读取精密星历文件，方便快捷，代码简单易懂-Read precise ephemeris file, convenient, easy to understand code

一次性读取Rinex格式精密星历文件所有内容的类实现-Read content of precise ephemerise file (Format: Rinex) all by once

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,

读取精密星历文件、还可获取不同采样率的钟差差值结果，如30s，300s。(Read the precise ephemeris file and get the difference between the clock difference of different sampling rates, such as 30s, 300s.)