjamin B., Boyce, C. O. Lee, and Enge, Per K.
Loran Coverage Availability Simulation Tool
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2008.
Lo, Sherman C., Peterson, Benjamin B., Boyce, C. O. Lee, and Enge, Per K.
Loran Coverage Availability Simulation Tool
Presented at the Royal Institute of Navigation (RIN) NAV08/International Loran Association 37th Annual Meeting, Westminster, London, UK, October 2008. Slightly expanded version of the ION paper with the same title.
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 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California, January 2008.
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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 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 Proceedings of the IEEE, Vol. 96, No. 12, pp. 1958-1975, 2008.
Schroth, Georg, Ene, Alexandru, Blanch, Juan A., Walter, Todd, and Enge, Per K.
Failure Detection and Exclusion via Range Consensus
Presented at the European Navigation Conference GNSS/Toulouse Space Show, Toulouse, France, April 2008.
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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2008.
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 at the 12th International Ionospheric Effects Symposium, Alexandria, Virginia, May 2008.
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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Savannah, Georgia, September 2008.
Walter, Todd, Blanch, Juan A., Enge, Per K., Pervan, Boris S., and Gratton, Livio
Future Architectures to Provide Aviation Integrity
Presented at the Institute of Navigation (ION) National Technical Meeting, San Diego, California, January 2008.
Walter, Todd, Blanch, Juan, Enge, Per, Pervan, Boris, and Gratton, Livio
Shaping Aviation Integrity: Two RAIMs for Safety
Published in GPS World, Vol. 19, No. 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, No. 12, December 2008.
2007
Blanch, Juan A., Ene, Alex, Walter, Todd, and Enge, Per K.
An Optimized Multiple Hypothesis RAIM Algorithm for Vertical Guidance
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 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 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California, January 2007.
Datta-Barua, Seebany, Walter, Todd, Pullen, Samuel P., and Enge, Per K.
Modeling the 20 November 2003 Ionosphere Storm with GRACE
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 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 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland, May 2007.
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 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California, January 2007.
Gao, Grace Xingxin, Datta-Barua, Seebany, Walter, Todd, and Enge, Per K.
Ionosphere Effects for Wideband GNSS Signals
Presented at the Institute of Navigation (ION) Annual Meeting, Cambridge, Massachusetts, April 2007.
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 at the European Navigation Conference GNSS/TimeNav 2007, Geneva, Switzerland, May 2007.
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.
Kim, Euiho, Walter, Todd, and Powell, J. David
WAAS-Based Flight Inspection System
Presented at the Institute of Navigation (ION) Annual Meeting, Cambridge, Massachusetts, 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 at the International Loran Association 36th Annual Meeting, Orlando, Florida, October 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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 2007.
Qiu, Di, Lo, Sherman C., Peterson, Benjamin B., and Enge, Per K.
Geoencryption Using Loran
Presented at the Institute of Navigation (ION) National Technical Meeting, San Diego, California, January 2007.
Qiu, Di, Lo, Sherman C., and Enge, Per K.
Geoencryption with Loran
Presented at the International Loran Association 36th Annual Meeting, Orlando, Florida, October 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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 2007.
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 at the International Beacon Satellite Symposium, Boston, Massachusetts, June 2007.
Swaszek, Peter, Johnson, Gregory, Hartnett, Richard, and Lo, Sherman C.
An Investigation into the Temporal Correlation at the ASF Monitor Sites
Presented at the International Loran Association 36th Annual Meeting, Orlando, Florida, October 2007.
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 at the Institute of Navigation (ION) National Technical Meeting, San Diego, California, January 2007.
2006
Boyce, C. O. Lee, Lo, Sherman C., Powell, J. David, and Enge, Per K.
Mitigating Atmospheric Noise for Loran
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 2006.
* 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 at the International Loran Association 35th Annual Meeting, Groton, Connecticut, October 2006.
Datta-Barua, Seebany, Walter, Todd, Blanch, Juan A., and Enge, Per K.
Bounding Higher Order Ionosphere Errors for the Dual Frequency GPS User
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 2006.
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
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 2006.
* Best Presentation Award
Ene, Alexandru, Blanch, Juan A., and Walter, Todd F.
Galileo-GPS RAIM for Vertical Guidance
Presented at the Institute of Navigation National Technical Meeting, Monterey, California, January 2006.
