直接按定义计算的互相关函数，若，则求出的是自相关，为复序列。-Calculated according to the definition of direct cross-correlation function, if, then calculated the autocorrelation for the complex sequence.

产生m序列，计算自相关和互相关函数~（这是源码，但是我放在了word中储存）-create m sequence，calculated the crossrelation ~