测绘学报

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不同测站卫星质心不同改正对卫星激光测距定轨精度的影响分析

赵罡,王小亚,吴斌   

  1. 中国科学院上海天文台
  • 收稿日期:2011-03-18 修回日期:2011-09-07 出版日期:2012-04-25 发布日期:2012-04-25
  • 通讯作者: 赵罡

Effect Analysis of System-Dependent Center-of-Mass Correction on Precision of SLR Orbit Determination

  1. 1.
    2. Shanghai Astronomical Observatory , Chinese Academy of Sciences,
  • Received:2011-03-18 Revised:2011-09-07 Online:2012-04-25 Published:2012-04-25

摘要: 质心改正是利用卫星激光测距资料进行精密定轨过程中必须修正的一项系统偏差,数值模拟和理论分析均已显示,由于卫星形状效应,质心改正存在对测站系统运行模式的依赖性,即不同测站对卫星质心的改正是不同的。本文首次分析了这种依赖性对卫星定轨精度的影响。长时间序列的统计结果表明,与全球统一测站卫星质心改正相比,采用不同测站卫星质心不同改正系统性地提高了短弧定轨精度。对Lageos-1/2,平均提高约0.4毫米;对Etalon-1/2,平均提高约0.6毫米。在各种相关应用对卫星激光测距数据处理精度要求迈向毫米级的今天,有必要考虑不同测站卫星质心不同改正。

Abstract: Center-of-Mass (CoM) correction is a kind of systematic bias which must be corrected in precise orbit determination (POD) using satellite laser ranging (SLR) data. Numerical simulation and theoretical analysis have demonstrated the dependence of CoM corrections on system operating modes of SLR stations due to satellite signature effect, i.e. different CoM corrections should be applied on SLR data from different stations. For the first time, we analyze the influence on POD exerted by such dependence. Statistics over long-time series showed after adopting system-dependent CoM correction, the short-arc orbit determination precision has indeed undergone general improvement comparing to the situation of traditional global uniform CoM correction. The mean precision improvement is approximately 0.4 mm for Lageos-1/2 and 0.6 mm for Etalon-1/2. As the current requirements on SLR data processing for relevant applications have achieved sub-centimeter even towards millimeter level, it is necessary to take in the effect of system-dependent CoM correction.