A 250GHz Autodyne FMCW Radar in 55nm BiCMOS with Micrometer Range Resolution
A 250GHz Autodyne FMCW Radar in 55nm BiCMOS with Micrometer Range Resolution
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采用 55nm BiCMOS 的 250GHz Autodyne FMCW 雷达，具有微米级分辨率
DOI：
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发表时间：
2021
期刊：
影响因子：
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通讯作者：
E. Afshari
中科院分区：
文献类型：
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作者：
S. Naghavi;Saghar Seyedabbaszadehesfahlani;F. Khoeini;A. Cathelin;E. Afshari
由于更短的波长和更大的可用带宽，对紧凑、低成本和高分辨率雷达系统日益增长的需求将工作频率推向了太赫兹范围[1-5]。然而，在100GHz带宽下，最佳范围分辨率不能低于1.5mm，这对于小缺陷检测和表面筛选等许多工业应用来说是不够的。此外，大多数先前的工作[3-5]都是基于传统的收发器架构，这些架构为TX和RX使用单独的天线，或者使用并行多天线设计来增加频率带宽[1]。这些结构不仅增加了芯片的尺寸，而且当它们被放置在准直透镜的焦点时，会降低雷达的性能。这种退化是由于分离的天线相位中心没有很好地定位在准直透镜的焦点上，导致多波束辐射方向图。为了克服这些挑战，我们采用了一种对雷达中频信号[7]进行相位处理的自达因FMCW雷达结构[6,7]。自激器是一种振荡器，它同时执行产生发射信号和混合发射和反射信号的功能。由于辐射信号和反射信号存在于自达因电路的同一点，因此RX信号在自达因中没有单独的路径。因此，它利用具有单相中心的组合天线用于发射和接收部分。此外，相位处理方法允许我们测量短距离，误差不超过百分之一的十分之一，在太赫兹频率下提供微米级的分辨率。利用这些方法，本文演示了一种带宽为66.7GHz的自达因FMCW雷达，带宽范围为191GHz至257.7GHz，最小距离分辨率为54 μ m{m}。通过最先进的技术，这种设计将距离分辨率提高了28倍。
The increasing demands for compact, low-cost, and high-resolution radar systems have pushed the operation frequency to the terahertz range due to the shorter wavelength and larger available bandwidth [1–5]. However, the best-reported range resolution cannot go below 1.5mm with a 100GHz bandwidth [1], which is not enough for many industrial applications like small-defect detection and surface screening. Moreover, most previous works [3–5] are based on conventional transceiver architectures that use separate antennas for TX and RX or use parallel multi-antenna designs to increase the frequency bandwidth [1]. These structures not only increase the chip size but also degrade the radar performance when they are placed at the focal point of a collimating lens. This degradation occurs due to the separated antenna phase centers, which are not well located at the collimating lens focal point, causing a multi-beam radiation pattern. To overcome these challenges, we have adopted an autodyne FMCW radar structure [6, 7] with a phase processing method on the radar IF signal [7]. The autodyne is an oscillator that simultaneously carries out functions of generating the transmission and mixing the transmitted and reflected signals. There is no separate path for the RX signal in the autodyne, as the radiated and reflected signals exist at the same point of the autodyne circuit. Hence, it utilizes a combined antenna with a single-phase center for both transmitting and receiving parts. Besides, the phase processing method allows us to measure short ranges with an error no more than one-tenth of one-percent, which in terahertz frequencies provides micrometer resolutions [7]. Using these approaches, this paper demonstrates an autodyne FMCW radar with 66.7GHz bandwidth from 191GHz to 257.7GHz with a minimum range resolution of $54 mu mathrm{m}$. Across state-of-the-art, this design improves the range resolution by 28 times.
DOI：
10.1109/tthz.2016.2602539
发表时间：
2016-11-01
影响因子：
3.2
作者：
Grzyb, Janusz;Statnikov, Konstantin;Pfeiffer, Ullrich R.
通讯作者：
Pfeiffer, Ullrich R.