Because the traditional algorithms of satellite fault identification based on identifying threshold led to missed detection and false alarm, which reduced the correct identifying ratio, a new receiver autonomous integrity monitoring (RAIM) approach was proposed for identifying simultaneous double-faulty satellites. The geometry relationships between the proposed parity vector and faulty feature plane were used to identify the faulty satellites. Therefore the proposed algorithm was immune to the problem of identifying threshold and improved the correct identifying ratio. Computer simulation results indicate that compared with the existing traditional algorithms based on identifying threshold, the performance of faulty identification has a significant improvement, under the condition of simultaneous double-faulty satellites. With the proposed algorithm, the correct identifying ratio is as high as 90%. Moreover, compared with the reconstructed optimal parity vector algorithm based on identifying threshold, the new algorithm reduces more than 61.2% of the computational burden.
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