北斗系统GEO卫星伪距多路径误差改正  

Pseudo-range multipath error correction of BeiDou GEO satellites

作　　者：李卫锋[1] LI Weifeng(Nanjing Communications Institute of Technology,Nanjing,Jiangsu 211188,China)

机构地区：[1]南京交通职业技术学院,江苏南京211188

出　　处：《北京测绘》2024年第7期1053-1057,共5页Beijing Surveying and Mapping

基　　金：江苏省高等学校基础科学(自然科学)研究项目(23KJB430023)。

摘　　要：北斗系统地球静止轨道(GEO)卫星因相对于地面近似静止,其多路径误差相对于其他类型较为严重,且表现出系统波动现象。为提升定位精度,本文在GEO卫星伪距多路径误差特征研究的基础上,采用奇异谱分析方法对其进行修正,并通过伪距单点定位(SPP)验证伪距多路径误差修正效果。选取测站CUT0连续10d的静态观测数据进行修正试验。研究发现,GEO卫星伪距多路径误差序列表现出较强的天重复性,且多路径误差中的系统误差项越大,重复性也越强;在运用奇异谱分析方法修正GEO卫星伪距多路径误差各系统误差项后,多路径组合(MP)观测值和SPP的定位精度均有一定程度提升。BeiDou geostationary orbit(GEO)satellites are nearly stationary relative to the ground,and their multipath errors are more serious than other types,with systematic fluctuations.To improve positioning accuracy,this study analyzed the pseudo-range multipath error characteristics of GEO satellites and used the singular spectrum analysis method to correct the error.The effect of pseudo-range multipath error correction was verified by pseudo-range single point positioning(SPP),and static observation data from the CUT0 station over a period of 10 days were used for the correction experiment.The results find that the pseudo-range multipath error sequence of the GEO satellite exhibits strong daily repeatability,and a larger systematic error term in the multipath error indicates stronger repeatability.The correction of systematic error terms in the pseudo-range multipath errors of the GEO satellite using the singular spectrum analysis method improves the positioning accuracy to a certain extent for both multipath combination(MP)observations and SPP.

关 键 词：北斗系统 北斗系统地球静止轨道(GEO)卫星 伪距多路径误差 奇异谱分析 伪距单点定位(SPP) 定位精度 

分 类 号：P228.4[天文地球—大地测量学与测量工程]