随机调制信号下的模拟ppm，包含特征值与特征向量的提取、训练样本以及最后的识别，利用matlab针对图像进行马氏距离计算 。- Random ppm modulated analog signal under Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, Using matlab to calculate the Mahalanobis distance for the image.