分形粗糙表面涂覆目标太赫兹散射特性

赵华; 郭立新

doi:10.12000/JR17091

分形粗糙表面涂覆目标太赫兹散射特性

doi: 10.12000/JR17091

赵华,
郭立新^,

西安电子科技大学物理与光电工程学院西安 710071

基金项目: 国家自然科学基金(61231003, 61401344)

详细信息

作者简介:
赵　华(1987–)，男，河南南阳人，现为西安电子科技大学物理与光电工程学院博士生，研究方向为计算电磁学、目标与环境复合电磁散射、目标太赫兹散射。E-mail: zhaohuaxynu@163.com

郭立新(1968–)，男，博士，无线电物理学科博士生导师，西安电子科技大学物理与光电工程学院院长，主要研究方向为复杂目标与地海环境电磁散射特性、随机介质中的电波传播特性等。E-mail: lxguo@xidian.edu.cn

通讯作者:
郭立新 lxguo@xidian.edu.cn

中图分类号: O45
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出版历程
- 收稿日期: 2017-10-26
- 修回日期: 2017-12-29
- 网络出版日期: 2018-02-28

Electromagnetic Scattering Characteristics of Fractal Rough Coated Objects in the Terahertz Range

Zhao Hua,
Guo Lixin^,

School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China

Funds: The National Natural Science Fundation of China (61231003, 61401344)

摘要

摘要: 该文采用物理光学法方法研究了具有分形粗糙表面的涂覆目标太赫兹散射特性。基于分形粗糙面建立表面粗糙目标模型，根据菲涅尔反射系数得出表面电流分布进而得到涂覆粗糙目标的雷达散射截面。对比分析了具有粗糙表面和光滑目标的散射结果，详细讨论了不同频率、不同涂层厚度的表面粗糙钝锥目标模型的太赫兹散射特性，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。
- 分形粗糙面 /
- 表面粗糙目标 /
- 太赫兹 /
- 物理光学法
Abstract: Based on the physical optics method, the scattering characteristics of fractal rough surface coated objects are studied in the terahertz (THz) range herein. A blunt model based on fractal rough surfaces is built. The surface current is calculated according to the Fresnel reflection coefficient, and the Radar Cross Section (RCS) of the rough coated target is obtained. The RCS of rough and smooth surface targets are compared. Numerical results for a rough coated blunt cone model are provided, and discussed from the perspective of different frequencies and coating thickness values. The results show that the surface roughness of the target has a significant effect on scattering in the terahertz range.
- Fractal rough surface /
- Rough surface target /
- Terahertz /
- Physical optics

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图 1 1维分形粗糙面

Figure 1. One dimensional fractal rough surface

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图 3 表面涂覆目标示意图

Figure 3. Local coordinate systems for PO calculation with coating dielectric

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图 4 涂覆半球模型双站RCS

Figure 4. Bistatic RCS of the verification models

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图 5 导体立方体模型单站RCS

Figure 5. Mono-static RCS of the PEC cube model

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图 2 表面分形粗糙钝锥模型

Figure 2. The roughness surface targets model

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图 6 钝锥模型单站RCS

Figure 6. Mono-static RCS of the coated blunt cone model with different incident frequency

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图 7 不同涂覆厚度的钝锥单站RCS

Figure 7. Mono-static RCS of the blunt cone models coated with different thicknesses

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图 8 不同入射频率钝锥模型单站RCS

Figure 8. Mono-static RCS of the coating blunt cone models with different incident frequency

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图 9 不同粗糙度圆柱模型单站RCS

Figure 9. Mono-static RCS of the cylinder models with different $\delta $

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图 10 不同粗糙度锥柱模型单站RCS

Figure 10. Mono-static RCS of the cone-cylinder models with different $\delta $

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