基于统计质量控制的测距故障检测方法

卫星导航接收机在城区环境使用时,多径信号的存在使得码自相关函数发生畸变,从而导致测距结果与真实距离间出现较大偏差。现有的接收机基带多径消除算法复杂度高,实现较为困难。而接收机自主正直性监测(RAIM)算法的故障检测能力有限,难以同时检测多个测距故障。提出使用统计质量控制方法来实现对测距故障的检测,根据质量控制图的输出结果调整测距信息在定位解算中的权重,从而提高定位精度。该方法能够对每颗卫星的码跟踪性能进行单独监测,算法实现的复杂度低。仿真结果表明:使用该方法能够有效指示多径信号导致的测距误差,从而为改善城区环境下的定位精度提供了新思路。

Ranging fault detection method based on statistical quality control

When satellite navigation receiver is used in urban area,existence of multipath signal cause distortion of code autocorrelation function,resulting in a large bias between ranging result and real distance.The baseband multipath cancellation algorithm of reciever is hard to implement due to its high computational complexity.While it is difficult for detecting ability of receiver autonomous integrity monitoring （RAIM） algorithm is limited to detect multiple failures.Propose a new method to detect ranging fault based on the idea of statistical quality control.According to output of quality control chart,adjust the weight of ranging information in positioning calculation,thus increase precision of positioning.The character of code tracking for each satellite is monitored separately,complexity of algorithm implementation is low.The simulation results demonstrate that the method can effectively indicate ranging error by multipath signal,which provides a new idea to improve location precision in urban environment.