紧缩极化合成孔径雷达反演海面风矢量方法研究

项目名称： 紧缩极化合成孔径雷达反演海面风矢量方法研究

项目编号： No.41306189

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 天文学、地球科学

项目作者： 李海艳

作者单位： 中国科学院大学

项目金额： 25万元

中文摘要： 高分辨率海面风矢量场，在研究风场动力学、提高海洋、大气及其耦合模式精度、建立海上风力发电场等方面具有广泛应用。紧缩极化合成孔径雷达(SAR)是一种新近提出的SAR系统，可以克服全极化SAR数据量大、能耗高、覆盖面积小等缺点，并保留大部分极化信息，可有效用于海面高分辨率风矢量场反演。本项目拟基于大量RADARSAT-2全极化SAR数据，分析不同海况、不同成像几何下，重构伪全极化信息的最优紧缩极化模式；结合X-Bragg散射模式，改进重构算法，提高交叉极化重构精度，进行重构伪全极化资料海面风场反演研究。基于电磁波散射传输理论和双尺度模型，建立紧缩极化SAR Stokes参量与海面风场的关系，提出紧缩极化SAR海面风矢量反演新方法，实现紧缩极化SAR海洋动力参数反演，为紧缩极化SAR反演海面风场业务化应用打下基础。

中文关键词： 紧缩极化SAR；重构算法；Stokes向量；m-χ分解；

英文摘要： High resolution ocean wind vector has wide applications in studying the wind field dynamics, improving the accuracy of the ocean, atmosphere and couple model and establishing the wind farm on the ocean. A recently proposed compact polarimetric SAR (Synthetic Aperture Radar) can be used for ocean wind vector inversion effectively, for it can keep almost all the fully polarimtric information with wide swath and overcome the disadvantages of fully polarimtric SAR, such as large data storage, high energy consumption, small covering. Based on a large number of RADARSAT-2 polarimetric SAR data, the reconstruction capability and accuracy of the pseudo fully polarimetric SAR data are analyzed on the different sea states, different imaging geometry with different compact polarimetric modes; combined with the X-Bragg scattering model, the reconstruction method and the cross-polarization reconstruction precision will be improved. The inversion ability of sea surface wind vector from pseudo fully polarimetric data is evaluated. Based on scattering theory of electromagnetic wave and double-scale scattering model, the relationship between SAR Stokes parameters and wind vector is established. A new ocean wind vector inversion method from compact polarimetric SAR is proposed. It will realize the ocean dynamic parameter inversio

英文关键词： Compact polarization (CP) SAR；reconstruction method；Stokes vector；m-χ decomposition；