Abstract
Its an effective means to ensure maximum availability of satellite navigation systems by rapid fault detecting, recovering and satellite rejoining. In this paper, methods of in-orbit satellite failures rapid detection, fast clock error determination and orbit determination after fault recovery were studied. Then, rapid satellite fault recovery mechanism and processes were established, so as to ensure the constellation reforming capability with enough satellites in a short time, while service capability of navigation users was recovered. The test results indicate that satellite fault detecting time decreases to a level of 5 min compared with a level of 30 min before. Moreover, satellites clock parameters were quickly calculated and injection messages were generated as soon as possible. All methods above effectively decreased the satellite unavailable time, and reduced the waste of satellites resources and life caused by satellite failures.
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