一种新的接收机自主完好性监测算法研究

Research on a New Algorithm of Receiver Autonomous Integrity Monitoring

基于奇偶空间的"快照"RAIM算法利用冗余GPS卫星,可以一步检测系统的较大偏差故障,但对中等的累积型故障不具备检测能力。利用多元累积和检测冗余方程的奇偶残差向量,得到了一种新的RAIM算法——多元累积RAIM(Multivariate Cumulative RAIM,MC-RAIM),并将平均运行长度(Average Run Length,ARL)作为该算法性能判决的指标,根据Markov链的状态转移矩阵计算不同维数、窗口参数和报警门限下的ARL,通过仿真实验证明该算法对于GPS系统的中等累积型故障具有检测能力,弥补了原有RAIM算法的缺陷。

The algorithm of “snapshot” receiver autonomous integrity monitoring （ RAIM ） based on parity space can detect the deviation fault of system within one step,but can’t detect the cumulative fault by using redundant GPS satellite.The multivariate cumu-lative RAIM （ MC-RAIM） is deduced by using multivariate cumulative sum to check the parity residual error of GPS redundant equa-tion.The average run length （ARL）,used as the performance index of this algorithm,is computed by Markov state transfer matrix under the different condition of window coefficient and alarm threshold.The simulation experiment proves that this algorithm can detect medium cumulative fault and made use of redundant GPS to compute parity residual error,which could detect system fault within one step,but lost the capability for cumulative fault.the multivariate cumulative RAIM （MC-RAIM） Arithmetic was deduced,which using,and using average run length（ARL） as the performance index,which was computed by the.Finally,it was proved that this new Arithmetic could detect medium cumulative fault by the way of simulation and cover the shortage of “snapshot” RAIM.