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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 2006.
Kim, Euiho, Peled, Uri, Walter, Todd, and Powell, J. David
A Development of WAAS-Aided Flight Inspection Truth System
Presented at the IEEE/ION Position Location and Navigation Symposium, San Diego, California, April 2006.
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 at the Institute of Navigation National Technical Meeting, Monterey, California, January 2006.
Konno, Hiroyuki, Pullen, Samuel P., Rife, Jason H., and Enge, Per K.
Ionosphere Monitoring Methodology for Hybrid Dual-Frequency LAAS
Presented at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 2006.
Lee, Jiyun, Pullen, Samuel P., Datta-Barua, Seebany, and Enge, Per K.
Assessment of Nominal Ionosphere Spatial Decorrelation for LAAS
Presented at the IEEE/ION Position Location and Navigation Symposium, San Diego, California, April 2006.
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 at the Institute of Navigation (ION) Global Navigation Satellite Systems Conference, Fort Worth, Texas, September 2006.
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 at the IEEE/ION Position Location and Navigation Symposium, San Diego, California, April 2006.
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 Systems, 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 at the Institute of Navigation National Technical Meeting, Monterey, California, January 2006.
Walter, Todd and Enge, Per
The Wide-Area Augmentation System
Published in EGNOS: The European Geostationary Navigation Overlay System — A Cornerstone of Galileo, ESA Publications, 2006.
2005
Boyce, Lee, Lo, Sherman C., Powell, J. David, and Enge, Per K.
Noise Assessment and Mitigation for Loran for Aviation
Presented at the Institute of Navigation Annual Meeting, Cambridge, Massachusetts, June 2005.
Boyce, Lee, Lo, Sherman C., Powell, J. David, and Enge, Per K.
Atmospheric Noise: Data Collection and Analysis
Presented at the International Loran Association 34th Annual Meeting, Santa Barbara, California, October 2005.
Datta-Barua, Seebany, 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 at the Institute of Navigation Annual Meeting, Cambridge, Massachusetts, June 2005.
Datta-Barua, Seebany, Walter, Todd, Blanch, Juan A., and Enge, Per K.
Can WAAS Availability Be Inferred From Geomagnetic Data? An Analysis
Published in the Proceedings of the Ionospheric Effects Symposium 2005, Alexandria, Virginia, May 3-5, 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 at the Institute of Navigation GNSS Conference, Long Beach, California, September 2005.
Ene, Alexandru, Qiu, Di, Luo, Ming, Pullen, Samuel P., and Enge, Per K.
A Comprehensive Ionosphere Storm Data Analysis Method to Support LAAS Threat Model Development
Presented at the Institute of Navigation National Technical Meeting, San Diego, California, January 2005.
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.
Koenig, Michael, Rife, Jason H., Pullen, Samuel P., and Enge, Per K.
Optimizing Channel Selection for the JPALS Land-Based Integrity Monitor
Presented at the Institute of Navigation GNSS Conference, Long Beach, California, September 2005.
Konno, Hiroyuki, Pullen, Samuel P., Luo, Ming, and Enge, Per K.
Analysis of Ionosphere Gradient Using Japan GEONET Data
Presented at the Institute of Navigation National Technical Meeting, San Diego, California, January 2005.
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 at the Institute of Navigation GNSS Meeting, Long Beach, California, September 2005.
Rife, Jason H., Pullen, Samuel P., Walter, Todd, and Enge, Per K.
Vertical Protection Levels for a Local Airport Monitor for WAAS
Presented at the Institute of Navigation Annual Meeting, Cambridge, Massachusetts, June 2005.
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
Published in the Proceedings of the Ionospheric Effects Symposium, Alexandria, Virginia, 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 at the European Navigation Conference GNSS 2005, Munich, Germany, July 2005.
2004
Carroll, Kevin M., Hawes, Anthony, Peterson, Benjamin B., Dykstra, Kenneth, Swaszek, Peter, and Lo, Sherman C.
Differential Loran-C
Presented at the European Navigation Conference – GNSS 2004, Rotterdam, The Netherlands, May 2004.
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 at the Institute of Navigation GNSS Meeting, Long Beach, California, September 2004.
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 at the IEEE Position Location and Navigation Symposium, Monterey, California, April 2004.
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 at the Institute of Navigation GNSS Conference, Long Beach, California, September 2004.
