一种顾及时空变化的BDS PPP多路径误差建模方法  

A BDS PPP Multipath Model Considering Spatio-TemporalVariation Characteristic

作　　者：罗浩 范永昭 叶世榕[1] 夏凤雨 李昭[1] 沙智敏 江俊飞 LUO Hao;FAN Yongzhao;YE Shirong;XIA Fengyu;LI Zhao;SHA Zhimin;JIANG Junfei(GNSS Research Center,Wuhan University,Wuhan 430079,China;Shanghai Astronomical Observatory,CAS,Shanghai 200030,China;Electric Power Science Research Institute of Guangdong Power Grid Co Ltd,Guangzhou 510620,China)

机构地区：[1]武汉大学卫星导航定位技术研究中心,武汉市430079 [2]中国科学院上海天文台,上海市200030 [3]广东电网有限责任公司电力科学研究院,广州市510620

出　　处：《大地测量与地球动力学》2024年第8期804-809,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金(41974031);中交公规院科技创新专项(C22030A);福建省高新技术与工业科技引导性资助项目(2022H0030)。

摘　　要：根据BDS GEO、IGSO、MEO三种星座卫星轨道运行特性,使用多路径误差半天球格网点模型(multi-point hemispherical grid model,MHGM)和恒星日滤波(sidereal filtering,SF)方法建立BDS混合星座的多路径误差改正模型。使用该模型改正多路径误差后,BDS精密单点定位(precise point positioning,PPP)的载波相位验后残差显著减小,E、N、U方向定位精度分别提升41%、37%、38%,收敛速度整体提升31%。Based on the satellite orbit characteristics of BDS GEO,IGSO,and MEO,we use multi-point hemispherical grid model(MHGM)and sidereal filtering(SF)method to establish a multipath error correction model for a mixed constellation of BDS.After applying the model to correct multipath errors,the post-fit carrier phase residuals for BDS precise point positioning(PPP)are significantly reduced,and the positioning accuracy in E,N,and U directions is improved by 41%,37%,and 38%,respectively,with an overall increase in convergence speed of 31%.

关 键 词：BDS 多路径误差 精密单点定位 多路径误差半天球格网模型 恒星日滤波 

分 类 号：P228[天文地球—大地测量学与测量工程]