这是用C++语言编写的程序，主要对于gps观测文件进行读取。-It is written in C++ program, the main observation files for gps reading.

解决导航文件N,O文件读取，计算卫星的误差，实现单点定位(Solve the navigation file N, O file reading, calculate the satellite error, and realize single-point positioning)