北斗导航定位系统（BDS）下地壳运动监测精度分析

为分析北斗导航定位系统（BDS）在地壳运动监测领域的数据精度，选取中国大陆构造环境监测网络（陆态网络）2018—2019年川滇地区GPS、BDS多系统观测站点数据，分别对GPS、BDS记录的数据进行解算，从三维坐标解、位置时间序列及速度场等方面，对比分析二者在地壳运动监测中的不同，综合分析BDS对地壳运动监测精度。结果表明，BDS定位精度达到cm级，但仍低于GPS精度，BDS、GPS速度场模型运动方位和速度值有所不同，垂向差异较为明显。总体来看，北斗系统数据满足高精度定位解算要求，可用于监测形变量较大的区域地壳运动。

Research on the accuracy of Beidou Navigation Satellite System (BDS) in crustal motion monitoring

In order to analyze the accuracy of BDS in the field of crustal motion monitoring,In this paper,the data of GPS and BDS multi-system observation station of CMONOC in Sichuan and Yunnan region from 2018 to 2019 are selected and calculated respectively,the differences of BDS and GPS in monitoring the crustal motion from 3D coordinate solution,position time series and velocity field model are compared,the accuracy of BDS in monitoring crustal motion is comprehensively analyzed.The results show that although the positioning accuracy of BDS reaches centimeter level,it is still lower than that of GPS.The motion azimuth and velocity values of BDS and GPS velocity field model are different,and the vertical difference is obvious.Overall,the BDS satisfies the requirements of high-precision positioning solution and can be used to monitor regional crustal motion of the large deformation area.