GPS伪距单点定位，包括导航文件、观测文件、精密钟差和精密星历的读取，对流层Hopfield模型，电离层K8模型，采用最小二乘法，最后通过调用matlab来计算测站坐标。对GPS编程初学者是很好的编程哦。-GPS pseudorange point positioning, including navigation documents, observation files, precision clock bias and precision ephemeris read, Hopfield m

本程序用于读取GPS中精密星历SP3文件，得到各个卫星的坐标序列-read the sp3 file of GPS

读取IGS文件（观测文件*.*o 广播星历*.*n；精密星历*.sp3；修正电离层对流层）。均是matlab函数形式，可直接用于GPS matlab数据处理-reading IGS files (oberservation file*.*o navigation files*.*n precise orbit*.sp3) correct errors of Ionosphere delay and Tropsphere delay

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