THE USE OF SATELLITE GEOMETRY FOR PREVENTION OF CYCLE SLIPS IN A GPS PROCESSOR

James W. Sennott and David Senffner

Peer Reviewed

Abstract:	For kinematic survey and precise control of aviation, marine, and land vehicles, reliable GPS carrier phase tracking is critically important. In commercial GPS receivers, carrier phase tracking functions for individual satellites are carried out in a decoupled fashion, ignoring intersatellite path correlations seen at the receiver antenna. In contrast with traditional GPS signal processors, the performance of the new coupled tracker is geometry-dependent. Simulations for the complete tracking loop system illustrate how the coupled structure takes advantage of path correlations to greatly reduce phase tracking errors during periods of signal attenuation and blockage. The coupled processor is compared with a traditional processor during simulated aircraft turning maneuvers. Cycle tracking continuity is explored for overdetermined and minimal geometry scenarios. Differential correction options and computational load are also addressed.
Published in:	NAVIGATION: Journal of the Institute of Navigation, Volume 39, Number 2
Pages:	217 - 236
Cite this article:	Sennott, James W., Senffner, David, "THE USE OF SATELLITE GEOMETRY FOR PREVENTION OF CYCLE SLIPS IN A GPS PROCESSOR", NAVIGATION: Journal of The Institute of Navigation, Vol. 39, No. 2, Summer 1992, pp. 217-236.
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