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以研究太赫兹雷达散射截面的特性为目的,选用所搭建低频太赫兹雷达测试系统,并借助于标准目标法开展了有关太赫兹雷达粗糙铝盘散射截面的实验研究工作。实验结果表明:在小角度散射中太赫兹雷达散射截面随散射角的增大变化比较明显,在散射角超过5°后太赫兹雷达散射截面随散射角的变化趋向缓慢,但当散射角超过12°后探测信号的强度已衰减到无法测量,在太赫兹雷达散射截面的测试中没有出现微波雷达散射截面的大小随散射角的变化而剧烈振荡的现象;将测试结果与同尺寸微波、激光雷达散射截面的结果进行了对比,得到结论:在0°附近太赫兹雷达散射截面的数值比同尺寸微波雷达散射截面的数值要小两个数量级,但比同尺寸激光雷达散射截面的数值要高一个数量级。
In order to study the characteristics of the terahertz radar cross section, the test system of the low frequency terahertz radar is selected and the experimental research on the rough aluminum disk cross section of the terahertz radar is carried out by means of the standard target method. The experimental results show that the scattering cross section of terahertz radar changes more obviously with the increase of scattering angle in small-angle scattering. When the scattering angle exceeds 5 °, the variation of scattering cross-section of terahertz radar with scattering angle tends to be slow. However, when the scattering angle exceeds 12 ° after the detection signal intensity has decayed to unmeasurable, in the terahertz radar cross section of the test did not appear the size of the microwave radar cross section scattering angle changes with the phenomenon of severe oscillation; the test results and the same size microwave, lidar The results of the cross sections are compared and it is concluded that the value of the cross section of the terahertz radar at 0 ° is two orders of magnitude smaller than that of the same size microwave radar but higher than the value of the cross section of the same size lidar Magnitude.