System Concepts for Cycle Ambiguity Resolution and Verification for Aircraft Carrier Landings

Boris Pervan and Fang Cheng Chan

Abstract:	The Shipboard-Relative GPS (SRGPS) variant of the Joint Precision Approach and Landing System (JPALS) is being developed with the ultimate goal of providing navigation to support automatic shipboard landings in zero-visibility conditions. At present, the required vertical protection level for the navigation system is 1.1 m, with an associated integrity risk of approximately 10-7. Furthermore, it is desired that the integrity requirements be satisfied with a system availability of at least 99.85%. Because of the stringent nature of these requirements, differential carrier phase solutions are being pursued. In this context, this paper gives a detailed analysis of the fault-free (H0) integrity of SRGPS and introduces a number of relevant shipboard integrity monitoring concepts for fault detection. The sensitivity of SRGPS performance is quantified with respect to raw code and carrier measurement quality (standard deviations and time constants), spatial decorrelation of ionospheric and tropospheric errors, and broadcast service radius (which limits airborne filter duration). It is shown that while all of these elements do influence SRGPS performance, navigation system availability is most significantly affected by raw code (pseudorange) and carrier measurement error. The tradeoff between measurement error requirements and broadcast service radius is explicitly quantified.
Published in:	Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001) September 11 - 14, 2001 Salt Palace Convention Center Salt Lake City, UT
Pages:	1228 - 1237
Cite this article:	Pervan, Boris, Chan, Fang Cheng, "System Concepts for Cycle Ambiguity Resolution and Verification for Aircraft Carrier Landings," Proceedings of the 14th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 2001), Salt Lake City, UT, September 2001, pp. 1228-1237.
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