Radar (SAR) autofocus processing, whose performance degenerates with low contrast of the scene.This paper proposes an improved RDM for SAR autofocusing.

• 反射率偏移法(RDM)是合成孔径雷达(SAR)自聚焦的经典算法，当场景对比度较低时，RDM自聚焦效果变差。