中文说明：本代码实现伪距单点定位，使用语言为matlab语言。包含几个m文件，简单易度，附带数据。定位精度可在5米左右，算法简单，考虑了地球自转、相对论效应以及卫星发射时间等因素。主函数为main函数，里面有一些文件是一些拓展文件，程序不需要
English Description：
This code realizes pseudo range single point positioning, using MATLAB language. Contains several m files, easy to use, with data. The positioning accuracy can be about 5 meters, and the algorithm is simple, taking into account the earth rotation, relativistic effect, satellite launch time and other factors. Main function for the main function, there are some files are some expansion files, the program does not need