考虑海杂波特征的SAR图像海上运动小目标检测方法

Small moving target detection method considering sea clutter feature in SAR images

鉴于海杂波是一种非平稳性雷达信号,使用传统方法容易受到海杂波特征影响,导致检测结果不精准。充分考虑海杂波特征,提出了SAR图像海上运动小目标检测方法。根据雷达观测场景等距离环,确定波浪传播方向,分析海杂波特征。构建最优自适应海杂波抑制权矢量函数,结合约束最小方差准则抑制海杂波,避免慢速目标难以被有效检测。计算节点邻域内每个像素点到节点的距离,筛选孤立像素点。充分考虑海杂波特征,使用统计平均方式获取海杂波背景下的平均干涉幅度和相位,以此为依据检测运动小目标。实验结果表明,该方法在正常、中等和复杂海况下,检测结果与实际结果一致,说明使用该方法检测结果精准。

Sea clutter is a kind of non-stationary radar signal,and the traditional method is easy to be affected by sea clutter characteristics,resulting in inaccurate detection results.Considering the sea clutter feature,a small moving target detection method in SAR images is proposed.According to the isometric ring of radar observation scene,the wave propagation direction is determined and the sea clutter feature is analyzed.The optimal adaptive sea clutter suppression weight vector function is constructed,and the minimum variance constraint is used to suppress sea clutter quasi-to avoid the slow target being difficult to detect effectively.The distance from each pixel in the neighborhood of a node to the node is calculated,and isolated pixels are screened.Considering the sea clutter characteristic,the average interference amplitude and phase under the sea clutter background are obtained by means of statistical averaging,which is used to detect the moving small target.The experimental results show that the detection results are consistent with the actual results under normal,medium and complex sea conditions,indicating that the detection results of the method are accurate.