rinex文件格式的详细说明，对读取rinex格式的GNSS文件很有帮助，包含个文件块内容，结构体设置等内容。-a detailed descr iption of the rinex file format, helpful of GNSS read rinex format file that contains the file content, structure, body settings.

导航读观测值程序，包含读取头文件和观测内容等部分。-Read the observations navigation procedures, including reading the contents of the header files and some other observations.

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