Ultra-wideband signal generation and fusion algorithm for high-resolution terahertz FMCW radar imaging

Hu, Weidong; Xu, Zhihao; Han, Zhongde; Jiang, Huanyu; Liu, Yang; Lu, Yiji; Ligthart, L.P.

doi:10.1364/oe.450985

Cited by 9 publications

(4 citation statements)

References 29 publications

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“…In [35], an adaptive sub-aperture integration technique for wide angle SAR in THz applications was proposed for improved imaging and [27], 3D SAR was demonstrated at 1.5THz for enhanced image quality relative to the 0.85THz -1.1THz frequency band. Spiral SAR was explored in [2] and a UWB THz FMCW generation technique and UWB signal fusion algorithm was proposed for high range resolution and suitable for multilayer systems [11].…”

Section: B Related Workmentioning

confidence: 99%

“…Recently, the THz imaging technology has demonstrated salient potential and has become a research hotspot in various applications spanning NDT, radar communication, personal screening, automotive, material characterization, security, object detection and healthcare monitoring. Moreover, its unique characteristics including non-ionizing, non-invasive, high sensitivity to polar molecules such as water and penetrability to dielectric materials play a crucial role in these applications [11]. As a result, the THz based imaging promises great potential as a versatile imaging tool commentary to Magnetic Resonance Imaging (MRI) and X-Ray imaging tools [12].…”

Section: Introductionmentioning

confidence: 99%

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Curved Synthetic Aperture Radar for Near-Field Terahertz Imaging

Gezimati

Singh

2023

IEEE Photonics J.

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High resolution imaging technique will play an essential role in the future smart imaging applications to provide potential solutions for accurate detection, monitoring and classification of the target. The potential of synthetic aperture radar (SAR) systems to acquire high resolution images has opened new frontiers and led to its exploration in new applications. The conventional microwave radar imaging suffers limited range resolution in the sub-millimeter wave range and optical imaging methods are constrained by the diffraction limit. In the terahertz (THz) regime of the spectrum, the SAR systems could be operated in all the weather, all the time and are capable of penetrating through clouds, smoke, dust etc. to achieve high resolution images beyond the diffraction limit. The curved SAR presents a SAR system created by circularly encircling the target scene. The Circular SAR and Spiral SAR which are based on a circular and cylindrical spiral scanning trajectory, respectively are the scanning methods used for curved SAR. In this paper, we have explored a new toolbox that enables the rapid development of near-field THz-SAR imaging systems and generation of large near-field THz imaging scenarios with the goal to support and facilitate data driven research such as deep learning in the THz community through synthetically generated SAR images as well as its potential for THz based high resolution and 2D/3D near-field imaging application. Initially, the potential advantages of THz-SAR over Microwave SAR and optical imaging methods are presented. Further, a frequency modulated continuous wave (FMCW) radar testbed is simulated in multi-input multi-output (MIMO) configuration for the target frequency band. Moreover, the circular and cylindrical SAR scanning methods are explored for near-field imaging of point targets to obtain 2D and 3D THz-SAR images, respectively. Also, the radar images are reconstructed using the Back Propagation and Polar Formatting Algorithms, focusing on short range applications like indoor environments. Finally, the SAR performance evaluation metrics are reported and a roadmap for future work is presented.

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Section: B Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Curved Synthetic Aperture Radar for Near-Field Terahertz Imaging

Gezimati

Singh

2023

IEEE Photonics J.

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“…In particular, with the rapid development of terahertz imaging [17] and terahertz remote sensing [18] in recent years, terahertz polarization state gradually attracted attention. It is generally believed that the polarization state of terahertz can reflect more information, and the accurate regulation of the change of the polarization state will make the terahertz related application technology have higher accuracy.…”

Section: Introductionmentioning

confidence: 99%

Reduction of polarization deviation effects in terahertz splitter

Wang¹,

Rong²

2023

Phys. Scr.

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Because the polarization state can reflect more information, the development of terahertz remote sensing and communication technology, there is an urgent need for polarization insensitive terahertz regulatory devices. In this paper, a linear terahertz depolarization splitter is designed based on the transfer matrix method, which combines the symmetric structure with the matched material to obtain a material combination with very little polarization deviation. Statistical results show that this design has excellent performance of 51.0586% transmittance and low polarization degree of 0.0016 for 2.5 ThZ wave at 45 degrees of oblique incidence. Moreover, it has excellent performance of little transmission deviation and phase shift in the range of 0–55 degrees of incident Angle.

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“…It plays a vital role in standoff personnel screening [1][2][3], radar communication [4], biomedical imaging [5,6], materials characterization [7][8][9], new light field control [10,11], and non-destructive testing (NDT) [12,13], etc. In particular, the THz frequency modulated continuous-wave (THz FMCW) radar has a wide range of applications owing to its high power, miniaturization, high imaging rate, and three-dimensional (3D) imaging [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Image restoration algorithm for terahertz FMCW radar imaging

Jiang

et al. 2023

Appl. Opt.

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The terahertz frequency modulation continuous-wave (THz FMCW) imaging technology has been widely used in non-destructive testing applications. However, THz FMCW real-aperture radar usually has a small depth of field and poor lateral resolution, thus restricting the high-precision imaging application. This paper proposes a 150–220 GHz FMCW Bessel beam imaging system, effectively doubling the depth of field and unifying the lateral resolution compared to the Gaussian beam quasi-optical system. Moreover, a THz image restoration algorithm based on local gradients and convolution kernel priors is proposed to eliminate further the convolution effect introduced by the Bessel beam, thereby enhancing the lateral resolution to 2 mm. It effectively improves the image under-restoration or over-restoration caused by the mismatch between the ideal and actual point spread function. The imaging results of the resolution test target and semiconductor device verify the advantages of the proposed system and algorithm.

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Ultra-wideband signal generation and fusion algorithm for high-resolution terahertz FMCW radar imaging

Cited by 9 publications

References 29 publications

Curved Synthetic Aperture Radar for Near-Field Terahertz Imaging

Curved Synthetic Aperture Radar for Near-Field Terahertz Imaging

Reduction of polarization deviation effects in terahertz splitter

Image restoration algorithm for terahertz FMCW radar imaging

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