数字通信中的锁相环（PLL）完整程序，包括噪声处理，可用于GPS的的跟踪和捕获-the matlab code of PLL ,including how to deal with the noise ,which can be used to acquiring and tracking on GPS

gps信号的跟踪，采用锁相环实现，包括码环的跟踪和载波的跟踪环-gps signal tracking, the use of PLL implementation, including code and carrier tracking loop tracking loop