Swarm系列卫星非差运动学厘米级精密定轨  

Centimeter precise orbit determination for the Swarm satellites via undifferenced kinematic method

作　　者：张兵兵 牛继强 王正涛[3] 徐丰[1,2] 田坤俊 ZHANG Bingbing;NIU Jiqiang;WANG Zhengtao;XU Feng;TIAN Kunjun(School of Geographic Sciences, Xinyang Normal University, Xinyang 464000,China;Key Laboratory for Synergistic Prevention of Water and Soil Environmental Pollution, Xinyang Normal University, Xinyang 464000,China;School of Geodesy and Geomatics, Wuhan University, Wuhan 430079, China)

机构地区：[1]信阳师范学院地理科学学院,河南信阳464000 [2]信阳师范学院河南省水土环境污染协同防治重点实验室,河南信阳464000 [3]武汉大学测绘学院,湖北武汉430079

出　　处：《测绘学报》2021年第1期27-36,共10页Acta Geodaetica et Cartographica Sinica

基　　金：国家自然科学基金(41671405,41771438,41774019);河南省研究生教育改革与质量提升工程(HNYJS2020JD14);信阳师范学院“南湖学者奖励计划”青年项目。

摘　　要：采用2015年5月24日—30日的Swarm星载GPS双频观测数据,基于Melbourne-Wübbena(MW)和消电离层线性组合,在精密单点定位技术的基础上,采用批处理最小二乘估计法对不同轨道高度的Swarm系列卫星进行非差运动学精密定轨。利用星载GPS相位观测值残差、与欧空局发布的简化动力学轨道对比,以及SLR检核3种方法对Swarm系列卫星非差运动学定轨结果进行精度评估。结果表明:①Swarm系列卫星星载GPS相位观测值残差RMS为6~7 mm;②与欧空局发布的简化动力学轨道进行求差,径向、切向及法向轨道差值RMS为2~4 cm;③与欧空局发布的运动学轨道进行求差,径向、切向及法向轨道差值RMS为1~2 cm;④SLR检核结果表明Swarm-A/B/C卫星轨道精度为3~4 cm。因此,采用非差运动学定轨方法与本文提供的定轨策略进行Swarm系列卫星精密定轨是切实可行的,定轨精度为厘米级。Using dual-frequency satellite-borne GPS observations from May 24 to May 30,2015,the linear combination of Melbourne-Wübbena and ionosphere-free linear combination,based on the basis of precise point positioning technology,the batch least squares estimation method is used to precisely determine the Swarm undifferenced kinematic orbits with different orbital attitudes.The orbit accuracy is assessed using three methods,which include satellite-borne GPS phase observation residuals analysis,comparison with ESA reduced-dynamic orbits and external evaluation with SLR measurements.The results indicate:①Swarm satellite-borne GPS phase observation residual RMS is in the range of 6~7 mm level.②Comparisons with reduced-dynamic orbits computed by European Space Agency(ESA),radial,along-track and cross-track orbit difference RMS are in the range of 2~4 cm level.③Comparisons with kinematic orbits computed by ESA,Radial,along-track and cross-track orbit difference RMS are in the range of 1~2 cm level.④The external validation with satellite laser ranging(SLR)measurement shows RMS errors are in the range of 3~4 cm level.Therefore,it is feasible to use the undifferenced kinematic orbit determination method and the orbit determination strategy provided in this paper to carry out the precise orbit determination of swarm series satellites.The orbit determination accuracy is centimeter level.

关 键 词：Swarm系列卫星 精密单点定位 非差运动学定轨 批处理最小二乘估计法 厘米级 

分 类 号：P228[天文地球—大地测量学与测量工程]