结合PCA的尺度不变特征变换(SIFT)算法，实现了对10个数字音的识别程序合成孔径雷达（SAR)目标成像仿真，表示出两帧图像间各个像素点的相对情况，旋转机械二维全息谱计算。- Combined with PCA scale invariant feature transform (SIFT) algorithm, Realization of 10 digital audio recognition program Synthetic Aperture Radar (SAR) imaging simulation target, Between two images showing the relative circumstances of each pixel, Rotating machinery 2-d holographic spectrum calculation.