北斗二号卫星伪距偏差分析与建模  

Analysis and modeling of BDS-2 code bias

作　　者：段博文 白征东[1] 郭锦萍 DUAN Bowen;BAI Zhengdong;GUO Jinping(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《测绘工程》2024年第2期18-27,共10页Engineering of Surveying and Mapping

摘　　要：北斗二号系统伪距观测值中存在一种星源性的系统性偏差,也称为伪距偏差。文中基于全球10个IGS跟踪站的观测数据对伪距偏差进行分析,通过观察不同系统、不同卫星在不同时间、不同测站的MP组合,验证仅北斗二号系统存在伪距偏差,其中IGSO和MEO卫星的伪距偏差与高度角呈负相关,与观测时间和观测地点无关;GEO卫星的伪距偏差存在周期性规律,但不同站、不同时间差异较大。使用10个IGS站2020和2021两年的观测数据对伪距偏差进行建模,使用该模型修复伪距偏差后,发现伪距中与高度角相关的系统性误差被消除,PPP试验高程方向上平均精度提升31.7%,说明模型可以有效修复伪距偏差。There is a systematic bias related to satellites on the pseudorange observations of Beidou-2 navigation satellite system(BDS-2),also known as code bias.This thesis analyzes the code bias based on the observation data of 10 International GNSS Service(IGS)stations.By observing the multipath combinations of different systems and satellites at different times and different stations,it is found that only the BDS-2 observations has code bias.The code bias of Inclined Geosynchronous Orbit(IGSO)and Medium Earth Orbit(MEO)satellites is negatively related to the altitude angle,but not to the observation time and location;the code bias of Geosynchronous Earth Orbit(GEO)satellites is related to the observation time,but this relationship is not regular.Next,this thesis uses the observation data of 10 International GNSS Service(IGS)stations in 2020 and 2021 to model the code bias.After the correction,systematic bias related to altitude angle is eliminated,and the precise point positioning(PPP)accuracy is increased by 31.7%in the elevation direction,indicating that the code bias is effectively repaired by the model.

关 键 词：北斗二号 伪距偏差 误差建模 

分 类 号：P228[天文地球—大地测量学与测量工程]