foursatvisitposition

说明：  matlab与stk的联合仿真的二次开发，这写的是四颗卫星访问地面站的例子，有兴趣可以来看一看，我们一起研究。(The second development of the joint simulation of MATLAB and stk, which is an example of four satellites visiting ground stations, is interesting to see, we will study together.)