Influence of Satellite Geometry, Range, Clock, and Altimeter Errors on Two-Satellite GPS Navigation

Philip D. Bridges

Abstract:	Flight tests were conducted at Yuma Proving Grounds, Yuma, AZ, to determine the performance of a navigation system capable of using only two GPS satellites. The effect of satellite geometry, range error, and altimeter error on the horizontal position solution were analyzed for time and altitude aided GPS navigation (two satellites + altimeter + clock). The east and north position errors were expressed as a function of satellite range error, altimeter error, and east and north Dilution of Precision. The equations for the Dilution of Precision were derived as a function of satellite azimuth and elevation angles for the two satellite case. The expressions for the position error were then used to analyze the flight test data. The results showed the correlation between satellite geometry and position error, the increase in range error due to clock drift, and the impact of range and altimeter error on the east and north position error.
Published in:	Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988) September 19 - 23, 1988 The Broadmoor Hotel Colorado Spring, CO
Pages:	253 - 257
Cite this article:	Bridges, Philip D., "Influence of Satellite Geometry, Range, Clock, and Altimeter Errors on Two-Satellite GPS Navigation," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 253-257.
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