Specifications and Management of a 30 Satellite Constellation

Clifford W. Kelley

Abstract:	A set of specifications for satellite orbital positions were derived to maintain availability of CAT I for all users between 75° north and 75° south latitudes. These specifications were derived to maintain an overall availability of 0.999 for VDOP of less than 3.9. Methods of constellation management including scheduling maintenance down time and re-phasing were examined to improve the availability of VDOP for 1 and 2 satellites out. By combining planning and occasional re-phasing the un-availability can be reduced by about 50%.
Published in:	Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998) September 15 - 18, 1998 Nashville, TN
Pages:	1111 - 1118
Cite this article:	Kelley, Clifford W., "Specifications and Management of a 30 Satellite Constellation," Proceedings of the 11th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1998), Nashville, TN, September 1998, pp. 1111-1118.
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