地球定向参数预报误差及其对北斗三号卫星定轨精度的影响  

Inuence of Earth Orientation Parameter Forecast Error on the Orbit Determination Accuracy of Beidou-3 Satellite

作　　者：项宇 蒋孝卿 杨建华 胥灿灿 杨祚 吕昊 唐成盼[2,4] 王文斌 罗秋阳 许雪晴 XIANG Yu;JIANG Xiao-qing;YANG Jian-hua;XU Can-can;YANG Zuo;LYU Hao;TANG Cheng-pan;WANG Wen-bin;LUO Qiu-yang;XU Xue-qin(Beijing Satellite Navigation Center,Beijing 100094,China;Shanghai Astronomical Observato-ry,Chinese Academy of Sciences,Shanghai 200030,China;Key Laboratory of Planetary Sciences,Chinese Academy of Sciences,Shanghai 200030,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]北京卫星导航中心,北京100094 [2]中国科学院上海天文台,上海200030 [3]中国科学院行星科学重点实验室,上海100049 [4]中国科学院大学天文与空间科学学院,北京100049

出　　处：《天文学进展》2023年第2期269-278,共10页Progress In Astronomy

基　　金：上海天文台重点培育项目(N20210601003)。

摘　　要：地球定向参数(Earth orientation parameters,EOP)是地球参考系到地心天球参考系之间转换的桥梁,是卫星精密定轨过程中不可缺少的重要参数。以国际地球自转服务(International Earth Rotation Service,IERS)和中国科学院上海天文台(Shanghai Astronomical Observatory,SHAO)提供的EOP参数为例,分析了北斗三号仅区域网观测模式和星地星间联合观测模式下的定轨精度与EOP预报误差间的关系。研究表明,对于IERS提供的产品,其预报误差对仅区域站定轨模式的定轨精度影响较小,但是其10 d内的预报误差对星地星间联合定轨模式定轨精度的影响可达到分米级。对于SHAO提供的产品,两种定轨模式的定轨精度均随着EOP预报天数的增大而逐渐衰减。除此之外,不同产品的星地星间联合定轨模式下定轨精度均小于仅区域网监测下的定轨模式下的定轨精度,表明星间链路的加入可以降低卫星定轨对EOP预报误差的依赖。该研究对区域观测条件下的卫星精密定轨工程实现具有重要意义。The Earth orientation parameters(EOP)is the bridge between the Earth reference frame and the geocentric celestial reference frame,and it is an indispensable important parameter in the process of satellite precise orbit determination.Taking the EOP parameters provided by the International Earth Rotation Service and the Shanghai Astronomical Observatory as examples,this paper analyzes the relationship between the orbit determination residuals,orbit determination accuracy,and EOP prediction capability under the Beidou-3 regional network observation mode and the satellite-ground inter-satellite joint observation mode.The research shows that for the products provided by IERS,the prediction error has little effect on the orbit determination accuracy of the regional station-only orbit determination model,but its 10-day prediction error has an decimeter-level impact on the orbit determination accuracy of the satellite-Earth-satellite joint orbit determination model.For the products provided by the Shanghai Astronomical Observatory,the orbit determination accuracy of the two orbit determination modes gradually decreases with the increase of the EOP forecast days.In addition,the orbit determination accuracy of different products in the satellite-Earth inter-satellite joint orbit determination mode is smaller than that in the orbit determination mode only under regional network monitoring,indicating that the addition of inter-satellite links can reduce the EOP of satellite orbit determination.Dependence on forecast errors.This research is of great significance to the realization of satellite precise orbit determination engineering under regional observation conditions.

关 键 词：地球定向参数 卫星精密定轨 北斗三号 

分 类 号：P228[天文地球—大地测量学与测量工程]