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�������պ����ѧѧ�� 2008, Vol. 34 Issue (7) :773-777    DOI:
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��ǿ, ������, ��Х��*
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RAIM algorithm for identifying simultaneous two-faulty satellites
Zhang Qiang, Zhang Xiaolin, Chang Xiaoming*
School of Electronics and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100191, China

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Abstract�� A new receiver autonomous integrity monitoring(RAIM) algorithm was proposed for identifying simultaneous two-faulty satellites. The optimal parity vector method was studied, and the results showed that the fault of one satellite may counteract the fault of the other satellite, which reduced correct identifying ratio greatly. Therefore a new approach was developed based the optimal parity vector method. For every possible two-faulty satellites combination, two new parity vectors were constructed for detecting and identifying simultaneous two-faulty satellites, using the parity vectors which were sensitive to designated satellite failure. Computer simulation results show that the correct identifying ratio of using new method is higher than that of using the optimal parity vector method, under the condition of simultaneous two-faulty satellites. With the new algorithm, the correct identifying ratio will be higher than 90%. Moreover, the new method simplifies the processing of constructing parity vector, and reduces more than 90% of the computational burden. So the new method is better for engineering implementation.
Keywords�� global positioning system   RAIM   algorithm   optimal parity vector   fault identification     
Received 2007-06-12;


About author: �� ǿ(1982-),��,ɽ��ɽ����,��ʿ��,zhangqiang@ee.buaa.edu.cn.
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Zhang Qiang, Zhang Xiaolin, Chang Xiaoming.RAIM algorithm for identifying simultaneous two-faulty satellites[J]  JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(7): 773-777
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