Impacts of GEOs as Ranging Sources on Precision Approach Category I Availability

Phuong Peggy Tran and James Dilellio

Abstract:	Geosynchronous satellites (GEOs) are required as transponders for correction signals in a Spaced Based Augmentation System (SBAS). However, GEOs can also be considered as additional ranging sources to improve positioning solution and integrity data. This paper examines the impact on Precision Approach Category I (PA CAT I) Availability when GEOs are used as additional ranging sources in a GPS augmentation system. Furthermore, this paper also examines the relief which GEOs could provide when the GPS constellation contains a failed space vehicle. The results from this study provide a useful foundation in the design of a SBAS.
Published in:	Proceedings of the IAIN World Congress and the 56th Annual Meeting of The Institute of Navigation (2000) June 26 - 28, 2000 The Catamaran Resort Hotel San Diego, CA
Pages:	14 - 22
Cite this article:	Tran, Phuong Peggy, Dilellio, James, "Impacts of GEOs as Ranging Sources on Precision Approach Category I Availability," Proceedings of the IAIN World Congress and the 56th Annual Meeting of The Institute of Navigation (2000), San Diego, CA, June 2000, pp. 14-22.
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