极化合成孔径雷达相干斑抑制极化信息保持能力定量评估

Evaluation of polarimetric information preservation for speckle filtering of polarimetric synthetic aperture radar

针对采用极化特征图主观评估PolSAR相干斑抑制算法的极化信息保持能力存在一定的不足,提出了一种基于极化特征图相关系数的相干斑抑制效果评估方法。该方法实现了对PolSAR相干斑抑制算法极化信息保持能力的定量评估,能够更为精确地反映不同滤波器及滤波参数变化对PolSAR散射特性的影响。仿真数据和实测ESAR数据的相干斑抑制效果评估实验,验证了该方法的有效性。

In order to evaluate quantitively the preservation performance of polarimetric information for PULSAR （Polarimetric Synthetic Aperture Radar） speckle filters, the paper presented an effect evaluation method of PULSAR speckle filtering based on correlation coeglcients between polarization signatures. This method compared correlation coefficients between polarization signatures of targets area from original and filtered PolSAR images. It can achieve quantitative evaluation for the preservation performance of polarimetric information, obtain more accurate result of evaluation for different speckle filters or same speckle filter on different parameters which performance are similar evaluated by polarization signature. Finally, three typically PolSAR speckle filters were used to filter simulation and real PolSAR data respectively. The experimental evaluation results of areas and point targets show that the proposed algorithm has good theoretical and actual performance in effect evaluation of PULSAR speckle filtering.