GPS、Galileo、BDS、QZSS测距信号数据质量分析

基于多测站观测数据,采用伪距相位差组合和伪距多径组合方法,分析了GPS、Galileo、BDS和QZSS 4个系统伪距测量噪声和多径误差,比较了各系统内部信号数据质量以及系统间兼容信号数据质量。结果表明:GPS系统中L2C信号伪距测量精度要优于L2信号;Galileo系统中E5信号伪距测量精度最优,其E1和E5a信号伪距测量精度分别优于GPS/QZSS L1和L5信号;QZSS信号伪距测量精度与GPS信号基本一致;BDS系统三频信号伪距多径中均存在与高度角相关的系统性偏差,最大可达1m,且其三类卫星伪距测量精度有所差异,相同高度角条件下,GEO卫星伪距测量精度最优,IGSO卫星次之,MEO卫星最差。

Quality Analysis of the Range Measurement Signals of GPS、Galileo、BDS and QZSS Systems

Based on multi-station measurements of GPS,Galileo,BDS and QZSS systems,the code minus phase combination and multipath combination are adopted to quantify the code noise and multipath errors of the four systems mentioned.Then,data quality of the intra-system signals and overlap signals among different systems are analyzed respectively.The result shows that the accuracy of GPS L2C signal pseudo-range measurement is better than that of the L2 signal.In the Galileo system,E5 signal has the highest pseudo-range measurement accuracy,and the pseudo-range measurement precision of E1 and E5a signal is better than that of the GPS/QZSS L1 and L5 signal respectively.The pseudo-range measurement precision of QZSS signal is basically identical to that of the GPS signal.There is a systematic bias related to elevation angle in BDS triple frequency pseudo-range multipath which can be up to 1m.Differences among the pseudo-range measurement accuracy of triple types of BDS satellites also exist,with GEO satellite performing the best and MEO satellite the worst.