中文说明：
在工程里识别不同FSK和PSK的三阶循环特性的程序，其中最著名的算法！看通信调制识别的人一定看得懂。
English Description：
In the project, the program to identify the third-order cyclic characteristics of different FSK and PSK, among which the most famous algorithm! People who read communication modulation recognition must understand it