GPS中C/A码产生函数，该函数可以根据输入的卫星序号，产生系统的32种C/A码。对学习GPS的开发人员有较大帮助。-The GPS C/A code generator function, which can be generated based on the input satellite ID, the system 32 C/A code. On learning GPS developers.

GPS仿真信号的跟踪，程序可以直接运行。卫星编号可以修改-GPS tracking signal simulation, the program can be run directly. Satellite ID can be modified

提取GPS接收机报文中的数据，针对log指令“SATXYZ”，提取报文中GPS卫星的id ,GPS时间，3D坐标，钟差-Extract the data in the GPS receiver message, and extract the id, GPS time, 3D coordinates and clock difference of the GPS satellite in the message for the log instruction SATXYZ