340-GHz 3-D Imaging Radar With 4Tx-16Rx MIMO Array

Cheng, Baolei; Cui, Zhenmao; Lü, Bin; Qin, Yuliang; Liu, Qiao; Chen, Peng; He, Yuan; Jiang, Jun; He, Xiaoyong; Deng, X. H.; Zhang, Jian; Zhu, Li-Guo

doi:10.1109/tthz.2018.2853551

Cited by 83 publications

(26 citation statements)

References 7 publications

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“…Digital Object Identifier 10.1109/TMTT.2020.3022938 Recently, numerous millimeter-wave frequency-modulated continuous-wave (FMCW) imaging radars above 100 GHz have been published [11]- [15], see Table I. Table I is sorted by increasing virtual aperture size A V , and thus increasing angular resolution capabilities (ϑ: azimuth and ϒ: elevation).…”

Section: Introductionmentioning

confidence: 99%

“…Various SAR focusing and correction methods have been presented [17]- [19]. The back-projection and range migration algorithm are two prevalent methods for image reconstruction and are used in [14] and [15]. However, the high computational complexity of these algorithms is disadvantageous and makes them unsuitable for low-cost radar applications [19].…”

Section: Introductionmentioning

confidence: 99%

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Range-Angle Coupling and Near-Field Effects of Very Large Arrays in mm-Wave Imaging Radars

Dürr¹,

Schneele²,

Schwarz³

et al. 2021

IEEE Trans. Microwave Theory Techn.

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In order to improve the resolution of imaging radars, electrically large arrays and a high absolute modulation bandwidth are needed. For radar systems with simultaneously high range resolution and very large aperture, the difference in path length at the receiving antennas is a multiple of the range resolution of the radar, in particular for off-boresight angles of the incident wave. Therefore, the radar response of a target measured at the different receiving antennas is distributed over a large number of range cells. This behavior depends on the unknown incident angle of the wave and is, thus, denoted as range-angle coupling. Furthermore, the far-field (FF) condition is no longer fulfilled in short-range applications. Applying conventional signal processing and radar calibration techniques leads to a significant reduction of the resolution capabilities of the array. In this article, the key aspects of radar imaging are discussed when radars with both large aperture size and high absolute bandwidth are employed in short-range applications. Based on an initial mathematical formulation of the physical effects, a correction method and an efficient signal processing chain are proposed, which compensate for errors that occur with conventional beamforming techniques. It is shown by measurements that with an appropriate error correction an improvement of the angular resolution up to a factor of 2.5 is achieved, resulting in an angular resolution below 0.4 • with an overall aperture size of nearly 200 λ 0 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Range-Angle Coupling and Near-Field Effects of Very Large Arrays in mm-Wave Imaging Radars

Dürr¹,

Schneele²,

Schwarz³

et al. 2021

IEEE Trans. Microwave Theory Techn.

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show abstract

“…I N THE past few decades, millimeter and terahertz (THz) waves have been found very useful in applications such as imaging [1]- [3], high-speed communication [4], [5], remote sensing [6], and spectroscopy [7], [8]. At this frequency band, air-filled waveguide is widely adopted as the basic building block for a wide range of devices.…”

Section: Introductionmentioning

confidence: 99%

A 135–150-GHz Frequency Tripler Using SU-8 Micromachined WR-5 Waveguides

Guo

Huggard

Dhayalan

et al. 2020

IEEE Trans. Microwave Theory Techn.

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This article presents a 135-150-GHz Schottky diode-based bias-less frequency tripler based on SU-8 micromachined WR-5 waveguides. The waveguides consist of five 432-µmthick silver-plated SU-8 layers, which house the diode chip and form the output matching network. The input matching circuit is realized in a computer numerical control (CNC) milled waveguide filter, which also provides support and thermal sink to the SU-8 waveguides. Considering the low thermal conductivity of the SU-8 material, auxiliary metallic thermal paths are designed, and the impact of these is discussed through thermal modeling. The thermal simulations show that under 50-mW power dissipation in the diode anodes, the maximum temperature of the SU-8 tripler is predicted to be 346 K at the diode junction, only 7 K higher than in an entirely metal equivalent. The tripler was measured to have a conversion loss of 16-18 dB and the input return loss is better than 18 dB. This work demonstrates that SU-8 micromachined waveguides can be used to package high-frequency semiconductor components, which, like other photolithography-based processes such as silicon deep reactive ion etching (Si-DRIE), has the potential for submicrometer feature resolution.

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“…Compared to the raster-scanning radar system, the mixed-scanning radar system substitutes one-dimensional (1-D) raster scanning with 1-D electrical scanning or 1-D mechanical scanning, and the imaging speed can be greatly improved. Representatives of mixed-scanning radar systems include Chinese Academy of Sciences [20][21][22] and China Academy of Engineering Physics [23,24]. The mixed-scanning radar system can achieve 3-D imaging near real time, but some defects still exist (e.g., the imaging field of view is limited, and the target needs to be stationary).…”

Section: Introductionmentioning

confidence: 99%

Estimation of Translational Motion Parameters in Terahertz Interferometric Inverse Synthetic Aperture Radar (InISAR) Imaging Based on a Strong Scattering Centers Fusion Technique

et al. 2019

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Translational motion of a target will lead to image misregistration in interferometric inverse synthetic aperture radar (InISAR) imaging. In this paper, a strong scattering centers fusion (SSCF) technique is proposed to estimate translational motion parameters of a maneuvering target. Compared to past InISAR image registration methods, the SSCF technique is advantageous in its high computing efficiency, excellent antinoise performance, high registration precision, and simple system structure. With a one-input three-output terahertz InISAR system, translational motion parameters in both the azimuth and height direction are precisely estimated. Firstly, the motion measurement curves are extracted from the spatial spectrums of mutually independent strong scattering centers, which avoids the unfavorable influences of noise and the “angle scintillation” phenomenon. Then, the translational motion parameters are obtained by fitting the motion measurement curves with phase unwrapping and intensity-weighted fusion processing. Finally, ISAR images are registered precisely by compensating the estimated translational motion parameters, and high-quality InISAR imaging results are achieved. Both simulation and experimental results are used to verify the validity of the proposed method.

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340-GHz 3-D Imaging Radar With 4Tx-16Rx MIMO Array

Cited by 83 publications

References 7 publications

Range-Angle Coupling and Near-Field Effects of Very Large Arrays in mm-Wave Imaging Radars

Range-Angle Coupling and Near-Field Effects of Very Large Arrays in mm-Wave Imaging Radars

A 135–150-GHz Frequency Tripler Using SU-8 Micromachined WR-5 Waveguides

Estimation of Translational Motion Parameters in Terahertz Interferometric Inverse Synthetic Aperture Radar (InISAR) Imaging Based on a Strong Scattering Centers Fusion Technique

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