由david vallado更新的轨道确定的程序代码，本程序融合sgp4和sdp4，包含193个文档-this procedure is the sgp4 prediction model from space command. this is an updated and combined version of sgp4 and sdp4

SGP4航天器轨道预报模型的MATLAB程序，可直接使用并对其进行二次开发。-Matlab program of SGP4 model for orbit prediction of spacecrafts.

基于最小二乘算法的SGP4轨道预报精度分析程序。-Precision analysis of SGP4 model based on Least Squares method.