PPS and SPS Integrity Monitoring with an Independent Global Backing Network

Stephen Malys and Steven Holm

Abstract:	The Defense Mapping Agency (DMA) operates a global GPS tracking network in support of a post-fit (precise) GPS orbit determination process. This DMA network is entirely independent of the Air Force GPS monitor station network. The 15minute smoothed pseudorange data collected at the five well-known stations in the DMA network have been used to assess the fidelity of the broadcast navigation messages from each GPS satellite. Two months of tracking data were used to compute PPS and SPS range errors for all operational satellites. The residuals are analyzed on a satellite by satellite basis and on an overall system basis. Histograms are presented which characterize the magnitude and frequency of these empirical user range errors. System performance is evaluated from the perspective of PPS as well as SPS navigation users. Inferences are drawn which relate to the ‘GPS integrity’ issue.
Published in:	Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992) September 16 - 18, 1992 Albuquerque, NM
Pages:	979 - 984
Cite this article:	Malys, Stephen, Holm, Steven, "PPS and SPS Integrity Monitoring with an Independent Global Backing Network," Proceedings of the 5th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1992), Albuquerque, NM, September 1992, pp. 979-984.
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