读取GPS中观测文件、导航文件，用以进行卫星坐标计算，伪距单点定位-To read GPS observed in files, navigation files

用matlab实现GPS原理和接收机设计中卫星速度和位置坐标的计算。可以输入任意信号发射时间计算。-Realization of GPS principle and the calculation of satellite velocity and position coordinates in the design of the receiver using matlab. Can enter any signal emission time calculation.