太赫兹粗糙金属目标镜面雷达散射截面预估方法  

Estimation of specular radar cross section for metal object with rough surfaces in terahertz band

作　　者：逄爽 曾旸 杨琪 邓彬[1] 王宏强[1] PANG Shuang;ZENG Yang;YANG Qi;DENG Bin;WANG Hongqiang(College of Electronic Science and Technology, National University of Defense Technology, Changsha 410073, China;College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China)

机构地区：[1]国防科技大学电子科学学院,湖南长沙410073 [2]国防科技大学气象海洋学院,湖南长沙410073

出　　处：《国防科技大学学报》2022年第1期48-54,共7页Journal of National University of Defense Technology

基　　金：国家自然科学基金资助项目(61871386,61971427)。

摘　　要：在太赫兹频段,研究金属目标表面粗糙度对雷达散射截面(Radar Cross Section,RCS)的调制作用,对粗糙金属目标的RCS缩比测量具有重要意义。通过研究太赫兹粗糙金属目标镜面RCS随粗糙度的变化规律,结合相干、非相干散射理论,在基尔霍夫近似法的基础上,提出一种特定参数区间粗糙金属目标镜面RCS的预估方法,并对其预估效果进行仿真验证。该方法在太赫兹低频段小粗糙度范围内可以实现对粗糙金属目标镜面RCS的快速预估,并可进一步预测粗糙目标缩比模型的镜面RCS,为太赫兹粗糙金属目标RCS的缩比测量提供有效的比对数据,从而进一步为太赫兹粗糙目标的缩比关系研究提供理论支持。Research on the modulation of the surface roughness to the RCS(radar cross section)has vital importance to the RCS scaled measurement for rough metal targets in the terahertz band.The changing laws of specular RCS of rough metal target with different surface roughness were studied.Based on the method of Kirchhoff approximation,combined with the theory of coherent and incoherent scattering,the method for predicting the specular RCS of rough metal target was proposed under the condition of small surface roughness.The effectiveness of the prediction method was validated by simulation experiments.The proposed method can achieve fast estimation of specular RCS for metal target with small surface roughness in the low terahertz band,and further predict the specular RCS for the scaled model with rough surface.This method also can provide effective RCS value for the comparison with the measurement result,which theoretically supports the study of RCS scaled measurements for rough targets in the terahertz spectrum.

关 键 词：太赫兹 雷达散射截面 基尔霍夫近似 粗糙表面 金属目标 

分 类 号：TN95[电子电信—信号与信息处理]