基于图像域分块的条带SAR自聚焦算法

A New Algorithm to Strip-Map SAR Autofocus Based on Image Block Processing

文章针对条带合成孔径雷达,提出一种基于图像域分块的自聚焦算法。该算法在图像域进行方位向分子块,采用图像偏移(MD)算法减小相位误差梯度的拼接误差,实现条带SAR图像的自聚焦处理。给出了算法流程,讨论了算法的主要步骤及原理,并利用实测数据对算法进行了验证。实测数据处理结果表明该算法能有效改善条带SAR图像质量。

In this paper, a new algorithm to strip-map SAR autofocus was proposed, which created azimuth sections in the image domain, estimated phase error of azimuth blocks by phase gradient autofocus（PGA）, and reduced the discontinuities of the neighboring segment＇s phase gradient via map drift（MD）. The main steps of the algorithm were discussed and the flow scheme was presented. Real data processing results showed that the new algorithm could improve the strip-map SAR image quality effectively.