BDS/GPS双星座卫星轨道RAIM检测算法优化

Optimization of RAIM Detection Algorithm for BDS/GPS Double Constellations Satellite Orbit

接收机自主完好性检测中,传统的故障检测方法通常只对单一故障卫星进行识别。但当接收机能接收多个导航星座信息时,多颗卫星同时发生故障概率增加,传统故障检测的方法计算子集快速增加,影响检测效率。针对上述问题,提出将卫星按轨道分组,构造故障检测子集的方法,降低检测子集数量,简化故障检测策略,并通过对双故障卫星进行边缘检测,验证算法的性能。仿真结果表明,卫星轨道方法能有效的检测与隔离双星故障情况,降低了计算复杂度,在伪距误差不小于70m时,对于双卫星故障的检测效率较高。

The traditional fault detection method is usually used to identify single satellite failure.However,when information of multiple navigation constellations is received,the probability of simultaneous failure of multiple satellites increases,which leads to rapidly increase of calculation subsets and reduction of the traditional fault detection efficiency.In this paper,a reasonable method of constructing fault detection subset via grouping satellites by orbit is brought out for this problem.The proposed method reduced the number of detection subsets and simplified the fault detection strategy.The performance of the algorithm was verified by detection of double fault satellites.Simulation results show that the proposed method can effectively detect and isolate the double fault satellites,therefore reduce the computational complexity.When the pseudorange error is not less than 70 meters,the efficiency of the proposed method for double fault satellites detection is higher.