| 摘要: |
| 在GPS短基线相对定位中，可以根据多路径误差周期约为1天的重复性特点建立误差模型，采用坐标域或观测值域滤波的方法进行多路径误差改正。北斗系统由GEO、IGSO和MEO三种卫星类型组成，其中MEO卫星类型接近7天的轨道周期与GEO和IGSO约为1天的轨道周期差异较大，因此对北斗观测值进行多路径误差改正时只能采用观测值域滤波方法。本文以某水库大坝形变监测网为例，对GPS和BDS观测值分别建立多路径误差模型，根据各自卫星轨道周期进行多路径误差改正，结果表明经改正后大坝形变监测精度有较大提高。 |
| 关键词: GPS BDS 形变监测 多路径误差 |
| DOI： |
|
| 基金项目: |
|
| Study on the GNSS Deformation Monitoring of Dam Considering the Multipath Error Correction |
| YUAN Bing,XIONG Xun an,GONG Chun long,CHEN De zhong,YAN Yong wei |
| (Research Center of GNSS，Wuhan University;Shenzhen Municipal Planning and Design Institute) |
| Abstract: |
| According to that GPS multipath error cycle is about one sidereal day，correction model can be established to correct multipath error by coordinate domain filtering or observation domain filtering in GPS short baseline relative positioning.BDS is composed of three types of satellites，which are GEO，IGSO and MEO.Because MEO satellites have about seven sidereal days of orbital repeat period，which is very different from GEO and IGSO satellites’ approximate one sidereal day of orbital repeat period，multipath error correction of BDS observation can be corrected only through observation domain filtering.This paper gave an example of deformation monitoring network of one reservoir dam.According to those satellites’ different orbital repeat periods，multipath error correction models are established individually for GPS and BDS satellites to correct their multipath error.The results show that the precision of deformation monitoring of dam can be improved distinctively after multipath error was corrected. |
| Key words: |
