弱小飞机目标检测，利用高通滤波器，对处于高频部分的飞机目标进行处理，用得到的残差图像，获得飞机目标所处的具体方位-Small aircraft target detection, using a high-pass filter in the high frequency portion of the aircraft target for processing, with the residual image, to obtain an airplane which target specif