On the Use of Differential GPS Corrections at the Ground Transmitters

Jacques Beser

Abstract:	GPS Ground Transmitters (GTs) are currently being developed to supplement the GPS satellites (SVs) coverage. If a user is operating in the differential mode, and uses a combination of svs and GTs, several issues related to the Reference Receiver (RR) clock error and the GT clock Synchronization are to be addressed as to their impact on position accuracy. Basically, when operating in the differential mode, a user is synchronized to "Range Time", due to the bias introduced by the RR clock error. But since no differential corrections are provided for the GTs, the question addressed by this paper is whether differential corrections should be used to synchronize the GT to Range Time, to better isolate position accuracy from the additional error introduced by the RR clock estimate. Error budgets are derived for several applications (ground,air,space) and accuracy as well as implementation issues are addressed. Preferred implementations are recommended for several hybrid (SVs and GTs) environments.
Published in:	Proceedings of the 2nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1989) September 27 - 29, 1989 The Broadmoor Hotel Colorado Spring, CO
Pages:	349 - 358
Cite this article:	Beser, Jacques, "On the Use of Differential GPS Corrections at the Ground Transmitters," Proceedings of the 2nd International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1989), Colorado Spring, CO, September 1989, pp. 349-358.
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