Monday, September 8: 1:30 p.m. - 3:00 p.m.
Masters Course GPS/GNSS 101	Dr. John Raquet
Masters Course Space Applications of GNSS	Dr. Penina Axelrad
Masters Course Signals of Opportunity Based Navigation	Dr. Christian Gentner
Monday, September 8: 3:30 p.m. - 5:00 p.m.
Masters Course GNSS Jamming and Spoofing – LEO as Fallback	Dr. Todd E. Humphreys
Masters Course Ionsopheric Effects	Dr. Jade Morton
Masters Course Indoor Positioning and Indoor Navigation (IPIN) Systems	Dr. Li-Ta Hsu

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Masters Course

GPS/GNSS 101

Date/Time: Monday, September 8, 1:30 p.m. - 3:00 p.m.

This course presents the fundamentals of the GPS, and other GNSS, and is intended for people with a technical background who do not have significant GPS experience. Topics covered include time-of-arrival positioning, overall system design of GPS, signal structure, error characterization, dilution of precision (DOP), differential GPS, GPS modernization, and other GNSS systems.

Dr. John Raquet is currently the director of IS4S-Dayton. Previously, he was the founding director of the Autonomy and Navigation Technology (ANT) Center at AFIT. He has published over 170 navigation-related conference and journal papers and taught 60 navigation-related short courses to over 3600 students in many organizations. He was winner of the 2024 Satellite Division Kepler Award, and is an ION Fellow and past president. Dr Raquet holds a BS in Astronautical Engineering from the USAFA, an MS in Aero/Astro Engineering from MIT, and a PhD in Geomatics Engineering from the University of Calgary.

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Masters Course

Space Applications of GNSS

Date/Time: Monday, September 8, 1:30 p.m. - 3:00 p.m.

GNSS receivers have become standard equipment for near-earth satellites, providing the onboard position, velocity, and timing information required to support real-time operations. Furthermore, precise GNSS observations from both direct and indirect paths collected onboard these platforms are used to support scientific and commercial purposes including characterization of Earth’s atmosphere, measurement of ocean surface heights, and extraction of time varying features of Earth’s gravity field. New advances in receiver technology and detailed modeling of the environmental influences on GNSS satellites and signals continue to expand the utility of GNSS to ever finer orbit resolution, and higher altitude missions – even to the point of being planned to support lunar exploration missions. This short course will present an overview of the many applications of GNSS in space, and describe the unique challenges and requirements for its use in the space environment.

Dr. Penina Axelrad is Joseph T. Negler Professor of Aerospace Engineering Sciences at the University of Colorado Boulder. Her research interests include technology and algorithms for position, navigation, timing, and remove sensing – especially in spaceborne applications. She is a past ION president, a Fellow of ION and AIAA, and a member of the National Academy of Engineering.

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Masters Course

Signals of Opportunity Based Navigation

Date/Time: Monday, September 8, 1:30 p.m. - 3:00 p.m.

Signals of Opportunity (SoO) refers to utilizing existing signals, such as radio, television, or cellular transmissions, for navigation or timing without requiring specialized transmitters. SoO can complement, or back-up, Global Navigation Satellite Systems (GNSSs) and other dedicated positioning systems to fulfil the challenging positioning performance requirements of innovative applications, such as high-accuracy indoor positioning, autonomous driving or Urban Air Mobility (UAM). This lecture provides a comprehensive introduction to the fundamentals and principles of SoO-based navigation, leveraging cutting-edge technologies such as 5G networks. Through practical examples, including indoor positioning utilizing Simultaneous Localization and Mapping (SLAM), we demonstrate the application and effectiveness of SoOs in navigation.

Dr. Christian Gentner is working at the Institute of Communications and Navigation of the German Aerospace Center (DLR) where he directs the multimodal personal navigation group. His research focuses on sensor fusion, urban and indoor positioning.

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Masters Course

GNSS Jamming and Spoofing – LEO as Fallback

Date/Time: Monday, September 8, 3:30 p.m. - 5:00 p.m.

Intentional jamming and spoofing of GNSS signals is by now a widespread phenomenon. Especially common near conflict regions, but not limited to these, such interference erodes trust in GNSS and compromises safety in air and marine travel and shipping. This tutorial will examine: 1) patterns of GNSS interference across the globe; 2) its effects on GNSS receivers; and 3) techniques for its detection, source geolocation, and mitigation. The tutorial will highlight cooperative and non-cooperative use of signals from low-Earth-orbit (LEO) mega-constellations as an especially promising fallback strategy. Compared to traditional GNSS, LEO constellations offer higher power, wider bandwidth, more rapid multipath decorrelation, and the possibility of stronger authentication and zero-age-of-ephemeris, all of which will enable greater accuracy and greater resilience against jamming and spoofing.

Dr. Todd E. Humphreys holds the Ashley H. Priddy Centennial Professorship in Engineering in the department of Aerospace Engineering and Engineering Mechanics at the University of Texas at Austin. He is director of the Wireless Networking and Communications Group and of the UT Radionavigation Laboratory, where he specializes in the application of optimal detection and estimation techniques to positioning, navigation, and timing. His awards include the UT Regents' Outstanding Teaching Award, the NSF CAREER Award, the ION Thurlow Award, the PECASE, and the ION Kepler award. He is Fellow of the ION and of the RIN. He holds a BS and MS from USU and PhD from Cornell.

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Masters Course

Ionsopheric Effects

Date/Time: Monday, September 8, 3:30 p.m. - 5:00 p.m.

Ionospheric effects are major threats to the availability, continuity, and accuracy of GNSS solutions. Models, global networks of GNSS stations, and LEO satellite-based radio occultation constellations have been established to monitor and predict the ionospheric effects. This lecture will present an overview of the current state-of-art understanding of the various ionospheric effects on GNSS-based navigation systems and their mitigation techniques including: a review of the fundamental properties of the ionosphere that impact satellite navigation signals; the ionospheric refractive effects; ionospheric scintillation effects; and an overview of the latest developments in ionospheric effects monitoring, worldwide GNSS observations, as well as the ionospheric effects on signals transmitted from LEO satellites.

Dr. Jade Morton is Helen and Hubert Croft Professor in the Aerospace Engineering Sciences Department at the University of Colorado, Boulder. Her research interests lie at the intersection of satellite navigation technologies and remote sensing of Earth’s ionosphere, atmosphere, and surface. Dr. Morton was a president and Satellite Division Chair of ION, and a recipient of ION Thurlow, Burka, Kepler, IEEE PLANS Kershner, and AGU SPARC award. She is a Fellow of IEEE, ION, and RIN.

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Masters Course

Indoor Positioning and Indoor Navigation (IPIN) Systems

Date/Time: Monday, September 8, 3:30 p.m. - 5:00 p.m.

This course provides an overview of indoor positioning and indoor navigation (IPIN) systems, focusing on those designed for applications based on smart devices. Starting from the markets and applications using IPIN, the course will discuss the selection of sensors and technologies based on the requirements (and limitations) set by applications. The methodologies of a state-of-the-art radio frequency (RF)-based positioning method will be introduced in detail. Some pedestrian dead reckoning and sensor fusion algorithms will be covered. Finally, the development trend of the RF-based indoor positioning method will be discussed.

Dr. Li-Ta Hsu, born in Taiwan, is currently an Associate Professor at The Hong Kong Polytechnic University (PolyU). In 2023, he was a visiting research scientist at Google. He is an associate editor of NAVIGATION: Journal of the Institute of Navigation. His research interests are urban positioning and navigation for IoT and robotics applications.

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