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Edition:Final report
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Abstract:Fault detection and isolation (FDI) algorithms are required to achieve a sole-means navigation system using GPS and Loran-C. In order to provide a better understanding of the Fault Detection and Isolation algorithm, a simplified example is presented using three voltmeters to measure a single voltage. The two redundant measurements allow for the full characterization of the FDI algorithm.
Because navigation systems will depend on FDI for integrity assurance, the availability of a navigation system will depend on the availability of at least two redundant measurements. A Markov analysis, combined with a GPS coverage program, is presented to show that GPS by itself could meet supplemental availability requirements for fault detection, but not for isolation. An example of an integrated navigation system, GPS/Loran-C, is presented and actual flight data is used to demonstrate the FDI algorithm in the presence of signal failures. Computer simulations are performed to inject artificial failures into GPS and Loran-C signals, and the results of the FDI algorithm are displayed pictorially.
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