金属平板的太赫兹雷达散射截面测量

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0.1 THz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0.1 THz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0.1 THz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0.1 THz连续系统系统结构简单、成像速度快、使用方便。

Measurement of terahertz radar cross sections of metal plates

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 .