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Session C3: Frontiers of Radionavigation: Signals of Opportunity, 5G, LEO, and Beyond

Analysis of Time-Diverse Doppler-only LEO PNT
Megan O. Moore, Mark L. Psiaki, and R. Michael Buehrer, Virginia Tech
Location: Grand Ballroom IJ
Date/Time: Wednesday, Apr. 30, 10:40 a.m.

Due to concerns over GNSS jamming and spoofing, this paper considers time-diverse Doppler-only positioning as an alternative to GNSS. Without the use of time-diversity the Doppler-only positioning solution requires at least eight satellites to be in view simultaneously and discards previous Doppler measurements. In cases where fewer than eight satellites are available, using Doppler measurements from multiple points in time allows a complete solution to be determined. In cases where eight or more are available, using additional time-samples can further improve positioning accuracy. This work further analyzes batch-filter and Kalman filter solutions proposed in prior work and proposes the use of the Backwards Smoothing Extended Kalman filter (BSEKF) to solve the positioning problem.
Index Terms—low-Earth orbit, Doppler positioning

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