极化白化滤波器的一种多通道扩展
A Multi-channel Extension of Polarimetric Whitening Filter
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摘要: 为减小相干斑对分类、检测的影响，通常要对极化合成孔径雷达图像进行相干斑抑制。极化白化滤波器(PWF)是利用多个极化通道的复数据抑制相干斑的有效方法，但其输出只有一个通道。为了在后续处理中能够利用全极化数据，该文对PWF进行了改进，提出了多通道极化白化滤波器法(MCPWF)。该方法在保持PWF最少相干斑图像输出的同时，还能得到各个极化通道滤波后的输出。Pi-SAR实测数据的实验结果验证了该方法的有效性。Abstract: In order to reduce the effect of speckle on classification and detection, the polarimetric synthetic aperture radar imagery should be preprocessed to suppress speckle. The Polarimetric Whitening Filter (PWF) is efficient in speckle suppression by using complex data of three polarimetric channels. Nevertheless, it only outputs one channel of data. In this paper, a method called Multi-Channel Polarimetric Whitening Filter (MCPWF) is presented. It maintains the optimal speckle reduction performance of the PWF, and three polarimetric channels of output are obtained as well, so that fully polarimetric data can also be used in advanced processing. The effectiveness of the MCPWF is verified through experimental results of Pi-SAR data.
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