逆合成孔径是指雷达天线不动，被观测目标移动，对移动中的目标回波进行相干处理获得大的合成孔径，从而得到高方位尺寸分辨率。逆合成孔径的基础是转台成象。(The inverse synthetic aperture means that the radar antenna is not moving, the target is moved, and the target echo is processed coherently to get the large synthetic aperture, so that the high orientation and size resolution can be obtained. The basis of the inverse synthetic aperture is a turntable image.)