Synthetic aperture radar(SAR)image has some common features such as huge data volume, relative complex algorithm.

合成孔径雷达（SAR）成像具有数据量巨大、算法比较复杂等特点。

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Because there is speckle noise in SAR image and the background clutter of water is usually very complex, weak target detection is a big challenge for conventional methods.

SAR图像存在相干噪声以及水面背景杂波的复杂性，传统方法对于弱目标检测存在困难。

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