Error Sources Affecting Differential or Ground Monitored Operation ofthe NAVSTAR Global Positioning System

Sanjaya Sharma

Abstract:	The current GPS constellation offers navigational accuracies of better than 40 meters. With intentional degradation the accuracy of the GPS system will be reduced to 100 meters (2 drms). Differential GPS will substantially eliminate intentional degradation effects, as well as other common errors, in local regions. However, another problem arises in using differential GPS; the magnitude of some of the common errors observed by the ground monitor station and user are not the same if the user and the ground station are separated from each other. The purpose of this paper is to study the effects of ionospheric and tropospheric propagation delays as the geometric distance between the user and the ground monitor station increases. A differential GPS computer simulation study was performed to find the effects on geometric decorrelation caused by the ionospheric and tropospheric propagation delays. This paper determines the best available ionospheric and tropospheric models and their potential to reduce further the 3-D position error of the GPS user.
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:	339 - 345
Cite this article:	Sharma, Sanjaya, "Error Sources Affecting Differential or Ground Monitored Operation ofthe NAVSTAR Global Positioning System," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 339-345.
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