这个程序是matlab用来来对锁相环（PLL）进行仿真的，这样的选择基于多方面的考虑-This procedure is used Matlab to the phase-locked loop (PLL) simulation, This choice is based on a number of considerations

二阶锁相环设计中环路参数的选择。详细推导了参数设置。-Two order phase locked loop design of loop parameters selection

二阶和三阶锁相环实现costas环，能够实现载波跟踪-Second and third order phase-locked loop to achieve costas, to achieve carrier tracking

MATLAB仿真，包括CBOC信号产生以及通过锁相环实现信号跟踪，可直接运行！ 接近工程实现思路，可用于fpga实现前功能仿真。((MATLAB simulation, including CBOC signal generation, and through the phase-locked loop to achieve signal tracking, can be directly run.))