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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-0.244d B。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。
In order to measure the radar cross section of the metal slab, two methods of the THz time-domain spectroscopy system and the 0.1 THz continuous wave measurement system were respectively used for the measurement, and the radar cross section measurement model was theoretically analyzed. The results show that the error increases with the increase of measurement frequency and angle for the terahertz time-domain spectroscopy system. As the angle increases, the error increases with the measurement of target size Increase, the error decreases first and then increases, the experimental minimum error can reach -0.244d B. The use of terahertz time-domain spectroscopy system and 0.1THz continuous wave measurement system to measure the radar cross section are feasible. The terahertz time-domain spectroscopy system has the advantages of large frequency range and high angular resolution. The 0.1THz continuous system has the advantages of simple structure, fast imaging speed and convenient use.