可以实现GPS卫星坐标的计算，对于想用C#语言学习GNSS仿真的同学是不错的参考-Can calculate the GPS satellite coordinates, for those who want to use C# language learning students GNSS simulation is a good reference

读取GNSS卫星精密星历Sp3文件。传入精密星历文件地址，便可以进行精密星历数据读取，读取完成后按卫星、时间、X、Y、Z格式存储在表结构中，以表的形式返回以供使用。-Reads the GPS satellite precise ephemeris Sp3 file. Incoming precise ephemeris file address, you can read the ephemeris data. Read as format of satellite number, time,