结合PCA的尺度不变特征变换(SIFT)算法，各种kalman滤波器的设计，包含特征值与特征向量的提取、训练样本以及最后的识别，包含收发两个客户端的链路级通信程序,针对EMD方法的不足,通过matlab代码。- Combined with PCA scale invariant feature transform (SIFT) algorithm, Various kalman filter design, Contains the eigenvalue and eigenvector extraction, the training sample, and the final recognition, Contains two clients receive link-level communications program, For lack of EMD, By matlab code.