粗糙面后向散射的基尔霍夫标量近似法研究

摘要

实际的粗糙面由高斯型粗糙来模拟,结合高斯型粗糙面的相关系数,依据基尔霍夫标量近似法给出了高斯型粗糙面后向散射系数表达式,通过数值计算得到了后向散射系数随入射角及入射波波长的变化曲线,分析了粗糙面高度起伏均方根、相关长度、介质介电常数、入射波波长对后向散射系数的影响,得到了较完整的高斯粗糙面后向散射特征.%A Gaussian rough surface is proposed for describing the practical rough surface.Combined with the correlation coefficient of the Gaussian rough surface,the Gaussian rough surface backscattering coefficient is derived using Kirchhoff scalar approximation.The curves of the backscattering coefficient changing with the incident angle and the incident wave wavelength are obtained by the numerical calculation.The influences of the height mean square root,the correlation length of rough surface,the permittivity of medium,the wavelength of the incident wave on the backscattering coefficient are analyzed and further the more systematical Ganssian rough surface backscattering characteristics are obtained.