Abstract: Speckle suppression becomes a hot topic in SAR image processing field, which is a key step in SAR image interpretability and application. Therefore, the speckle suppression algorithm in SAR images has important research value. Mechanism and mathematic model of SAR image speckle suppression are briefly introduced, the new research results are summarized, the spatial filtering method and transform filtering method are analyzed. Considering the feasibility of algorithm, the analysis and evaluation for representational image speckle suppression methods are carried out and some common indexes for evaluating the effect of speckle suppression are summed up. The further development of SAR image speckle suppression in the future is discussed.

Key words: Synthetic Aperture Radar（SAR）, speckle suppression, spatial filtering, transform filtering

摘要： 相干斑抑制是SAR图像处理领域的研究热点之一，也是SAR图像解译和应用中的关键步骤，因此SAR图像的相干斑抑制算法具有重要的研究价值。在简要介绍SAR图像相干斑的产生机理和数学模型的基础上，综述了国内外相干斑抑制的最新研究成果，重点分析了空域滤波和变换域滤波两类方法。从算法的可行性角度出发，分析了几种具有代表性的相干斑抑制方法及其优缺点，总结了常用相干斑抑制效果评价指标，最后对今后工作方向进行了展望。

关键词: 合成孔径雷达, 相干斑抑制, 空域滤波, 变换域滤波