基于PM谱的二维各向异性海面电磁散射的微扰法研究

运用微扰法研究了基于PM谱的二维各向异性海面电磁散射问题,结合其功率谱推导出了平面电磁波入射时的散射系数表达式。通过数值计算得到了HH极化下双站散射系数随散射角变化的曲线,讨论了摩擦风速、风区范围、海面上方10 m高度处的风速、观察方向与逆风方向之间夹角和入射波频率对双站散射系数的影响,得到了基于PM谱的二维各向异性海面电磁散射的基本特征、分区特征和随频率变化的特征。

Electromagnetic Scattering from 2D Anisotropic Sea Surface with PM Spectrum Using the Small Perturbation Method

The electromagnetic scattering from the 2D anisotropic sea surface with PM spectrum is studied using the small perturbation method,and the formula of the scattering coefficient with plane wave incidence is derived combined with the power spectral density of the 2D anisotropic sea surface. The angular distribution of the bistaticscattering coefficient of HH polarization are obtained by numerical implementation,the influence of the friction wind speed,wind region,the wind speed at height of ten meters on the sea,the angle between observational direction and upwind direction and the frequency of the incident wave on the bistaticscattering coefficient is discussed. The basic characteristics,the zonal characteristics and the characteristics with varying of incident wave frequency that the electromagnetic scattering from the 2D anisotropic sea surface with PM spectrum are obtained.