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拉布拉多海一年平整冰厚度SAR反演算法
刘眉洁,戴永寿,张杰,张晰,孟俊敏
0
(中国石油大学信息与控制工程学院,山东青岛 266580;国家海洋局第一海洋研究所,山东青岛 266061;青岛大学物理科学学院,山东青岛 266071)
摘要:
在利用实测一年平整冰厚数据和同步全极化RADARSAT-2SAR影像、全面分析不同SAR极化参数对海冰厚度敏感度的基础上,发现Alpha角最高;从理论上证实利用两者相关性反演冰厚的可行性,将所得经验方程用于冰厚反演,其结果与实测数据吻合较好;与现有常用方法的反演结果进行对比表明,新方法误差较小;Alpha角可以用于一年平整冰厚度反演,证明全极化SAR海冰信息反演冰厚确有优势。
关键词:  海冰厚度  Alpha角  海冰厚度反演算法  极化SAR  极化散射特性  拉布拉多海
DOI:10.3969/j.issn.1673-5005.2014.03.031
投稿时间:2013-08-27
基金项目:国家自然科学基金青年基金项目(41306193);国家自然科学基金项目(60890075);海洋公益性项目(201105016)
First-year level sea-ice thickness retrieval in Labrador Sea using C-band polarimetric SAR data
LIU Mei-jie,DAI Yong-shou,ZHANG Jie,ZHANG Xi,MENG Jun-min
(College of Information and Control Engineering in China University of Petroleum, Qingdao 266580, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China;College of Physics in Qingdao University, Qingdao 266071, China)
Abstract:
Polarimetric scattering characteristics of synthetic aperture radar (SAR) have been recently applied to sea-ice thickness retrieval, however some features implicit in the quad-polarization SAR data have not been fully utilized. Therefore, the ability of the polarimetric characteristics responding to sea-ice thickness was explored using first-year level sea-ice thickness measurements and synchronous quad-polarization RADARSAT-2SAR images. It is found that the alpha angle is sensitive to sea-ice thickness. Their correlation is validated theoretically, and the sea-ice thickness inverted using the empirical relations agrees well with the measurements. The errors using this approach are small compared with those by commonly used methods. The study results confirm the role of the alpha angle in year round level sea-ice thickness retrieval, and the advantage of sea-ice thickness retrieval using the information derived from quad-polarization SAR data.
Key words:  sea-ice thickness  Alpha angle  sea-ice thickness retrieval  polarimetric synthetic aperture radar  polarimetric scattering characteristics  Labrador Sea
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