计算卫星位置用的，源代码，包括很多，比如sgp4模型-Used in calculating the satellite position, the source code, including many, such as model sgp4

Example of the fixed (AFSPC compatible) SGP4/SDP4 orbit propagator. (c) Paul Crawford & Andrew Brooks 1994-2010-The resulting diff.txt file should show virtually zero errors if the build worked OK, and the compve

SGP4官方程序,包括matlab，java，C++等源码和说明文件-Official program of SGP4 model,includes Matlab, VC, Java, etc.

software for fundamental of astrodynamic and application