﻿ 分形粗糙表面涂覆目标太赫兹散射特性
«上一篇
 文章快速检索 高级检索

 雷达学报  2018, Vol. 7 Issue (1): 91-96  DOI: 10.12000/JR17091 0

引用本文

Zhao Hua, Guo Lixin. Electromagnetic scattering characteristics of fractal rough coated objects in the terahertz range[J]. Journal of Radars, 2018, 7(1): 91-96. DOI: 10.12000/JR17091.

文章历史

(西安电子科技大学物理与光电工程学院   西安   710071)

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)
Foundation Item: The National Natural Science Fundation of China (61231003, 61401344)
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.
Key words: Fractal rough surface    Rough surface target    Terahertz    Physical optics
1 引言

2 表面粗糙目标模型 2.1 分形粗糙面

1维带限Weierstrass-Mandelbrot分形函数的表达式为：

 图 1 1维分形粗糙面 Fig.1 One dimensional fractal rough surface
2.2 分形表面粗糙目标模型

 图 2 表面分形粗糙钝锥模型 Fig.2 The roughness surface targets model

2.3 算法理论

 图 3 表面涂覆目标示意图 Fig.3 Local coordinate systems for PO calculation with coating dielectric

3 数值结果及讨论 3.1 验证算例

 图 4 涂覆半球模型双站RCS Fig.4 Bistatic RCS of the verification models
 图 5 导体立方体模型单站RCS Fig.5 Mono-static RCS of the PEC cube model

3.2 数值结果

 图 6 钝锥模型单站RCS Fig.6 Mono-static RCS of the coated blunt cone model with different incident frequency

 图 7 不同涂覆厚度的钝锥单站RCS Fig.7 Mono-static RCS of the blunt cone models coated with different thicknesses

 图 8 不同入射频率钝锥模型单站RCS Fig.8 Mono-static RCS of the coating blunt cone models with different incident frequency

 图 9 不同粗糙度圆柱模型单站RCS Fig.9 Mono-static RCS of the cylinder models with different $\delta$

 图 10 不同粗糙度锥柱模型单站RCS Fig.10 Mono-static RCS of the cone-cylinder models with different $\delta$
4 结论

 [1] Episkopou E, Papantonis S, Otter W J, et al.. Defining material parameters in commercial EM solvers for arbitrary metal-based THz structures[J]. IEEE Transactions on Terahertz Science and Technology, 2012, 2(5): 513-524. DOI:10.1109/TTHZ.2012.2208456 (0) [2] Kirley M P and Booske J H. Terahertz conductivity of copper surfaces[J]. IEEE Transactions on Terahertz Science and Technology, 2015, 5(6): 1012-1020. DOI:10.1109/TTHZ.2015.2468074 (0) [3] Li Z, Cui T J, Zhong X J, et al.. Electromagnetic scattering characteristics of PEC targets in the terahertz regime[J]. IEEE Antennas and Propagation Magazine, 2009, 51(1): 39-50. DOI:10.1109/MAP.2009.4939018 (0) [4] Danylov A A, Goyette T M, Waldman J, et al.. Terahertz inverse synthetic aperture radar (ISAR) imaging with a quantum cascade laser transmitter[J]. Optics Express, 2010, 18(15): 16264-16272. DOI:10.1364/OE.18.016264 (0) [5] Younus A, Desbarats P, Bosio S, et al.. Terahertz dielectric characterisation of photopolymer resin used for fabrication of 3D THz imaging phantoms[J]. Electronics Letters, 2009, 45(13): 702-703. DOI:10.1049/el.2009.0688 (0) [6] 张存林, 牧凯军. 太赫兹波谱与成像[J]. 激光与光电子学进展, 2010, 47(2): 023001 Zhang Cun-lin and Mu Kai-jun. Terahertz spectroscopy and imaging[J]. Laser & Optoelectronics Progress, 2010, 47(2): 023001 (0) [7] 杨洋, 姚建铨, 张镜水, 等. 粗糙铜表面对低频太赫兹波的散射实验[J]. 红外与毫米波学报, 2013, 32(1): 36-39, 79. Yang Yang, Yao Jian-quan, Zhang Jing-shui, et al.. Terahertz scattering on rough copper surface[J]. Journal of Infrared and Millimeter Waves, 2013, 32(1): 36-39, 79. DOI:10.3724/SP.J.1010.2013.00036 (0) [8] 杨洋, 景磊. 金属介电常数对雷达目标散射截面的影响[J]. 激光与红外, 2013, 43(2): 155-158. Yang Yang and Jing Lei. Impact of the metal permittivity on radar target scattering cross section[J]. Laser & Infrared, 2013, 43(2): 155-158. DOI:10.3969/j.issn.1001-5078.2013.02.008 (0) [9] 程志华, 谢拥军, 马晓东, 等. 介质目标的太赫兹波近场散射特性计算[J]. 电子与信息学报, 2015, 37(4): 1002-1007. Cheng Zhi-hua, Xie Yong-jun, Ma Xiao-dong, et al.. Near-field electromagnetic scattering characteristics of dielectric targets in the terahertz regime[J]. Journal of Electronics & Information Technology, 2015, 37(4): 1002-1007. DOI:10.11999/JEIT140807 (0) [10] 江月松, 聂梦瑶, 张崇辉, 等. 粗糙表面涂覆目标的太赫兹波散射特性研究[J]. 物理学报, 2015, 64(2): 94-100. Jiang Yue-song, Nie Meng-yao, Zhang Chong-hui, et al.. Terahertz scattering property for the coated object of rough surface[J]. Acta Physica Sinica, 2015, 64(2): 94-100. DOI:10.7498/aps.64.024101 (0) [11] Mandelbrot B B. The Fractal Geometry of Nature[M]. New York: Macmillan, 1983. (0) [12] Michopoulos J G, Young M and Iliopoulos A. A multiphysics theory for the static contact of deformable conductors with fractal rough surfaces[J]. IEEE Transactions on Plasma Science, 2015, 43(5): 1597-1610. DOI:10.1109/TPS.2015.2416980 (0) [13] Iodice A, Natale A and Riccio D. Kirchhoff scattering from fractal and classical rough surfaces: Physical interpretation[J]. IEEE Transactions on Antennas and Propagation, 2013, 61(4): 2156-2163. DOI:10.1109/TAP.2012.2236531 (0) [14] 李昌泽, 童创明, 王童, 等. 不稳定表面粗糙目标的太赫兹波段散射特性分析[J]. 强激光与粒子束, 2016, 28(4): 043101 Li Chang-ze, Tong Chuang-ming, Wang Tong, et al.. Analysis of teraherta wave scattering characteristics of unstable rough surface target[J]. High Power Laser and Particle Beams, 2016, 28(4): 043101 DOI:10.11972/j.issn.1001-9014.2016.02.020 (0) [15] Yin H C, Huang P K, Liu X G, et al.. PO solution for scattering by the complex object coated with anisotropic materials[J]. Journal of Systems Engineering and Electronics, 2003, 14(2): 1-7. (0) [16] Li X, Xie Y and Yang R. High-frequency method for scattering from coated targets with electrically large size in half space[J]. IET Microwaves, Antennas & Propagation, 2009, 3(2): 181-186. (0)