中文说明： 构成不同频率的调制信号，已调制信号计算其普相关密度，matlab实现了五类灰色关联度模型的计算,使用高阶累积量对MPSK信号进行调制识别，包括广义互相关函数GCC时延估计，结合PCA的尺度不变特征变换(SIFT)算法。
English Description：
The modulated signals with different frequencies are composed, and the general correlation density of modulated signals is calculated. The calculation of five kinds of grey correlation degree model is realized by MATLAB. The modulation recognition of MPSK signals is carried out by using high-order cumulants, including the generalized cross-correlation function GCC time delay estimation and the scale invariant feature transform (SIFT) algorithm of PCA.