* Best Presentation Award
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 at the IEEE Position Location and Navigation Symposium, Monterey, California, April 2004.
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 at the Institute of Navigation GNSS Conference, Long Beach, California, September 2004.
Luo, Ming, Pullen, Samuel P., Walter, Todd, and Enge, Per K.
Ionosphere Spatial Gradient Threat for LAAS: Mitigation and Tolerable Threat Space
Presented at the Institute of Navigation National Technical Meeting, San Diego, California, January 2004.
Luo, Ming, Pullen, Samuel P., Ene, Alexander, Qiu, Di, Walter, Todd, and Enge, Per K.
Ionosphere Threat to LAAS: Updated Model, User Impact, and Mitigations
Presented at the Institute of Navigation GNSS Conference, Long Beach, California, September 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 at the Institute of Navigation National Technical Meeting, San Diego, California, January 2004.
Rife, Jason H., Pullen, Samuel P., Pervan, Boris S., and Enge, Per K.
Paired Overbounding and Application to GPS Augmentation
Presented at the IEEE Position Location and Navigation Symposium, Monterey, California, April 2004.
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 at the Institute of Navigation National Technical Meeting, San Diego, California, January 2004.
Walter, Todd, Enge, Per K., and Reddan, Pat
Modernizing WAAS
Presented at the Institute of Navigation GNSS Meeting, Long Beach, California, September 2004.
Walter, Todd, Rajagopal, Sriram, Datta-Barua, Seebany, and Blanch, Juan A.
Protecting Against Unsampled Ionospheric Threats
Presented at the Beacon Satellite Symposium, Trieste, Italy, October 2004.
2003
Alban, Santiago, Akos, Dennis M., Rock, Stephen M., and Gebre-Egziabher, Demoz
Performance Analysis and Architectures for INS-Aided GPS Tracking Loops
Presented at the Institute of Navigation National Technical Meeting, Anaheim, California, January 2003.
Datta-Barua, Seebany, Doherty, Patrick, Delay, Susan, Dehel, Thomas, and Klobuchar, John
Ionospheric Scintillation Effects on Single and Dual Frequency GPS Positioning
Presented at the Institute of Navigation GPS/GNSS Meeting, Portland, Oregon, September 2003.
Gebre-Egziabher, Demoz, Jr., Boyce, C. O. Lee, 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.
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 at the Institute of Navigation National Technical Meeting, Anaheim, California, January 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.
2002
Bauregger, Frank N., Walter, Todd, Akos, Dennis M., and Enge, Per K.
A Novel Dual-Patch Anti-Jam GPS Antenna
Presented at the Institute of Navigation Annual Meeting, Albuquerque, New Mexico, June 2002.
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.
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 at the Institute of Navigation National Technical Meeting, San Diego, California, January 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 at the Institute of Navigation National Technical Meeting, San Diego, California, January 2002.
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 at the 21st 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 at the Institute of Navigation GPS Meeting, Portland, Oregon, September 2002.
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 at the Institute of Navigation Annual Meeting, Albuquerque, New Mexico, June 2002.
Mitelman, Alexander M., Akos, Dennis M., Pullen, Samuel P., and Enge, Per K.
Estimation of ICAO Threat Model Parameters for Operational GPS Satellites
Presented at the Institute of Navigation GPS Meeting, Portland, Oregon, September 2002.
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 at the Institute of Navigation GPS Meeting, Portland, Oregon, September 2002.
Opshaug, Guttorm
Leapfrog Navigation System
Presented at the Institute of Navigation GPS Meeting, Portland, Oregon, September 2002.
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 at the 3rd International Symposium on Integration of LORAN-C/Eurofix and EGNOS/Galileo, Munich, Germany, June 2002.
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 at the Institute of Navigation GPS Meeting, Portland, Oregon, September 2002.
Pullen, Samuel P., Walter, Todd, and Enge, Per K.
System Overview, Recent Developments, and Future Outlook for WAAS and LAAS
Presented at the Tokyo University of Mercantile Marine GPS Symposium, Tokyo, Japan, November 11-13, 2002.
Schloss, Peter, Phelts, R. Eric, Walter, Todd, and Enge, Per K.
A Simple Method of Signal Quality Monitoring for WAAS LNAV/VNAV
Presented at the Institute of Navigation GPS Meeting, Portland, Oregon, September 2002.
