可读取星历文件和观测文件，并实现伪距单点定位，并输出结算结果的TXT文件(Can read ephemeris files and observation files, and realize pseudo distance single point positioning, and output the results of the settlement of the TXT file)

利用GPS轨道数据解算卫星位置，并与精密星历数据作比较(Calculation of satellite position by using GPS orbit data)