顾及坐标精度的地球自转参数联合解算方法研究  

Methodology for the combined computation of earth rotation parameters with consideration of coordinate accuracy

作　　者：史浩伟 俞克豪 李丽华[1,2] 李淑慧 杨红磊[1] 罗士淇[1] SHI Haowei;YU Kehao;LI Lihua;LI Shuhui;YANG Honglei;LUO Shiqi(School of Land Science and Technology,China University of Geosciences Beijing,Beijing 100083,China;Beijing Key Laboratory of Urban Spatial Information Engineering,Beijing 100045,China)

机构地区：[1]中国地质大学(北京)土地科学技术学院,北京100083 [2]城市空间信息工程北京市重点实验室,北京100045

出　　处：《测绘科学》2024年第3期1-7,共7页Science of Surveying and Mapping

基　　金：城市空间信息工程北京市重点实验室经费资助项目(20230111);国家自然科学基金项目(41574011,42174026);中国地质大学(北京)研究生创新资助项目(ZD2023YC055)。

摘　　要：针对空间目标导航定位必要参数之一的地球自转参数,在VLBI与BDS联合解算过程中的权重比存在差异的问题,利用同时期的VLBI和BDS数据,解算测站坐标和地球自转参数。结果表明,对于测站精度来说,利用VLBI连续加密观测数据得到的测站精度,均低于BDS的解算结果。但是,在观测条件相同的情况下,基于VLBI观测资料获取的地球自转参数精度要优于BDS的解算结果。基于自转参数的解算精度,确定联合解算时的权重因子,加权处理后的地球自转参数较单一BDS观测资料解算结果精度进一步提高,极移精度提升约20%,UT1-UTC精度提升约13%。In response to the issue of differences in the weight ratio of the earth rotation parameter,which is one of the necessary parameters for space target navigation&positioning,in the joint calculation process of VLBI and BDS,this article uses VLBI and BDS data from the same period to calculate the station coordinates and earth rotation parameters.The results indicate that for station accuracy,the station accuracy obtained by continuously encrypting observation data using VLBI is lower than the solution results of BDS.However,under the same observation conditions,the accuracy of the earth's rotation parameters obtained based on VLBI observation data is better than the calculation results of BDS.Based on the calculation accuracy of the rotation parameters,the weight factor for joint calculation is determined.The weighted processing of the earth's rotation parameters further improves the accuracy of the calculation results compared to a single BDS observation data,with an increase of about 2o%in polar displacement accuracy and about 13%in UT1-UTC accuracy.

关 键 词：VLBI连续加密观测 地球自转参数 北斗卫星导航系统 法方程 

分 类 号：P228.6[天文地球—大地测量学与测量工程]