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 at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2001.
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 at the International Conference on Integrated Navigation Systems, St. Petersburg, Russia, May 2001.
Jan, Shau-Shiun, Chan, Wyant, Walter, Todd, and Enge, Per K.
Matlab Simulation Toolset for SBAS Availability Analysis
Presented at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2001.
Lee, Jiyun, Pullen, Samuel P., Xie, Gang, and Enge, Per K.
LAAS Sigma-Mean Monitor Analysis and Failure-Test Verification
Presented at the Institute of Navigation Annual Meeting, Albuquerque, New Mexico, June 2001.
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 at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2001.
* 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 at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 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 at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2001.
* 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 at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 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 at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2001.
Walter, Todd, Hansen, Andrew J., and Enge, Per K.
Message Type 28
Presented at the ION National Technical Meeting, Long Beach, California, January 2001.
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 at the Institute of Navigation Annual Meeting, Albuquerque, New Mexico, June 2001.
2000
Akos, Dennis M., Normark, Per-Ludvig, Lee, Jeong-Tack, Gromov, Konstantin, Tsui, James B. Y., and Schamus, John
Low Power Global Navigation Satellite System (GNSS) Signal Detection and Processing
Presented at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2000.
Gromov, Konstantin, Akos, Dennis M., Pullen, Samuel P., Enge, Per K., and Parkinson, Bradford W.
GIDL: Generalized Interference Detection and Localization System
Presented at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2000.
Hansen, Andrew J., Peterson, Eric, Walter, Todd, and Enge, Per K.
Correlation Structure of Ionospheric Estimation and Correlation for WAAS
Presented at the Institute of Navigation National Technical Meeting, Anaheim, California, January 2000.
Hansen, Andrew J., Blanch, Juan A., Walter, Todd, and Enge, Per K.
Ionospheric Correlation Analysis for WAAS: Quiet and Stormy
Presented at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2000.
Lo, Sherman C. and Enge, Per K.
Data Transmission Using LORAN-C
Presented at the 29th Annual Convention and Technical Symposium of the International Loran Association, Washington, D.C., November 2000.
Luo, Ming, Akos, Dennis M., Pullen, Samuel P., and Enge, Per K.
Interference to GPS from UWB Transmitters
Presented at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2000.
* 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 at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2000.
* 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 at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2000.
* Best Presentation Award
Phelts, R. Eric and Enge, Per K.
The Case for Narrowband Receivers
Presented at the Institute of Navigation National Technical Meeting, Anaheim, California, January 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 Platforms
Presented at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2000.
Walter, Todd, Hansen, Andrew J., Blanch, Juan A., and Enge, Per K.
Robust Detection of Ionospheric Irregularities
Presented at the Institute of Navigation GPS Conference, Salt Lake City, Utah, September 2000.
* Best Presentation Award
1999
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 at the SPIE Enhanced and Synthetic Vision Conference, Orlando, Florida, April 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 at the ION National Technical Meeting, San Diego, California, January 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 at the ION National Technical Meeting, San Diego, California, January 1999.
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 at the ION National Technical Meeting, San Diego, California, January 1999.
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 at the Institute of Navigation GPS Conference, Nashville, Tennessee, September 1999.
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 at the ION GPS Conference, Nashville, Tennessee, September 1999.
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 at the ION GPS Conference, Nashville, Tennessee, September 1999.
Li, Jie, Ndili, Awele, Ward, Lisa, and Buchman, Saps
GPS Receiver Satellite/Antenna Selection Algorithm for the Stanford Gravity Probe B Relativity Mission
Presented at the ION National Technical Meeting, San Diego, California, January 1999.
Phelts, R. Eric, Stone, Jonathan M., Enge, Per K., and Powell, J. David
Software-Based Multipath Mitigation: Sampling for Multipath Invariance
Presented at the 4th International Symposium on Satellite Navigation Technology and Applications, Brisbane, Australia, July 1999.
Stone, Jonathan M., LeMaster, Edward A., Powell, J. David, and Rock, Stephen M.
GPS Pseudolite Transceivers and Their Applications
Presented at the ION National Technical Meeting, San Diego, California, January 1999.
1998
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 at the ION GPS Conference, Nashville, Tennessee, September 1998.
