非均匀不稳定表面粗糙目标的太赫兹波段散射特性分析

Analysis of terahertz wave scattering characteristics of non-uniform unstable roughness surface target

研究了不同粗糙度的非均匀不稳定表面粗糙导体目标在太赫兹波段的散射特性,区别于采用经验公式的建模方法,提出把随机粗糙面的建模理念应用到太赫兹波段的非均匀不稳定表面粗糙目标的建模中,用描述随机粗糙面的均方根高度(h)和相关长度(l)两个物理量来调节目标表面的粗糙度变化.首先用高斯随机粗糙面模拟非均匀不稳定粗糙目标的表面,然后采用物理光学和等效电流相结合的方法进行仿真计算,分别对不同入射角、不同频率和不同粗糙度的不同非均匀不稳定表面粗糙导体目标,在太赫兹波段散射特性进行了分析,最后得出相关的结论.

The Electromagnetic（ EM） scattering characteristics in terahertz（ THz） band of non-uniform unstable electrical conducting target with different roughness surface is studied in this paper. The modeling concept of randomly rough surface is applied to model the target with non-uniform unstable roughness surface. Here,the root mean square（ RMS） height and the correlation length of rough surface are applied to describe the roughness of different target surfaces. Firstly,the Gaussian surface is generated to model a non-uniform random unstable target,then a combined method of physic optics and equivalent current is employed to simulate the EM scattering in THz band. The scattering characteristics of the target with different roughness scales at different incident angles and radar frequencies are analyzed and discussed. Finally,the relevant conclusions are drawn.