基于迭代KA与射线理论混合算法的油膜覆盖海面电磁散射特性研究

项目名称： 基于迭代KA与射线理论混合算法的油膜覆盖海面电磁散射特性研究

项目编号： No.61301070

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 无线电电子学、电信技术

项目作者： 王蕊

作者单位： 西安电子科技大学

项目金额： 25万元

中文摘要： 海上溢油近年来已成为恶化海洋生态环境的重要海洋灾害。海面溢油量是评价海上溢油事故威胁程度的重要指标，而溢油面积和油膜厚度的准确获得是评估溢油量的基础。鉴于目前微波遥感对溢油厚度反演及边界识别的迫切需求，本项目拟开展不同海况下微波段雷达参数对溢油厚度等的敏感性研究以及油膜厚度、边界估算的物理散射机理研究。具体包括以电磁波与复杂海洋背景相互作用的物理散射机理为基础，基于迭代基尔霍夫近似方法与射线理论混合算法建立油膜覆盖海面电磁散射模型，获取油膜覆盖海面的雷达后向散射回波；通过研究后向回波特性随油膜厚度及特征参量的变化规律，揭示油膜对雷达后向散射回波的阻尼机制，探索雷达参数对油膜厚度及特征参量变化的敏感性问题；进而选定特定雷达参数，在对大量回波数据后向散射特性分析的基础上，开展油膜厚度反演及边界估算的物理散射机理研究，旨在为微波遥感中溢油范围监测及油膜厚度检测方面提供一定的理论依据。

中文关键词： 时变海面；油膜；电磁散射；多普勒谱；多普勒频移

英文摘要： In recent years, marine oil spill has been an important disaster for marine environment. Marine oil spill quantity is the important indicator for evaluating the threat of oil spill, and the oil spill area and film thickness are the key parameters for it. Since oil thickness inversion and boundary recognition are the urgent demands for microwave remote sensing, this project aims to carry out sensitivity analysis of radar parameters on the oil slick thickness in different sea conditions and study the physical scattering mechanism to estimate the thickness and boundary of oil film. Based on the physical mechanism of the interaction between electromagnetic wave and complex ocean environment, the electromagnetic scattering model of sea surface covered with oil film is developed to obtain the monostatic scattering echos using the hybrid algorithm of iterative KA combined with ray theory. The damping mechanism of oil film on the monostatic scattering echos is revealed and the sensitivity analysis of radar parameters on the oil slick thickness, as well as the characteristic parameters is carried out. Finally, the physical scattering mechanism to estimate the thickness and boundary of oil film is studied for some specific radar parameters with the monostatic scattering characteristics analysis of a large amount of datas,

英文关键词： time-varying sea surfaces；oil film；electromagnetic scattering；Doppler spectra；Doppler shift