高斯粗糙表面涂覆目标太赫兹散射特性

doi:10.3969/j.issn.1001-2400.2018.01.005

摘要/Abstract

摘要：

采用基于基尔霍夫近似的物理光学方法，研究了具有高斯粗糙表面的涂覆目标太赫兹散射特性．基于高斯粗糙面建立表面粗糙圆锥和锥柱目标模型，根据入射波频率对模型进行剖分以满足物理光学的计算要求．根据菲涅尔反射系数得出表面电流，进而计算涂覆粗糙目标的雷达散射截面．对比分析了粗糙表面目标与光滑目标的散射结果，详细讨论了不同涂覆介质、不同涂层厚度、不同入射角度、不同频率以及不同粗糙度的粗糙表面圆锥目标和锥柱目标的太赫兹散射特性．计算结果表明，在太赫兹波段目标表面的粗糙度对散射有显著的影响．

关键词: 高斯粗糙面, 表面粗糙目标, 太赫兹, 物理光学

Abstract:

The scattering characteristics of Gaussian roughness surface coated targets are studied in the terahertz (THz) band based on the Kirchhoff approximation and the physical optics (PO) method. Based on the Gaussian roughness surface, roughness surface cone and cone-cylinder models are built which are meshed according to the frequency of the incident wave to meet the PO calculation requirements. According to the Fresnel reflection coefficient, the current on the surface is calculated, and then the radar cross section (RCS) of the coating rough target is obtained. The RCS of the rough surface target are compared with the smooth target. Numerical results for the rough coated cone model and cone-cylinder model are given and discussed from different coating dielectric media, different coating thickness values, different angles of incidence, different frequencies, and different roughness values. The results show that the roughness of the target surface in the terahertz band has a significant effect on the scattering.

Key words: Gaussian rough surface, roughness surface target, terahertz, physical optics

赵华;郭立新. 高斯粗糙表面涂覆目标太赫兹散射特性[J]. 西安电子科技大学学报, 2018, 45(1): 23-29.

ZHAO Hua;GUO Lixin. Electromagnetic scattering characteristic of Gaussian rough coated objects in terahertz[J]. Journal of Xidian University, 2018, 45(1): 23-29.

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