接收机自主完好性监测算法及其性能分析

Analysis of Receiver Autonomous Integrity M onitoring Algorithm

完好性是卫星导航系统的重要性能参数,接收机自主完好性监测作为用户端的完好性监测方法具有低成本、实施方便的优势。基于统计理论,给出RAIM算法统计检测量的设计方法,推导了阈值的确定方法及RAIM可用性判定方法。对一天中2880个采样时刻的RAIM性能进行仿真分析,结果表明,RAIM算法对于固定伪距误差的故障和慢变故障有良好的监测效果,排除故障星之后的定位误差可以保持在正常的水平。

Integrity is an important performance parameter for satellite navigation systems, and as a user-level monitoring method, the receiver autonomous integrity monitoring has advantages of low cost and easy to be performed. Based on statistical theory, the design of statistics of RAIM algorithm is given and determination of threshold and method of availability analysis are deduced. The simulation analysis of 2 880 samples during a whole day demonstrates that RAIM performs well in the malfunction condition of fixed pseudorange error or slowly shiftin~ error, and the Dositionin~ error remain normal after the fault satellite are identified.