A third-order harmonic radar design for mm-wave frequencies
A third-order harmonic radar design for mm-wave frequencies
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毫米波频率的三阶谐波雷达设计
DOI：
10.1117/12.2586111
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Li, Changzhi
中科院分区：
文献类型：
--
作者：
Mishra, Ashish;Li, Changzhi
电子器件（如二极管和晶体管）的非线性特性会产生非线性响应，如谐波和互调，以抑制杂波。自然出现的杂波对象通常是线性的，或者它们具有非常小的非线性。它们可以通过利用非线性响应与含有上述非线性装置的人造目标区分开。本文利用这种非线性特性产生三阶谐波响应以抑制杂波。现有的非线性雷达通常利用二阶谐波响应来抑制杂波，这是由于谐波响应中的高功率电平。然而，由于它们接近于基频，这些雷达需要具有陡峭滚降的庞大且昂贵的滤波器和双工器，以维持雷达的发射器和接收器部分的线性度。由于与2阶谐波响应相比，3阶谐波响应和基频在频谱中被广泛分离，因此可以实现基频与谐波响应之间的更好隔离。这导致对这些基于三阶谐波雷达的滤波器和双工器的宽松要求。除此之外，接收器和标签的尺寸也会减小，因为尺寸和频率成正比。在本文中，三阶谐波雷达和无源标签的设计和工作在毫米波频段，即，24/72千兆赫。实验验证了它们的杂波抑制能力。
The nonlinear properties of electronic devices, such as diodes and transistors, can generate nonlinear responses such as harmonic and intermodulation for clutter rejection purposes. The naturally occurring clutter objects are generally linear, or they possess very small nonlinearity. They can be distinguished from man-made targets containing the above-mentioned nonlinear devices by exploiting nonlinear responses. In this paper, this nonlinear property was utilized for generating a 3 rd -order harmonic response for clutter rejection purposes. Existing nonlinear radars generally exploit 2 nd -order harmonic responses for clutter rejection purposes owing to their high power levels among the harmonic responses. However, due to their proximity to the fundamental tone, these radars require bulky and expensive filters and diplexers with steep roll-off for maintaining the linearity of the transmitter and receiver section of the radar. As the 3rd -order harmonic response and the fundamental tone are widely separated in the frequency spectrum compared to the 2nd order harmonic response, better isolation between the fundamental and harmonic response can be achieved. This results in relaxed requirements for filters and diplexers for these 3rd order based harmonic radars. Apart from that, the receiver and tag size would be reduced since size and frequency are inversely proportional. In this paper, the 3 rd -order harmonic radar and a passive tag were designed and operated in millimeterwave frequency bands, i.e., 24/72 GHz. Experimental validations were performed to prove their clutter rejection ability.
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