ARP Fault Detection and Isolation: Method and Results
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1993-12-01
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Abstract:This study describes the development of a Receiver Autonomous Integrity Monitoring (RAIM) algorithm to meet the requirements for sole means navigation. The algorithm, referred to as a Fault Detection and Isolation (FDI) algorithm, is required not only to detect the presence of a faulty satellite in the navigation solution, but also to identify the faulty satellite and remove it from the solution. The project memorandum describes the development of the algorithm, algorithm testing, and compares its performance to that of a somewhat similar Fault Detection and Exclusion (FDE) algorithm. The FDE algorithm operates with a set of six satellites and does not attempt to explicitly identify the faulty satellite, but merely to exclude it from the solution. The results of an FDI availability study for CONUS are also given. These results are based upon GPS augmentation with measurements from a barometric altimeter. Augmentations of GPS with geostationary and GLONASS satellites are also evaluated. FDI availability is given for the en route, terminal, and nonprecision approach phases of flight.
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