天绘二号卫星相对定轨初步结果  

Preliminary results of the relative orbit determination of Tianhui-2 satellite

作　　者：秦显平[1,2] 钱方明 楼良盛[1,2] QIN Xianping;QIAN Fangming;LOU Liangsheng(Xi'an Research Institute of Surveying and Mapping,Xi'an 710054,China;State Key Laboratory of Geo-Information Engineering,Xi'an 710054,China)

机构地区：[1]西安测绘研究所,陕西西安710054 [2]地理信息工程国家重点实验室,陕西西安710054

出　　处：《测绘科学与工程》2021年第1期10-14,共5页Geomatics Science and Engineering

摘　　要：高精度星间基线测量是实现天绘二号卫星任务的前提,其星间基线信息通过星载GNSS相对定轨方式获得,除星载GNSS接收机外,天绘二号卫星之间没有高精度的测距系统,导致相对定轨精度无法采用外部数据检校。为合理评价天绘二号卫星相对定轨精度,一方面,采用KBR对GRACE卫星相对定轨进行外部检核,通过GRACE卫星相对定轨结果验证软件精度;另一方面,采用西安测绘研究所和国防科技大学两家结果互差进行直接评估。计算结果表明,CRACE卫星相对定轨得到的星间基线精度可达0.8mm,两家机构的天绘二号卫星相对定轨互差在R、T、N及3D方向的RMS分别为0.9mm、1.1mm.0.4mm和1.5mm,通过GRACE卫星的间接证明和两家机构结果的互差评估,可以初步得到天绘二号卫星相对定轨三维位置精度优于2mm的结论。The high-precision baseline measurement of Tianhui-2 satellite system is the prerequisite for the mission.The baseline information of Tianhui-2 satellite system is obtained through the relative orbit determination using the onboard GNSS re-ceiver.Since there is no high-precision ranging measurement system between the two satellites except the onboard GNSS receiv-er,it is impossible to use external data to evaluate the accuracy of the relative orbit determination.In order to reasonably evaluate the relative orbit determination accuracy of Tianhui-2 satellite system,K/Ka-Band Ranging(KBR)observations are used to evalu-ate the relative orbit determination of Gravity Recovery and Climate Experiment(GRACE)satellites and the result is used to veri-fy the accuracy of the software.In addition,the results of the relative orbit determination of Tianhui-2 satellite computed by Xian Research Institute of Surveying and Mapping and National University of Defense Technology are compared to provide the direct e-valuation.The results show that the precision of the baseline between two GRACE satellites is about 0.8 mm.The RMS differ-ences of the relative orbit determination of the two agency are about0.9 mm,1.1 mm,0.4 mm,and 1.5 mm in the radial,nor-mal,tangential and 3-dimensional directions respectively.Based on the above analysis,it can be concluded that the relative orbit determination precision of Tianhui-2 satellite is better than 2.0 mm in three dimensional positions.

关 键 词：分布式INSAR 卫星编队 天绘二号卫星 GRACE卫星 相对定轨 

分 类 号：P228[天文地球—大地测量学与测量工程]