基本导航模式下BDS-3卫星地影期间的定轨精度分析  

Orbit Accuracy for BDS-3 Satellites During the Earth Eclipsing Period in Basic Navigation Mode

作　　者：李晓杰 刘晓萍 祖安然 徐君毅 刘帅 辛洁 郭靖蕾 LI Xiaojie;LIU Xiaoping;ZU Anran;XU Junyi;LIU Shuai;XIN Jie;GUO Jinglei(32021 Troops,Beijing 100094,China;Shanghai Key Laboratory for Space Positioning and Navigation,Shanghai 200030,China;Beijing Satellite Navigation Center,Beijing 100094,China)

机构地区：[1]32021部队,北京100094 [2]上海市定位与导航重点实验室,上海200030 [3]北京卫星导航中心,北京100094

出　　处：《武汉大学学报（信息科学版）》2020年第6期854-861,共8页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金(41704037,41874043,41804030,61603397)。

摘　　要：2015年以来陆续发射入轨的北斗全球卫星导航系统(简称北斗三号系统,BeiDou global navigation satellite system,BDS-3)卫星,其姿态控制增加了连续动态偏置模式,为研究BDS-3卫星在地影期间的定轨精度提供了条件。首先利用ECOM(empirical CODE(Center for Orbit Determination in Europe)orbit model)系列模型评估了BDS-3卫星的光压摄动建模精度和定轨精度,同时以轨道重叠弧段精度、用户等效距离误差(user equivalent range error,UERE)、卫星激光测距(satellite laser ranging,SLR)残差和定位精度为指标,对基本导航模式下BDS-3卫星的定轨精度进行了评估。然后基于北斗60余天的实测数据进行了实验,结果表明,BDS-3卫星克服了区域系统卫星在姿态控制模式转换期间定轨精度下降的问题,其定轨精度与动态偏置期间定轨和预报精度相当,仅下降2~3 cm,定位精度下降1 cm,这与目前北斗的定轨精度和定位精度相比,可以忽略。进一步的分析表明,采用ECOM 5参数光压模型,连续动偏期间的轨道重叠弧段精度为0.26 m,预报2 h的UERE均方根降低至1.22 m,SLR残差的均方根小于0.31 m,大大提升了北斗系统的可用性。Satellites of BeiDou global navigation satellite system(BDS-3)have been launched into orbit since 2015,and continuous yaw-steering(CYS)mode is available for these satellites.Therefore,the orbit determination accuracy of BDS-3 satellites during earth eclipsing period is worth studying.Firstly,ECOM models are used to evaluate the accuracy of the light pressure perturbation modeling and orbit determination of BDS-3 satellites.At the same time,the accuracy of the orbit determination for BDS-3 satellites in the basic navigation mode is evaluated using the overlapping arc segment error,user equivalent range errors(UERE),satellite laser ranging(SLR)residuals,and positioning accuracy as indicators.Then,experiments based on more than 60 days measured data of Beidou are conducted,and the results show that the orbit accuracy of the radial component in CYS mode for the BDS-3 satellites in basic navigation mode degrades by 2 to 3 cm,positioning accuracy degrades only by 1 cm over that in yaw-steering mode,which is just a small reduction in accuracy compared with the decimetre-level BDS orbit accuracy and the metre-level single point positioning accuracy with BDS pseudo-range data.This overcomes declining orbit and positioning accuracy issues in ON mode for BDS-2 satellites.Other results also show that the reliability of BDS has been improved.The overlapping URE is 0.26 m,root mean square(RMS)of UERE for 2-hour orbital prediction is 1.22 m,RMS of SLR residuals is better than 0.31 m.

关 键 词：基本导航模式 北斗全球卫星导航系统 地影期 定轨精度 

分 类 号：P228[天文地球—大地测量学与测量工程]