Orbital Optimization of the GPS Constellation and Its Effect on Accuracy and Availability

Clifford W. Kelley and Steven C. Fisher

Abstract:	A study was performed in which predictions of a model optimizing satellite positions were compared to theoretical positions based on a set of simplifying assumptions. The validated model was used to perform an optimization of the GPS satellite Constellation for Vertical Dilution Of Precision (VDOP) and vertical accuracy availability using an analytical process based on simulated annealing. Resulting candidate constellations were characterized for availability, accuracy and capability to facilitate improved Receiver Autonomous Integrity Monitoring. Resulting constellations can be supported by enhanced IIF satellites, and offer improved vertical accuracy and availability approaching the CAT I precision approach requirements on a global basis.
Published in:	Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997) September 16 - 19, 1997 Kansas City, MO
Pages:	423 - 435
Cite this article:	Kelley, Clifford W., Fisher, Steven C., "Orbital Optimization of the GPS Constellation and Its Effect on Accuracy and Availability," Proceedings of the 10th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1997), Kansas City, MO, September 1997, pp. 423-435.
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