多强点目标场景合成孔径声纳SAS自聚焦算法研究

经典的PGA算法不能直接用于SAS图像自聚焦。目前的一些改进算法非常复杂,鲁棒性不好。本文提出了一种基于图像分块的改进PGA算法。算法的原理简便,鲁棒性好。并利用图像质心不变的假设,解决了线性相位引起的图像方位位置偏移问题。最后,通过仿真试验,验证了算法的有效性。

SAS Autofocus Algorithm Based on Strong Targets

The art of state PGA algorithm can not be directly used in SAS image autofocus area. Some now improved algorithms are very complex and lack of robust. We present an improved PGA algorithm based on image patch. The principle of the algorithm is simple and robust. More, based on the assumption that image cancroids is changeless, we resolve the image azimuth shift problem caused by linear phase errors. At last, simulation results confirm the efficiency of the algorithm.