The Results of More Than Three Years of GPS Absolute Position Solutions From one Site

Bruce R. Hermann, Everett R. Swift, M. Wendel Gouldman

Abstract:	In order to provide an independent evaluation of the Defense Mapping Agency’s (DMA) precise ephemeris and clock estimates, the Naval Surface Warfare Center (NAVSWC), Dahlgren, Va. has been periodically collecting dual frequency P-code pseudorange and phase data with a TI-4100 GPS receiver. Absolute positions at this site have been computed over a period of more than three years with both the broadcast ephemerides and clock estimates received from the satellites, and with the DMA precise ephemerides and clock estimates. From 445 days of independent estimates of position with the precise ephemeris, the standard deviations are 0.5 meters in the east and north components and 1.2 meters vertically. An apparent annual variation in the east component of the station’s position has been noted in the estimates obtained when the broadcast ephemerides are used. Several avenues of investigation are described which attempt to isolate the source of this signal.
Published in:	Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990) September 19 - 21, 1990 The Broadmoor Hotel Colorado Spring, CO
Pages:	655 - 660
Cite this article:	Hermann, Bruce R., Swift, Everett R., Gouldman, M. Wendel, "The Results of More Than Three Years of GPS Absolute Position Solutions From one Site," Proceedings of the 3rd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1990), Colorado Spring, CO, September 1990, pp. 655-660.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In