GPS测时的接收机自主完好性监测算法

The Algorithm of GPS Timing Receiver Autonomous Integrity Monitoring

描述了测时接收机自主完好性监测(T-RAIM)算法,给定漏检率和误警率,解算出了不同可视卫星数对应的故障检测门限值和非中心化参数,模拟卫星钟出现ramp误差和step误差两种故障情况,分析了异常卫星钟差对故障检测的检验统计量、接收机钟差及其标准差造成的影响。结果表明,T-RAIM算法能很好地解决GPS测时的完好性问题,在一定程度上保证了测时精度的稳定。

In this paper, the algorithm of timing receiver autonomous integrity monitoring （T-RAIM） is introduced. Provided the missed detection and false alarm probabilities, the threshold of failure detection and noncentrality parameter corresponding with different number of the visible satellites are calculated. Then two situations, the ramp and step error of the satellite clock, are simulated. The effects of abnormal satellite clock errors on the statistics of failure detection, receiver clock offset and its standard deviation, are analyzed. The result shows that the algorithm can solve the integrity of GPS timing well and ensure the stability of the timing＇ s accuracy to a certain extent.