High-Frequency Method for Scattering from Coated Targets with Extremely Electrically Large Size in Terahertz Band
High-Frequency Method for Scattering from Coated Targets with Extremely Electrically Large Size in Terahertz Band
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DOI：
10.1080/02726343.2015.1043850
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发表时间：
2015-06
期刊：
影响因子：
0.8
通讯作者：
Houqiang Hua;Yuesong Jiang;Yuntao He
中科院分区：
文献类型：
--
作者：
Houqiang Hua;Yuesong Jiang;Yuntao He
摘要本文提出了一种在太赫兹波段预测超大尺寸涂层目标在自由空间雷达散射截面的高频方法。为了研究粗糙表面涂层目标在太赫兹波段的散射特性，考虑表面粗糙度的影响，对光滑涂层表面的反射系数进行修正，利用修正后的反射系数对表面等效电流和等效磁流进行修正，得到粗糙涂层表面的电磁感应电流密度。因此，将物理光学法与图形电磁计算法相结合，并采用分区显示算法进行改进，可用于求解太赫兹波段粗糙表面涂层目标的散射场，从而获得目标的雷达散射截面。文中给出了几种涂层目标的数值计算结果，如民兵III型洲际弹道导弹的母弹头和VFY-218飞机。研究结果为太赫兹雷达在军事、天文、遥感等领域的应用提供了重要依据和方法。
Abstract This article presents a high-frequency method for the prediction of radar cross-section of coated targets with extremely electrically large size in the terahertz band in free space. To consider the scattering characteristics of the coated targets with a rough surface in the terahertz band, taking into account the effect of surface roughness, the reflection coefficients on the smooth coating surface can be modified; the equivalent electric and magnetic currents on the surface can then be corrected by the modified reflection coefficients to obtain the electric and magnetic induced current densities on the rough coating surface. Therefore the physical optics method, which was combined with the graphical electromagnetic computing method and improved using the partition display algorithm, can be used to solve the scattered fields, and the radar cross-section of the coated targets with a rough surface in the terahertz band can then be obtained. Numerical results for several coated targets, such as the mother warhead of the Minuteman III intercontinental ballistic missile and VFY-218 aircraft, are given and discussed. The results provide an important basis and method for applications of terahertz radar in many fields, such as military, astronomy, and remote sensing, in the future.