基于星历拟合的GPS广播星历参数评估分析

Evaluation Analysis on GPS Broadcast Ephemeris Parameters Based on the Ephemeris Fitting

为了更好地利用广播星历参数进行导航电文参数的优化设计,在拟合GPS广播星历参数的基础上,通过减少其中不同的调和项系数,分别对预报星历进行拟合计算分析,以对不同的GPS广播星历参数进行质量评估.结果表明,去掉GPS广播星历15参数中的Cis,Cic2个参数后用余下的13参数仍能满足普通用户的导航定位较高精度的要求.

Optimization design on navigation message based on broadcast ephemeris parameters were studied.In accordance with the fitting GPS broadcast ephemeris parameters,prediction ephemeris was used to make fitting calculation and analysis,in order to evaluate different GPS broadcast ephemeris parameters by using reducing its different ephemeris parameters.The results show that the remaining 13 parameters can meet common customers navigation and positioning requirements of high precision after removing two parameters about Cis,Cic in the GPS broadcast ephemeris.