IGS分析中心轨道综合算法实现及精度分析  

Orbit Combination Algorithm and Accuracy Analysis of IGS Analysis Center

作　　者：耿涛[1,2] 徐夏炎 

机构地区：[1]武汉大学GNSS中心,武汉市珞喻路129号430079 [2]地球空间信息技术协同创新中心,武汉市珞喻路129号430079

出　　处：《大地测量与地球动力学》2017年第4期369-373,384,共6页Journal of Geodesy and Geodynamics

基　　金：国家自然科学基金青年基金(41404032)~~

摘　　要：针对IGS轨道综合原理,利用自编算法对IGS各分析中心2014-07~2015-07精密轨道进行综合,获得GPS综合轨道,为我国北斗系统中GEO/IGSO/MEO的轨道组合方法提供参考。结果表明,使用分析中心SIO和不使用SIO综合获得的轨道精度最大三维RMS差异可达4mm,GPS 1 807周后加入分析中心SIO综合,综合轨道整体精度提高近50%;使用不同的坐标框架统一方法进行轨道综合,精度差异明显,利用单天SINEX旋转参数统一坐标参考框架优于利用ERP参数旋转统一坐标参考框架的方法;最后,使用本文算法计算得到的1a轨道结果与IGS综合轨道作比较,两者三维差异小于3mm,RMS均值为1.50mm,根据各卫星精度因子计算的加权RMS均值为1.16mm,证明了本文算法的精度和稳定性。In this paper, based on research from July 2014 to July 2015 from the International GNSSservice （IGS） orbit combination theory, GPS combined orbit is computed by an independent algo-rithm, using the precise orbit of IGS analysis centers. This method has advantages over the combina-tion method of GEO/IGSO/MEO orbit of the Beidou navigation system. According to the experiment,the maximum three-dimensional root mean square（RMS） accuracy difference of combined orbit is up to4 mm, using the analysis of the Scripps Institution of Oceanography （SIO）. The precision of the com-bined orbit increases nearly fifty percent by using SIO since GPS week 1 807. When using the differentmethods to eliminate the difference of coordinate reference frame, the accuracy of combined orbit dra-matically changed, and the result using the rotation parameter of SINEX is better than that of usingthat of ERP. Finally, the combined orbit is calculated from 2014 July to 2015 July. Compared withIGS combined orbit, it is found that the three-dimensional difference is less than 3 mm, the meanRMS is 1.50 mm and the weighted mean RMS is 1.16 mm, according to the satellite accuracy code,proving the algorithm＇s accuracy and stability.

关 键 词：GPS 轨道综合 参考框架差异 精度分析 

分 类 号：P228[天文地球—大地测量学与测量工程]