摘要
为了确定CHAMP卫星的轨道,由星载GPS数据和IGS跟踪站的GPS数据构造星地相位双差观测量,利用EOP、SGO、时间等数据,对GPS数据进行预处理,包括钟差改正、模糊度解算和周跳探测、卫星姿态改正、天线偏差和相位中心改正等,采用CHAMP卫星受力摄动模型,根据动力学原理,对CHAMP卫星进行实际定轨。与德国GFZ定轨结果PSO相比,本方法定轨结果径向精度为0.285 7 m。对于1 d的重叠轨道,径向轨道差异的RMS为0.095 8 m。对于轨道端点比较,径向轨道差异平均为0.066 6 m。
In order to determine the CHAMP's orbit, the onboard GPS data of CHAMP, the GPS data of IGS tracking stations, EOP, SGO and time data are necessary. The GPS data should be pre-processed to correct the clock error, solve the ambiguity, detect the cycle slips, determine the satellite attitude, and calculate the antenna phase center offset and correction. Then the air-ground GPS double-difference phase observations are constructed. The CHAMP's orbit is really determined with the dynamic method. Comparing with the PSO from German GFZ, the precision (RMS) in the radial direction is 0. 285 7 m. For the 1-day overlapping orbit, the RMS of radial orbit difference is 0. 095 8 m. Comparing the orbit endpoints, the mean difference of radial orbit is 0. 066 6 m.
出处
《武汉大学学报(信息科学版)》
EI
CSCD
北大核心
2006年第3期213-217,共5页
Geomatics and Information Science of Wuhan University
基金
地球空间环境与大地测量教育部重点实验室开放研究基金资助项目(02-09-13)
山东省重点实验室开放研究基金资助项目(SD2003-4)
FIGFoundation资助项目
山东省自然科学基金资助项目(Y2003E01)
江苏省高校自然科学基金资助项目(05KJB170129)