辽东湾海冰类型SAR响应分析

Liaodong Bay Sea Ice Types SAR Response Analysis

利用2005-2006年冬季辽东湾海冰双极化ENVISAT ASAR影像时间序列,分析了不同极化方式的ASAR影像对辽东湾海冰的探测能力,结果发现交叉极化图像由于其后向散射动态范围小,限制了其在辽东湾海冰分类中的应用。同时利用SAR图像,结合同步TM数据,开展辽东湾海域不同类型海冰的电磁特性响应分析研究,指出SAR能较好识别固定冰、平整冰和碎冰堆积区,但在探测初生冰时并不可靠,其探测结果与海冰生长阶段以及海冰周围环境条件有关,同时由于受分辨率限制并不能识别莲叶冰等海冰类型。

The dual-polarization ENVISAT ASAR Liaodong Bay 2005-2006 winter sea ice images in time sequence in were analyzed to study the ice detection capabilities of different polarization SAR images, and the results showed that the alternating polarization images were not suitable for ice classification due to their small backscattering dynamic ranges. Then the electromagnetic property response of different kinds of sea ice in Liaodong Bay were studied by using the SAR images and synchronous TM images. It was pointed out that SAR image could detect fast ice, level ice and deposited trash ice,but it was not reliable in detecting new ice, and the detecting result was affected by the growth phase of ice and its surrounding environment. And it also could not identify some types of ice like cake ice, due to the limitation of spatial resolution.