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 at ION GPS '98, Nashville, Tennessee, September 1998.
Hayward, Roger C., Gebre-Egziabher, Demoz, and Powell, J. David
GPS-Based Attitude for Aircraft
Presented at the International Conference on Integrated Navigation Systems, St. Petersburg, Russia, May 1998.
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
Published in 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
Published in 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.
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 at the ION GPS Conference, Kansas City, Missouri, September 1997.
Breivik, K., Forssell, B., Kee, C., Enge, P., and Walter, T.
Estimation of Multipath Error in GPS Pseudorange Measurements
Published in NAVIGATION, Vol. 44, No. 1, Spring 1997, pp. 43-52, DOI 10.1002/j.2161-4296.1997.tb01938.x.
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 at the ION GPS Conference, Kansas City, Missouri, September 1997.
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 at the ION GPS Conference, Kansas City, Missouri, September 1997.
Evans, Jennifer D., Elkaim, Gabriel H., Lo, Sherman C., and Parkinson, Bradford W.
System Identification of an Autonomous Aircraft Using GPS
Presented at the 10th International Technical Meeting of The Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, Missouri, September 1997, pp. 1065-1071.
Hansen, Andrew J., Chao, Yi-Chung, Walter, Todd, and Enge, Per K.
Ionospheric Estimation and Integrity Threat Detection
Presented at ION NTM '97, Santa Monica, California, January 1997.
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 at the ION GPS Conference, Kansas City, Missouri, September 1997.
Kee, Changdon, Walter, Todd, Enge, Per, and Parkinson, Bradford
Quality Control Algorithms on WAAS Wide-Area Reference Stations
Published in NAVIGATION, Vol. 44, No. 1, Spring 1997, pp. 53-62, DOI 10.1002/j.2161-4296.1997.tb01939.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.
Development, Implementation, and Testing of a Prototype LAAS Architecture
Presented at GNSS-97, Munich, Germany, April 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 at the ION GPS Conference, Kansas City, Missouri, September 1997.
Walter, Todd, Enge, Per K., and Hansen, Andrew J.
A Proposed Integrity Equation for WAAS MOPS
Presented at the 10th International Technical Meeting of The Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, Missouri, September 1997, pp. 475-484.
* Best Presentation Award
1996
Barrows, Andrew K., Enge, Per K., Parkinson, Bradford W., and Powell, J. David
Evaluation of a Perspective-View Cockpit Display for General Aviation Using GPS
Published in 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 at the ION GPS Conference, Kansas City, Missouri, September 1996.
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 at IEEE Emerging Technologies and Factory Automation '96, Kauai, Hawaii, November 1996.
Chao, Yi-Chung, Pullen, Samuel P., Enge, Per K., and Parkinson, Bradford W.
Study of WAAS Ionospheric Integrity
Presented at the 9th International Technical Meeting of The Satellite Division of The Institute of Navigation (ION GPS 1996), Kansas City, Missouri, September 1996, pp. 781-788.
Conway, Andrew, Montgomery, Paul Y., Rock, Stephen M., Cannon, Robert, and Parkinson, Bradford W.
A New Motion-Based Algorithm for GPS Attitude Integer Resolution
Published in NAVIGATION, Vol. 43, No. 2, Summer 1996, pp. 191-202, 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 at the ION GPS Conference, Kansas City, Missouri, September 1996.
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.
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 at the ION GPS Conference, Kansas City, Missouri, September 1996.
O'Connor, Michael L., Elkaim, Gabriel H., and Parkinson, Bradford W.
Carrier Phase DGPS for Closed-Loop Control of Farm and Construction Vehicles
Published in 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 at the 3rd International Conference on Precision Agriculture, Minneapolis, Minnesota, June 1996.
Pullen, Samuel P., Pervan, Boris S., Enge, Per K., and Parkinson, Bradford W.
A Comprehensive Integrity Verification Architecture for On-Airport LAAS Category III Precision Landing
Presented at the ION GPS Conference, Kansas City, Missouri, September 1996.
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 at the American Astronautical Society Guidance, Navigation and Control Conference, Breckenridge, Colorado, February 1996.
1995
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 at ION GPS, Palm Springs, California, September 1995.
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., and Parkinson, Bradford W.
The Ionospheric Model Improvement for the Stanford WAAS Network
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at the Institute of Navigation National Technical Meeting, Anaheim, California, January 1995, and the AAS Guidance and Control Conference, Keystone, Colorado, February 1995.
