利用极化方位角特征的高分辨极化SAR目标增强研究

针对高分辨极化SAR目标增强问题,提出一种利用极化方位角特征的增强方法.首先,利用圆极化法提取极化SAR图像像素点的极化方位角特征;其次,通过"方位角归零化"获得像素点在零度极化方位角下的散射矩阵值.对比归零化前、后目标及杂波区域内部像素点极化特性聚集程度的差异,阐述了利用极化方位角特征进行目标增强的原理;再次,统计获得目标及杂波区域的平均极化特性,采用非线性最优化方法实现了目标增强;最后,基于ADTS全极化SAR实测数据验证了本文方法具有优良的目标增强性能.

Target Enhancement in High-resolution POL-SAR Imagery Using Polarization Orientation Angle Feature

A novel scheme of target enhancement in high-resolution polarimetric SAR imagery is proposed in this paper,which is based on the target's polarization orientation angle feature.Firstly,the specific orientation angle of every pixel in the imagery is extracted using traditional Circular Polarization method.Secondly,a rotation transformation is executed to the scattering matrix of every pixel and the unique scattering matrix form of every pixel at zero orientation angle is obtained.Finally,the target of interesting gains its enhance- ment by means of a non-linear optimization scheme.The validity of the method is indicated by experimental results with ADTS polarime- tric SAR data sets.