激光技术, 2016, 40 (5): 676, 网络出版: 2016-08-29
金属平板的太赫兹雷达散射截面测量
Measurement of terahertz radar cross sections of metal plates
测量与计量 雷达散射截面 太赫兹时域光谱系统 0.1 THz连续波测量系统 measurement and metrology radar cross section terahertz time-domain spectroscopy system 0.1THz continuous-wave measurement system
摘要
为了测量金属平板的雷达散射截面,分别采用了太赫兹时域光谱系统和0.1THz连续波测量系统两种方法进行测量, 并从理论上分析了雷达散射截面测量模型。结果表明, 对于太赫兹时域光谱系统, 随着测量频率和角度的增加, 其误差在增大; 对于0.1THz连续波测量系统, 随着角度的增加, 误差增大, 随着被测目标尺寸增大, 误差先减小后增大, 实验最小误差均可达到-0.244dB。利用太赫时域光谱系统及0.1THz连续波测量系统测量雷达散射截面均是可行的。太赫兹时域光谱系统具有频率取值范围大、角分辨率高的特点; 而0.1THz连续系统系统结构简单、成像速度快、使用方便。
Abstract
In order to measure radar cross sections (RCS) of metal plates, the RCSs were measured with a terahertz time-domain spectroscopy (THz-TDS) system and a 0.1THz continuous-wave measurement system respectively. RCS measurement modules were analyzed theoretically. The results show that measurement errors increase with the increase of measurement frequency and angles for a THz-TDS. For 0.1THz continuous-wave measurement system, errors increase with the increase of angles, and errors increase first and then decrease with the increase of the size of metal plates. The minimum error is -0.244dB. The results show that RCSs of metal plates can be obtained with both systems. Advantages of a THz-TDS are large frequency range and excellent angular resolution. Advantages of a 0.1THz continuous-wave measurement system are simpler structure, faster imaging speed and convenience.
聂雪莹, 项飞荻, 黄欣, 刘劲松, 杨振刚, 王可嘉. 金属平板的太赫兹雷达散射截面测量[J]. 激光技术, 2016, 40(5): 676. NIE Xueying, XIANG Feidi, HUANG Xin, LIU Jinsong, YANG Zhengang, WANG Kejia. Measurement of terahertz radar cross sections of metal plates[J]. Laser Technology, 2016, 40(5): 676.