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长度归一化扫描的合成孔径雷达图像船舶尾迹恒虚警率检测

DOI: 10.11834/jig.20130916

Keywords: 合成孔径雷达,船舶尾迹检测,长度归一化扫描,恒虚警率

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Abstract:

提出一种基于长度归一化扫描的合成孔径雷达(SAR)图像船舶尾迹检测算法。存在距离向运动分量的船舶在SAR图像上会发生方位向偏移,那么尾迹的起点必在方位向上这一偏移量范围内。根据这一物理事实,将尾迹检测的搜索范围限定在可能为尾迹的线段上,从而提高了检测效率。算法通过利用线性积分和长度归一化这两个方法将矩形滑动窗口下的线性特征检测转化为了点特征检测,并通过经典的虚警率(CFAR)检测理论实现检测结果的输出。利用COSMO-SkyMed数据对该算法进行了实验验证,实验结果表明,该算法在尾迹检测上具有检测能力强、速度快的优点,船舶速度反演具有较高精度。

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