极化SAR系统噪声影响分析

针对极化SAR系统噪声影响特点，提出从极化SAR图像分类精度及分类图人工解译角度评判系统噪声影响．利用DLR的E—SAR系统获取的单视全极化SAR数据进行实验，对极化SAR系统并行的3个线性极化HH、HV和VV通道加零均值等方差的高斯噪声，模拟雷达系统加性噪声对极化SAR数据的影响．实验结果表明，当图像分类精度降至未加噪声时分类精度的3／4时，加性噪声严重影响极化SAR系统性能．

Analysis of Noise Effects on Polarimetric SAR System

According to the characteristics of noise in the polarimetric SAR system, it was proposed that the noise effects on the system could be evaluated from the angle of classification accuracy of polarimetric SAR image and manually interpreting the classification map. The experiment was done by using the single-look full polarization SAR data, acquired by the DLR E-SAR system, and the effects of additive noise in a radar system on polarimetric SAR data was simulated by adding zero mean and equal variance Gaussian noise to the parallel three linear polarization channels of HH, HV and VV in the polarization SAR system. The experimental results indicate that additive noise affects greatly the performance ofpolarimetric SAR when image classification accuracy reduces to three quarters of the accuracy without additive noise.