ION Webinars

ION Webinars provide timely, engaging presentations on topics of interest to the PNT community.

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Upcoming Webinars

Upcoming webinars will be posted here and on ION social media accounts.

Low-Cost Inertial Aiding for Deep-Urban Tightly Coupled Multi-Antenna Precise GNSS
Date: Tuesday, April 18, 12:00 p.m. EDT
Presenters: Dr. Todd E. Humphreys, The University of Texas at Austin

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Signal quality monitoring (SQM) is a technique utilized by satellite- and ground-based augmentation systems (SBAS/GBAS) to detect potential hazardous deformations in signals and better protect integrity for safety-critical users. The next generation of SBASs will incorporate dual-frequency multi-constellation (DFMC) techniques, for which SQM is particularly important since signal deformations might be the largest source of uncertainty in ranging error after first-order ionospheric delays are eliminated. However, the performance bounds of the traditional multi-correlator-based SQM technique face some challenges because of the raised requirement on detection sensitivity by dual-frequency ionosphere-free measurements and multiple modulation modes of civilian signals from multi-constellation techniques. To mitigate the challenges and improve overall performance, SQM based on chip domain observables (CDOs) is emerging, but has not yet been systematically studied. We propose a design methodology for CDO-based SQM, consisting of derivations and corresponding massive simulations. Correctness and effectiveness are assessed to confirm the methodology, and a simplification process by checking the sensitivity of CDOs is demonstrated in terms of implementation.

 

Improved GPS-Based Single-Frequency Orbit Determination for the CYGNSS Spacecraft Using GipsyX
Date: Wednesday, May 24, 12:00 p.m. EDT
Presenters: Dr. Penina Axelrad and Alex Conrad

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This webinar presents methods for the precise orbit determination (POD) of a satellite in the CYGNSS constellation based on available single-frequency GPS code and carrier measurements. The contributions include the development and evaluation of procedures for single-frequency POD with GipsyX, improvement of CYGNSS orbit knowledge, and an assessment of its final accuracy. Ionospheric effects are mitigated using the GRAPHIC processing method, and spacecraft multipath effects are calibrated with an azimuth/elevation-dependent antenna calibration map. The method is demonstrated using comparable data from the GRACE mission, from which we infer the expected accuracy of the CYGNSS results. Processing more than 170 days of data from each mission, a 1s CYGNSS orbit accuracy of 2.8 cm radial, 2.4 cm cross-track, and 6 cm in-track is demonstrated. We expect that achieving this level of performance will expand the set of future scientific investigations that can be undertaken using satellites equipped with single-frequency GNSS.

 

Webinar Archive

Webinar	Title	Presented By
2023
March 9	Signal Quality Monitoring Based on Chip Domain Observables: Theory, Design, and Implementation	Prof. Xiaowei Cui and Prof. Mingquan Lu
February 27	Navigating the Suez Canal	Captain Morgan McManus
February 15	Resilience Monitoring for Multi-Filter All-Source Navigation Framework With Assurance	Major Jonathon Gipson, PhD
January 11	Commercial GNSS Radio Occultation on Aerial Platforms with Off-the-Shelf Receivers	Bryan Chan
2022
December 8	Detecting GNSS Jamming and Spoofing on Android Devices	Dr. Dennis Akos
November 15	Characterization and Performance Assessment of BeiDou-2 and BeiDou-3 Satellite Group Delays	Dr. Oliver Montenbruck
October 27	Impact of GNSS-Band Radio Interference on Operational Avionics	Dr. Michael Felux and Dr. Okuary Osechas
August 4	Mapping Bit to Symbol Unpredictability with Application to Galileo Open Service Navigation Message Authentication	Dr. Cillian O’Driscoll and Dr. Ignacio Fernández-Hernández
July 13	National Strategy for Ocean Mapping	Meredith Westington and CDR Briana Hillstrom
June 16	WAAS and the Ionosphere – A Historical Perspective: Monitoring Storms	Dr. Lawrence Sparks
April 27	Results on GNSS Spoofing Mitigation Using Multiple Receivers	Dr. Gustaf Hendeby
March 30	Urban positioning: 3D mapping-aided GNSS using dual-frequency pseudorange measurements from smartphones	Hoi-Fung Ng
Feb. 22	Using GPS Data to Understand the Relationship Between Mobility Behavior and Well-Being	Dr. Gabriella M. Harari
Feb. 7	First results from three years of GNSS interference monitoring from low Earth orbit	Dr. Todd E. Humphreys and Dr. Lakshay Narula
2021
December 14	Navigation using carrier Doppler shift from a LEO constellation: TRANSIT on steroids	Mark L. Psiaki
November 18	Data-driven protection levels for camera and 3D map-based safe urban localization	Shubh Gupta
October 28	Air Data Fault Detection and Isolation for Small UAS Using Integrity Monitoring Framework	Kerry Sun
October 18	How Insect Brains Perform Dead Reckoning	Dr. Barbara Webb
September 14	Performance assessment of GNSS diffraction models in urban areas	Guohao Zhang and Dr. Li-Ta Hsu
August 17	Overbounding the effect of uncertain Gauss-Markov noise in Kalman filtering	Dr. Steve Langel
July 23	GNSS Spoofing Detection through Spatial Processing	Dr. Fabian Rothmaier
June 28	Factor Graph Optimization for GNSS/INS Integration: A Comparison with the Extended Kalman Filter	Dr. Li-Ta Hsu
June 15	GAO Report, “Defense Navigation Capabilities”	Chi Mai and Jenn Beddor, U.S. GAO
May 27	Hurricane Hunters: Navigating a Plane through a Hurricane	Lt. Cmdr. Brian Richards
May 11	Multi‐slices navigation approach for unknown 3D environments using micro aerial vehicles	Dr. Haytham Mohamed
April 20	GNSS interference mitigation: A measurement and position domain assessment	Dr. Daniele Borio and Dr. Ciro Gioia
March 23	Navigation of the Mars 2020 Perseverance Rover from Earth to Jezero Crater	Dr. Gerhard Kruizinga
February 18	Effect of GPS III weighted voting on P(Y) receiver processing performance	Dr. Karl Kovach
2020
December 10	Automatic detection of ionospheric scintillation-like GNSS satellite oscillator anomaly using a machine-learning algorithm	Yunxiang (Leo) Liu and Dr. Y. Jade Morton
November 12	Residual-based multi-filter methodology for all-source fault detection, exclusion, and performance monitoring	Dr. Juan Jurado
October 22	Relative navigation of fixed-wing aircraft in GPS-denied environments	Dr. Kevin Brink
August 20	Multi-Constellation ARAIM Exploiting Satellite Motion	Dr. Mathieu Joerger
July 9	Improving Environment Detection by Behavior Association for Context-Adaptive Navigation	Dr. Han Gao
June 25	When GNSS fails, what will you do? MarRINav! Co-sponsored by ION, the Resilient Navigation and Timing Foundation, and the Royal Institute of Navigation	Jonathan Turner, Alan Grant and Dana Goward
May 28	Impact of Sample Correlation on SISRE Overbound for ARAIM	Dr. Santiago Perea
April 16	Flight Results of GPS-Based Attitude Determination for the Canadian CASSIOPE Satellite	Dr. André Hauschild
March 5	Gaussian-Pareto Overbounding of DGNSS Pseudoranges from CORS	Dr. Jordan D. Larson
2019
December 5	LTE Receiver Design and Multipath Analysis for Navigation in Urban Environments	Kimia Shamaei and Zak Kassas