A NEW POLSAR SHIP DETECTION METRIC FUSED BY POLARIMETRIC SIMILARITY AND THE THIRD EIGENVALUE OF THE COHERENCY MATRIX

作者：Xi Yuyang; Zhang Xi; Quan Lai; Li Wei; Lang Haitao^*

来源：36th IEEE International Geoscience and Remote Sensing Symposium (IGARSS), 2016-07-10 to 2016-07-15.

• Polarimetric similarity
• Scattering mechanism
• PolSAR
• CFAR
• Ship detection

In this paper, we address the problem of ship detection in PolSAR image. We firstly investigate the differences of scattering mechanism between ship targets and the sea surface based on the polarimetric similarity analysis. It is shown that, the sea surface scattering is dominated by the odd bounce (denoted as r(1)), while the scattering of ship targets are both dominated by the even bounce scattering (r(2)) which has been widely accepted, and the line bounce scattering (r(4)) which is a new find from the experiments. Based on those differences, a metric (r(2) + r(4))/r(1) can be applied to distinguish ship targets from the sea surface. To further suppress the effects of side-lobes and imaging artifacts which have the same/similar scattering behaviors with ship targets, we introduce in the third eigenvalue (lambda(3)) of the coherency matrix and obtain the metric (r(2) + r(4))lambda(3)/r(1). The preliminary results show that a constant false alarm rate (CFAR) ship detector based on the proposed metric can obtain promising ship detection performance.

• 出版日期2016
• 单位北京化工大学; 南京大学; 国家海洋局第一海洋研究所; 内蒙古师范大学