高斯粗糙面电磁散射的基尔霍夫驻留相位法研究

采用高斯粗糙面来模拟实际粗糙面,根据基尔霍夫驻留相位近似法研究了粗糙面的电磁散射,结合高斯粗糙面的自相关函数导出了高斯粗糙面后向散射系数和不同极化状态双站散射系数计算公式.通过数值计算得到了后向散射系数随入射角变化的曲线和不同极化状态双站散射系数随散射角、散射方位角及入射波频率变化的曲线,讨论了介质介电常数、粗糙面参数对后向散射系数和双站散射系数的影响、入射波频率对双站散射系数的影响,得出了高斯粗糙面散射系数的基本特征.结果表明介质介电常数和粗糙面参数对高斯粗糙面后向散射系数和双站散射系数有明显影响且非常复杂,而入射波频率则对双站散射系数无影响.

Study on the Electromagnetic Scattering from Gaussian Rough Surface Using the Kirchhoff Stationary-Phase Approximation

A Gaussian rough surface is presented for describing the nature rough surface,the electromagnetic scattering from Gaussian rough surface is studied and formulae of the backscattering and bistaticscattering coefficient for different polarization is presented according to the Kirchhoff StationaryPhase Approximation with considering the autocorrelation function of the Gaussian rough surface.The curves of the backscattering coefficient with varying of the incident angle and the bistaticscattering coefficient for different polarization with varying of the scattering angle,the scattering azimuth angle and the frequency of the incident wave is obtained by numerical implementation,the influence of the dielectric constant,rough surface parameters on the backscattering and bistaticscattering coefficient and the frequency of the incident wave on the bistaticscattering coefficient is discussed,the basic characteristics of the backscattering and the bistaticscattering coefficient for Gaussian rough surface is obtained.The numerical results show that the influence of the dielectric constant and the roughness parameters on the backscattering and bistaticscattering coefficient of the Gaussian rough surface is obvious and very complex,but the influence of the incident frequency on the bistaticscattering coefficient of the Gaussian rough surface is nothing.