摘要
给出了GPS系统现有导航电文与现代化后导航电文的参数拟合算法,比较分析采用两种不同广播星历参数进行轨道拟合与外推的精度。结果表明,在相同拟合时长下,18参数算法拟合精度高出16参数近一个数量级,外推2小时卫星轨道计算时,18参数算法优于16参数。参照目前的GPS广播星历更新策略,采用16参数4小时轨道拟合,误差损失约为14cm,采用18参数3小时轨道拟合,误差损失约为1cm。
A parameter fitting algorithm was studied for the current broadcast ephemeris and the modernizing broadcast ephemeris which were used to analyze the orbit fitting accuracy and orbit extrapolating accuracy respec- tively. It was shown that the 18-parameter algorithm is an order of magnitude higher than the 16-parameter algo- rithm for the orbit fitting accuracy in the same fitting interval, and the 18-parameter algorithm is better than the 16- parameter algorithm for the 2-hour orbit extrapolation. According to the current GPS broadcast ephemeris update strategy, the 4-hour orbit fitting by the 16-parameter algorithm could have the accuracy by 14cm, while the 3-hour orbit fitting by the 18-parameter algorithm could have the accuracy by lcm.
出处
《大地测量与地球动力学》
CSCD
北大核心
2013年第1期53-58,共6页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(40904007)
国家863项目(2012AA12A202)
关键词
GPS广播星历
GPS现代化
参数拟合
轨道外推
精度分析
GPS broadcast ephemeris
GPS modernization
parameter fitting
orbit extrapolation
precision analysis