LAGEOS卫星精密定轨及残差分析

Determination of LAGEOS Satellite's Precise Orbits and Residual Analysis

介绍LAGEOS卫星用卫星激光测距(SLR)资料精密定轨和在精密定轨基础上的残差分析处理。SLR资料的分析处理方法、采用的力学模型和解参数的多少根据目标的不同而不同。对不同的方案进行了详细分析、比较。其关键是对LAGEOS卫星进行精密定轨。得出了目前上海天文台在SLR资料的分析处理中已采用的解算模式。作为例证,该解算模式分析处理了1998年12月31日至1999年6月29日LAGEOS卫星的SLR资料,得到每3天一个弧段的精密轨道。结果显示每3天一个弧段的定轨残差rms都小于2厘米。上海天文台从1999年10月1日开始了全球LAGEOS-1和LAGEOS-2资料的快速分析服务,结果可从APSG的网址:http://center.shao.ac.cn/APSG/result获得。

Determination of LAGEOS satellite's precise orbits baseed on analysing residual error of SLR data are introduced in detail. The method analyzing the data of satellite laser ranging (SLR), the dynamical models used and the number of parameters estimated should be changed with the different purposes. The schemes were compared with each other and were analyzed with the number of parameters estimated and the residual errors in detail. The determination of precise orbits is the key of these. To acquire a precise orbit, the models determining the EOP were modified. The scheme being used by SHAO was selected from the several schemes. In this paper, the results of LAGEOS satellite's precise orbits from Dec. 31, 1998 to Jun. 29, 2001 are set out only. The results show that the root-mean square value of the residuals are less than 2cm. SHAO has begun the service of LAGEOS-1 & LAGEOS-2 quick-look residual analysis since Oct.1,1999. The results can be find on the intent address: http://center.shao.ac.cn/APSG/result