基于文氏改进谱二维海面的电磁散射计算与数据对比  

Comparative Study of the Measured Data and Electromagnetic Scattering from Two-Dimensional Sea Surface Based on Improved Wen's Spectrum

作　　者：吴庚坤 姬光荣[1] 程孝龙[1] 

机构地区：[1]中国海洋大学信息科学与工程学院,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2017年第8期135-139,共5页Periodical of Ocean University of China

基　　金：国家重点基础研究发展计划项目(61320102-1-3)资助~~

摘　　要：基于文氏谱的功率谱理论,结合Donelan分布函数与文氏方向谱的对比结论,提出了一种基于文氏改进谱的二维粗糙海面模型。在经典的双尺度法计算电磁散射的基础上,将二维随机粗糙海面的电磁散射计算结果与Nathanson数据进行对比,分析了不同海况、擦地角、入射频率下,两种极化方式时文氏改进谱二维随机粗糙海面的电磁散射特性。By combining the Wen＇s spectrum and the Donelan＇s experimental conclusion, a two-dimen- sional sea surface model suitable for different depths and different stages of wave growth is proposed based on the classical Monte Carlo algorithm in this paper. In previous works, based on the classic two- scale method for the calculation of sea backscattering coefficient, introducing the simulation results ob- tained by the SSA method, the electromagnetic scattering calculation method was modified. Compared with the fitting result based on the backscattering coefficient model of GIT, it proves that the improved Wen＇s spectrum suits Chinese coastal waves and the proposed electromagnetic scattering theory is accu- rate and efficient. In this paper, based on the classic two-scale method for the calculation of sea back- scattering coefficient, we compared the calculation results with Nathanson＇s measured data, and then analyzed the electromagnetic scattering characteristics of two-dimensional random rough sea-surface un- der different sea states, grazing angle, carrier frequency and polarization mode. In summary, the meth- od in this paper for simulating sea surface based on the classical Monte Carlo algorithm is consistent with the actual sea surface when the sea state changes along with the wind speed and the wind area. On the basis of this work, the backscattering coefficient result calculated by the two scale method is similar to the measured data, and in this paper, the electromagnetic scattering characteristics of two dimensional rough sea surface are in conformity with the actual physical laws. Proved by experiments, the method proposed in this paper is effective, and has the actual physical meaning.

关 键 词：文氏改进谱 双尺度 电磁散射 Nathanson数据 

分 类 号：TN957.51[电子电信—信号与信息处理]