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About Todd Walter

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Todd Walter is a research professor in the Department of Aeronautics and Astronautics at Stanford University.

Posts by Todd Walter

Innovation: Monitoring GNSS interference and spoofing — a low-cost approach Posted on 17 Aug 2022 in the Featured Stories & From the Magazine & Innovation categories.

A team of researchers from Stanford University and the University of Colorado describe how they are using relatively inexpensive equipment and sophisticated software and analyses to detect and warn of GNSS jamming and spoofing. Read more»

Innovation: Ionospheric corrections for precise point positioning Posted on 01 Aug 2021 in the From the Magazine & Innovation categories.

How Good Are They?Stanford University and Hexagon are investigating the utility of applying ionospheric corrections to decrease the overall convergence time of precise point positioning (PPP). This article looks at the level of accuracy that can be achieved, the latency of corrections supplied in real-time PPP, as well as the location and coverage of the network of stations required to determine the corrections. Read more»

Innovation: Navigation from LEO Posted on 30 Jun 2017 in the Featured Stories & From the Magazine & GNSS & Innovation categories.

Current Capability and Future Promise
GPS signals are so weak, they cannot be used reliably where they are obstructed such as indoors or in concrete canyons. But if the satellites were much closer, their signals would be much stronger. The low Earth orbit Iridium constellation is already orbiting, and providing a PNT service. This month we learn about its current capability and future promise. Read more»