Karam Mostafa A, McDonough Ryan S
ASRC Federal Technical Services.
NASA Glenn Research Center.
ITU J (Geneva). 2019 Nov 19;2(1).
This study provides explicit mathematical formulations for the bistatic scattering coefficient from a randomly rough surface with a complex relative permittivity based on the following analytic models: small perturbation model (SPM), physical optics model (PO), and Kirchhoff approximation model (KA). Then it addresses the two shortcomings associated with each of the three models: i) limited applicability domain, and ii) null predicted values for the cross polarized bistatic scattering coefficients within plane of incidence. The plane of incidence contains both backscattering direction and forward (specular reflection) direction which are of interest to the spectrum community.
本研究基于以下解析模型，为具有复相对介电常数的随机粗糙表面的双基地散射系数提供了明确的数学公式：小扰动模型（SPM）、物理光学模型（PO）和基尔霍夫近似模型（KA）。然后，该研究阐述了与这三种模型中的每一种相关的两个缺点：i）适用范围有限，以及ii）在入射面内交叉极化双基地散射系数的预测值为零。入射面包含了频谱学界感兴趣的后向散射方向和前向（镜面反射）方向。
