Meeting Modern Timing Demands with LEO Satellite Signals and Long Baseline Phase Interferometry

Landon Boyd and David M. Bevly

Peer Reviewed

Abstract:	A method for estimating a receiver’s clock bias and drift during a Global Navigation Satellite System (GNSS) outage is presented. This method is based on an interferometric receiver that uses observables from Low Earth Orbit (LEO) satellite vehicles (SVs) to estimate SV position and user clock bias. The interferometric receiver at a known location differences LEO measurements across multiple antennas to provide Angle of Arrival (AoA) estimates for SVs, as well as non-cooperative pseudoranges for state estimation. A complete measurement model for the system is developed and presented. Clock estimation performance of the receiver is assessed through Monte Carlo simulations, where the varied parameters are baseline length of the antenna array, carrier to noise density ratio (C/N0) of the received signal, and quality of oscillator used by the receiver. Using an antenna spacing of 20 meters, an equipped OCXO, and assuming a C/N0 of 85 dB-Hz, it is found that the receiver maintains sufficient timing accuracy to meet various modern timing demands, namely, 1us accuracy.
Published in:	Proceedings of the ION 2024 Pacific PNT Meeting April 15 - 18, 2024 Hilton Waikiki Beach Honolulu, Hawaii
Pages:	293 - 304
Cite this article:	Boyd, Landon, Bevly, David M., "Meeting Modern Timing Demands with LEO Satellite Signals and Long Baseline Phase Interferometry," Proceedings of the ION 2024 Pacific PNT Meeting, Honolulu, Hawaii, April 2024, pp. 293-304. https://doi.org/10.33012/2024.19610
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