Airborne Autonomous Fault Detection for Shipboard Landing Navigation using Carrier Phase DGPS

M-B. Heo, B. Pervan

Abstract:	Shipboard-Relative GPS (SRGPS) is an architectural variant of the Joint Precision Approach and Landing System (JPALS) that is being developed to provide DGPS navigation for automatic shipboard landings in zero-visibility conditions. Unlike similar operations at ground-based airports, shipboard landing calls for higher navigation performance because of the mobility of the landing platform. The required vertical protection level for the navigation system is 1.1 m, with an associated integrity risk of approximately 10-7. Under nominal signal conditions, it is desired that these integrity requirements be satisfied with a system availability of at least 99.7%. Because of the stringent nature of these specifications, carrier phase DGPS (CDGPS) solutions are being pursued. This research is focused on the design of airborne integrity monitor algorithms to detect and isolate navigation threats that are undetectable by integrity monitors at the shipboard differential reference station. Such threats can be separated into two fundamental categories: (1) aircraft receiver failures, and (2) signal-inspace anomalies whose effects depend on the displacement between the user and the ship. For the carrier-phase-based SRGPS architecture, tracking loop cycle slips are the most obvious threats of the first category. Relevant threats that fall into the second class include ionospheric gradient and satellite orbit ephemeris anomalies. Airborne autonomous integrity monitoring algorithms designed to detect each of these threats are addressed in detail in this paper. The performance of the proposed integrity monitors is directly evaluated relative to the integrity requirements for aircraft shipboard landing navigation applications.
Published in:	Proceedings of the 2003 National Technical Meeting of The Institute of Navigation January 22 - 24, 2003 Disneyland Paradise Pier Hotel Anaheim, CA
Pages:	441 - 453
Cite this article:	Heo, M-B., Pervan, B., "Airborne Autonomous Fault Detection for Shipboard Landing Navigation using Carrier Phase DGPS," Proceedings of the 2003 National Technical Meeting of The Institute of Navigation, Anaheim, CA, January 2003, pp. 441-453.
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