低频太赫兹准目标雷达散射截面的实验研究

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.

Experimental study on the radar cross section of low-frequency terahertz standard target

For study the characteristics of terahertz radar scattering cross section, by building a low-frequency terahertz radar test system, and with the help of standard target method, experiments and research work about terahertz radar scattering cross section of rough aluminum plate were carried out. The experimental results show that: In the small angle scattering, terahertz radar scattering cross section changes much obviously with the increase of the scattering angle; But when the scattering angle is more than 5, terahertz radar scattering cross section varies with the scattering angle tends to be slow; And when the scattering angle is more than 12, the detection signal strength attenuation cannot be measured. The phenomenon that microwave radar scattering cross section size changes with the angle of scattering while acuteness oscillation does not appear in the testing of terahertz radar scattering cross section. Comparison of the test results with the same size of microwave and laser radar cross section, it can be the concluded:In the vicinity of 0, the magnitude of terahertz radar scattering cross section is two orders lower than the same size microwave radar scattering cross section, but is an order higher than the same size laser radar scattering cross section.