极化合成孔径雷达图像目标去定向性质及应用

Properties and applications of target's deorientaion in polarimetric SAR images

定向角是极化合成孔径雷达(SAR)图像的一个重要参数。去定向在一定程度上可以降低目标随机取向的影响。目标去定向后,有些极化参数会改变,有些保持不变。本文对去定向理论进行了小结,讨论了极化SAR图像目标去定向的性质,分析了去定向前、后二次散射系数的变化趋势。分别以这2个指标对极化SAR数据进行分类比较,结果表明后者能较好地区分3种常见的散射目标。

Orientation-angle-is-an-important-parameter-in-polarimetric-Synthetic-Aperture-Radar(SAR)-imagery.-The-deorientation-process-may-reduce-the-fluctuant-influence-of-randomly-distributed-orientation-angles.-After-deorientation,-some-polarimetric-parameters-will-be-changed-and-others-will-remain-unchanged.-In-this-paper,-the-deorientation-theory-is-summarized-and-the-properties-of-deorientation-process-are-discussed.-The-impacts-on-the-double-bounce-scattering-coefficients-are-analyzed.-The-double-bounce-scattering-coefficients-before-and-after-deorientation-are-used-for-polarimetric-SAR-image-classification.-Results-show-that-the-latter-can-distinguish-three-different-scattering-mechanisms-well.