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
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at ION GPS, Palm Springs, California, September 1995.
Cobb, H. Stewart, Lawrence, David G., Pervan, Boris S., Cohen, Clark E., Powell, J. David, and Parkinson, Bradford W.
Precision Landing Tests with Improved Integrity Beacon Pseudolites
Presented at ION GPS, Palm Springs, California, September 1995.
Cobb, H. Stewart, Lawrence, David G., Christie, Jock R. I., Walter, Todd, Chao, Yi-Chung, Powell, J. David, and Parkinson, Bradford W.
Observed GPS Signal Continuity Interruptions
Presented at ION GPS, Palm Springs, California, September 1995.
Cohen, Clark E., Cobb, H. Stewart, Lawrence, David G., Pervan, Boris S., et al.
Automatic Landing of a 737 Using GNSS Integrity Beacons
Presented at ISPA, Braunschweig, Germany, February 1995.
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 at the 51st Institute of Navigation Annual Meeting, Colorado Springs, Colorado, June 1995.
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
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at ION GPS, Palm Springs, California, September 1995.
Parkinson, Bradford W., Stansell, Thomas, Beard, Ronald, and Gromov, Konstantin
A History of Satellite Navigation
Published in NAVIGATION, Journal of the Institute of Navigation, Vol. 42, No. 1, Special Issue, Spring 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 at ISPA, Braunschweig, Germany, February 1995.
Teague, E. Harrison, How, Jonathan P., Lawson, London G., and Parkinson, Bradford W.
GPS as a Structural Deformation Sensor
Presented at 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
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at the Institute of Navigation National Technical Meeting, Anaheim, California, January 1995, and the AAS Guidance and Control Conference, Keystone, Colorado, February 1995.
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, California, September 1995, pp. 661-670.
1994
Cobb, H. Stewart, Cohen, Clark E., and Parkinson, Bradford W.
Theory and Design of Pseudolites
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at the Institute of Navigation National Technical Meeting, San Diego, California, January 1994.
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 at DSNS-94, London, United Kingdom, April 1994.
Cohen, Clark E., Lightsey, E. Glenn, Parkinson, Bradford W., and Feess, William A.
Space Flight Tests of Attitude Determination Using GPS
Published in International Journal of Satellite Communications, Vol. 12, pp. 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
Published in 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
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at ION GPS '94, Salt Lake City, Utah, September 1994.
Lightsey, E. Glenn, Cohen, Clark E., Feess, William A., and Parkinson, Bradford W.
Analysis of Spacecraft Attitude Measurements Using Onboard GPS
Presented at the AAS Conference, Keystone, Colorado, February 1994.
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
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at ION GPS '94, Salt Lake City, Utah, September 1994.
Walter, Todd, Pervan, Boris S., Enge, Per K., Herendeen, John, and Levin, Peter L.
Autonomous Integrity Monitoring and Wide Area DGPS
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at the ION National Technical Meeting, San Diego, California, January 1994.
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 at ION GPS 1994, Salt Lake City, Utah, September 1994.
1993
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 at the Second International Symposium on Differential Satellite Navigation Systems, Amsterdam, The Netherlands, March 1993.
Cohen, Clark E., Pervan, Boris S., 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
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at ION GPS '93, Salt Lake City, Utah, September 1993.
Cohen, Clark E., Lightsey, E. Glenn, Parkinson, Bradford W., and Feess, William A.
Space Flight Tests of Attitude Determination Using GPS: Preliminary Results
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at ION GPS '93, Salt Lake City, Utah, September 1993.
1992
1991
1990 and Earlier
Kee, Changdon, Parkinson, Bradford W., and Axelrad, Penina
Wide Area Differential GPS
Published in NAVIGATION, Journal of the Institute of Navigation. Presented at the Institute of Navigation Satellite Division 3rd International Technical Meeting, Colorado Springs, Colorado, September 1990.
* Outstanding Paper Award
Parkinson, Bradford W. and Fitzgibbon, Kevin T.
Aircraft Automatic Landing Systems Using GPS
(Invited paper) Published in the Proceedings of the International Congress of Navigation Societies, Sydney, Australia, February 1988.
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, Vols. 165-166, Part 1, pp. 155-156, 1990.
