Analysis of a High Accuracy Service based on JPL’s Global Differential GPS

Nacer Naciri, Yoaz Bar-Sever, Willy Bertiger, Sunil Bisnath, Attila Komjathy, Mark Miller, Larry Romans, Bela Szilagyi, and Michele Vallisneri

Peer Reviewed

Abstract:	In the current global navigation satellite system (GNSS) context, with several constellations offering high accuracy services (HAS), we have evaluated a potential HAS for GPS based on JPL’s Global Differential GPS (GDGPS) system. This HAS also provides corrections for Galileo and GLONASS. In this paper, we specifically consider the scenario in which satellite corrections are delivered to users through the internet, similar to one style of access used for Galileo HAS. The GDGPS-based HAS described herein consists primarily of high-quality satellite orbit and clock corrections and currently excludes code and phase biases. Corrections are provided in two parallel variations: one stream supporting GPS and Galileo, and the other supporting GPS and GLONASS. Each variation is provided in two redundant instances for robustness, giving a total of four streams. Our results, including PPP solutions based on these products, attest to the quality of the corrections. PPP results show good performance, comparable to solutions generated based on real-time CNES products and better than solutions generated based on internet-based Galileo HAS products. For example, based on processing over 2,000 independent three-hour data sets, both the GDGPS-based HAS GPS+GAL streams and the CNES stream achieved post-convergence horizontal rms below 20 cm for 97% of data sets and below 10 cm for 80%. In contrast, only 86% of Galileo HAS-based solutions have post-convergence horizontal rms below 20 cm, and only 47% have rms below 10 cm. Overall, these results suggest a promising method of implementing a GDGPS-based HAS that might augment GPS, Galileo, and GLONASS.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 72, Number 1
Cite this article:	Citation Tools are available on the NAVIGATION open access site https://doi.org/10.33012/navi.686
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