GNSS接收机伪距偏差确定方法及其对定位的影响  

GNSS Receiver-Related Pseudorange Bias Determination Method and Its Effect on Positioning

作　　者：耿涛[1] 李钟兴 谢新 马壮 赵齐乐[1] GENG Tao;LI Zhongcing;XIE Xin;MA Zhuang;ZHAO Qile(GNSS Research Center,Wuhan University,Wuhan 430079,China)

机构地区：[1]武汉大学卫星导航定位技术研究中心,湖北武汉430079

出　　处：《武汉大学学报（信息科学版）》2023年第7期1134-1145,共12页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41974036);湖北省自然科学基金(2019CFA051);中央高校基本科研业务费专项资金(2042021kf0062);中国博士后科学基金(2020M682482)。

摘　　要：全球导航卫星系统(global navigation satellite system,GNSS)接收机伪距偏差是指卫星导航信号非理想特征导致的不同接收机的伪距测量常数偏差。研究表明,接收机伪距偏差无法被钟差参数吸收,将影响GNSS精密应用。选取了多GNSS实验全球跟踪网的9条零/短基线,将基线按照接收机类型分为3组,即相同厂商相同型号、不同厂商以及相同厂商不同型号,通过双差法确定了每组基线GPS/北斗卫星导航系统(Bei Dou satellite navigation system,BDS)/伽利略卫星导航系统(Galileo satellite navigation system,Galileo)的接收机伪距偏差,并分析了接收机伪距偏差的稳定性及其对整周模糊度解算和伪距相对定位的影响。结果表明,不同厂商接收机构成的基线,伪距偏差可达160cm,即使同一厂商不同型号的接收机间也存在不可忽略的伪距偏差;对于GPS、BDS和Galileo,Galileo伪距偏差最小,BDS伪距偏差最大。此外,接收机伪距偏差具有良好的稳定性,60d标准差不超过12cm。接收机伪距偏差改正后,GPS、BDS、Galileo双差宽巷Melbourne-Wubbena组合非整周部分均方根分别降低了17%、22%、14%,GPS、BDS、Galileo伪距相对定位三维误差分别从84.4、77.3、60.0cm降低到80.1、72.1、57.0cm。Objectives:Global navigation satellite system(GNSS)satellite chip shape distortions lead to individual biases in the pseudorange measurements.These biases are the results of the correlator's tracking response and thus depend on the correlator and front-end design of the receiver.As a result,different re-ceivers are likely to exhibit inconsistent biases,called receiver-related pseudorange biases.The researches show that the receiver-related pseudorange biases cannot be absorbed by clock offset,which will affect GNSS precision applications.Methods:We estimate the receiver-related pseudorange biases of global posi-tioning system(GPS)/BeiDou satllite navigation system(BDS)/Galileo satellite navigation system(Galileo)from 9 short/zero-baselines stations from the multi-GNSS experiment network using double dif-ference method.The baselines are divided into three groups according to the combinations of two receivers of one baseline.Results:The results indicate that the receiver-related pseudorange biases of receivers with different manufacturers even the same manufacturers with different models cannot be neglected.For baselines with receivers from different manufacturers,the inconsistences of pseudorange biases can reach up to 160 cm.Conclusions:Among GPS,Galileo and BDS,Galileo shows the smallest pseudorange biases,while BDS in general is the largest.Furthermore,the stability of pseudorange biases is analyzed,the results suggest that estimated receiver-related pseudorange biases are quite stable with the standard deviation less than 12 cm for the three systems.We investigate the effect of receiver-related pseudorange biases on integer ambiguity resolution and pseudorange relative positioning,with the pseudorange biases correction,the root mean squares of fractional parts of double difference Melbourne-Wubbena combination are decreased by 17%,22%,and 14%for GPS,BDS,Galileo,respectively.An improvement of pseudorange relative positioning accuracy is also confirmed,the 3D positioning errors of GPS,BDS,Galileo are reduced fro

关 键 词：接收机伪距偏差 零/短基线 模糊度解算 MW组合 伪距相对定位 

分 类 号：P228[天文地球—大地测量学与测量工程]