USNO GPS/GLONASS PNT Products: Overview, and GPS+GLONASS vs GLONASS Only PPP Accuracy

C. Hackman, S.M. Byram, V.J. Slabinski, J.C. Tracey

Abstract:	The GPS Analysis Division, Earth Orientation Department, US Naval Observatory processes data from hundreds of carrier-phase GNSS receivers daily, computing 16 product sets/day using measurements from the GPS and/or (Russian) GLONASS satellite systems. Product sets include high-precision satellite orbits and clock corrections, receiver clock corrections, earth-orientation parameters (EOPs), a UT1-UTC extrapolator, and IGS Final Troposphere values for 300+ IGS receiver locations worldwide. The division has maintained a 98-100% on-time rate for all of its products since 2007. Both post-processed (3-16 hour latency) and predicted clocks/orbits/EOPs are produced. Post-processed GPS satellite orbits/clocks have approximately 17 mm/150 ps precision, with predicted GPS satellite orbits/clocks in the 40 mm/2 ns range. Post-processed/predicted GLONASS orbits have 5 and 12 cm precision, respectively. The clock/orbit predictions may be useful for real-time applications. This article consists of two parts. In the first, we summarize the precision and availability of GPS Analysis Division positioning/navigation/timing (PNT) and meteorology products. In the second, we present the results of a test in which we estimate PNT values using the precise-point positioning technique with GPS, GLONASS, and combined GPS and GLONASS measurements.
Published in:	Proceedings of IEEE/ION PLANS 2014 May 5 - 8, 2014 Hyatt Regency Hotel Monterey, CA
Pages:	793 - 803
Cite this article:	Hackman, C., Byram, S.M., Slabinski, V.J., Tracey, J.C., "USNO GPS/GLONASS PNT Products: Overview, and GPS+GLONASS vs GLONASS Only PPP Accuracy," Proceedings of IEEE/ION PLANS 2014, Monterey, CA, May 2014, pp. 793-803. https://doi.org/10.1109/PLANS.2014.6851444
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