该函数是实现Costas环仿真的Matlab编程，具有较好的性能-this function is to achieve Costas Loop Simulation Matlab programming, with good performance

主要是关于GPS卫星C/A码信号的产生、捕获以及跟踪的S曲线图，还有科斯塔斯环的一个实例。-Mainly on the GPS satellite C/A code signal generation, capture and track the S curves, there is an instance of Costas Loop.

利用matlab仿真实现载波的平方环载波同步,costas环载波同步和符号同步.-achieved quadratic loop carrier synchronization, costas loop synchronization and symbol synchronization within matlab