通过读取RINEX2版本文件，进行伪距单点定位位置解算，并以文件形式输出(By reading the RINEX2 version file, the pseudo-range single-position positioning is solved and output as a file.)

首先根据卫星PRN号读取精密星历文件内容，然后通过朗格朗日内插计算出卫星的位置，里面含有sp3文件和exe程序(First read the contents of the precise ephemeris file according to the satellite PRN number, and then calculate the position of the satellite by Lange Lange interpolation, which contains sp3 fil