The GPS 21 Primary Satellite Constellation

G. B. Green, P. D. Massatt, N. W. Rhodus

Abstract:	This paper defines the 21 Primary Satellite Constellation along with its maintenance strategy to be implemented in the mid 1990's. The 21 Primary Satellite Constellation will consist of 24 satellite positions (3 on orbit spares) to reduce significantly the constellation's sensitivity to satellite failures. Prior to its implementation, the Optimal 21 Satellite Constellation will be maintained. This constellation consists of 21 satellite positions which provide complete full coverage, but it is also more sensitive to satellite failure. Both constellations will incorporate a slight (0.2%) altitude change to be made in the Fall of 1989. This will remove the need for almost all on-orbit station-keeping maneuvers. This paper presents satellite locations for both constellations as well as positions for the first four Block II launches.
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:	15 - 26
Cite this article:	Green, G. B., Massatt, P. D., Rhodus, N. W., "The GPS 21 Primary Satellite Constellation," Proceedings of the International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1988), Colorado Spring, CO, September 1988, pp. 15-26.
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