GRACE-FO卫星简化动力学精密定轨研究  

Reduced-dynamic precise orbit determination research for GRACE-FO satellites

作　　者：杨洲铭 郭金运[1] 夏要伟 刘新[1] 周茂盛[1] 纪兵[2] YANG Zhou-ming;GUO Jin-yun;XIA Yao-wei;LIU Xin;ZHOU Mao-sheng;JI Bing(College of Geomatics,Shandong University of Science and Technology,Qingdao 266590,China;Department of Navigation Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]山东科技大学测绘科学与工程学院,青岛266590 [2]海军工程大学导航工程系,武汉430033

出　　处：《地球物理学进展》2020年第5期1710-1716,共7页Progress in Geophysics

基　　金：国家自然科学基金(41774001,41374009,41774021);国家科技基础性工作专项(2015FY310200)资助.

摘　　要：GRACE-FO(Gravity Recovery and Climate Experiment Follow-On)是美国和德国联合发射的两颗编队重力卫星,用于接替GRACE卫星继续对地球重力场进行观测.本文基于简化动力学方法,使用星载GPS观测数据,对GRACE-FO卫星进行精密定轨研究,通过载波相位残差分析、重叠轨道比较、与参考轨道对比、卫星激光测距检核和星间测距检核五种手段来评估轨道精度.结果表明:两颗GRACE-FO卫星载波相位残差均在6.7~7.2 mm之间,重叠轨道各方向RMS(Root Mean Square)精度在1 cm左右.与德国地学中心GFZ发布的参考轨道对比后发现,GRACE-FO卫星3D-RMS优于2 cm,其中径向和法向轨道残差RMS值均在1 cm左右,两颗卫星对应方向(如径向-径向)残差序列相关系数分别为0.80、0.65和0.79,证明两颗卫星轨道误差分布相关性较高.SLR(Satellite laser ranging)检核和KBR(K-band ranging)检核结果表明,解算的简化动力学轨道精度整体优于2.4 cm,与参考轨道精度无明显差异,GRACE-FO卫星简化动力学精密轨道反算得到的星间距精度达到1 cm.Designed as a successor to GRACE,the twin GRACE Follow-On(GRACE-FO)satellites were jointly developed by National Aeronautics and Space Administration(NASA)and German Research Centre for Geosciences(GFZ).The main mission of GRACE-FO is to continue to provide high-resolution monthly solution products of the Earth’s gravity field.The space-borne GPS data are used to determine precise orbit of GRACE-FO satellites with the reduced-dynamic method,and then the orbital accuracy is assessed with the carrier phase residual analysis,overlapping orbit comparison,comparison with reference orbit,SLR and KBR checks.The results show that the variation range of phase residuals for GRACE-FO is 6.7~7.2 mm.The Root Mean Square(RMS)error of the overlapping orbits is about 1 cm.Comparing with the reference orbit released by GFZ,it is found that the 3 D-RMS of the GRACE-FO satellites is better than 2 cm,and the RMS errors of the radial and normal orbit residuals are all about 1 cm.The correlation coefficients,two satellites corresponding direction(such as the radial direction),of the residual sequence are 0.80,0.65 and 0.79,indicating the orbit errors of GRACE-FO are similar.The SLR and KBR checking results show that the reduced-dynamic orbital accuracy is better than 2.4 cm,and the distance accuracy of GRACE-FO calculated by reduced-dynamic precise orbit reaches 1 cm.

关 键 词：GRACE-FO 简化动力学法定轨 星载GPS SLR检核 KBR检核 

分 类 号：P228[天文地球—大地测量学与测量工程]