A Position-Domain Method for Ensuring Integrity of Local Area Differential GPS (LDGPS)

Kelly Markin and Curtis Shively

Abstract:	This paper analyzes performance of a position-domain method for ensuring integrity of local differential GPS (LDGPS) for Category (CAT) I and CAT III precision approaches. In this method, the integrity check is performed in the aircraft by comparing position solutions based on sets of differential corrections from several independent reference receivers on the ground. By performing the integrity check directly in the position domain, this method avoids the conservatism of ground- based methods that compare corrections in the pseudomnge domain. Consequently, the position-domain method will likely have an availability advantage over the pseudorange- domain method. Performance of the position-domain method is analyzed and dilution of precision (DOP) restrictions derived to provide the desired alarm rate and probability of missed detection. Availability of the DOP needed to satisfy integrity and accuracy requirements for CAT I or CAT III applications is presented for GPS alone and GPS augmented by geostationary satellites or ground pseudolites.
Published in:	Proceedings of the 51st Annual Meeting of The Institute of Navigation (1995) June 5 - 7, 1995 Antlers Doubletree Hotel Colorado Springs, CO
Pages:	369 - 380
Cite this article:	Markin, Kelly, Shively, Curtis, "A Position-Domain Method for Ensuring Integrity of Local Area Differential GPS (LDGPS)," Proceedings of the 51st Annual Meeting of The Institute of Navigation (1995), Colorado Springs, CO, June 1995, pp. 369-380.
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