读取GPS中观测文件、导航文件，用以进行卫星坐标计算，伪距单点定位-To read GPS observed in files, navigation files

这是gps载波相位测量中文件，是卫星的精密星历文件，可以用来求卫星坐标-This is the gps carrier phase measurement file, the satellite' s precise ephemeris file that can be used to seek satellite coordinates