A Fast 3D Near Range Imaging Algorithm for a Scanning Sparse MIMO Array in the Millimeter Band

Wang, Feifan; Deng, Bin; Yang, Qi; Wang, Hongqiang; Zhang, Ye

doi:10.3390/s20174701

Cited by 5 publications

(3 citation statements)

References 20 publications

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“…Millimeter-wave holographic imaging uses the basic principle of synthetic aperture radar (SAR) for reference. In order to meet the requirements of the security inspection imaging system, the focusing plane (imaging distance) of this paper is set as 3 m. The expression of azimuth resolution is related to the millimeter-wave wavelength, target distance and scanning aperture size [18], which is expressed as follows:…”

Section: Accurate Millimeter-wave Reconstruction Algorithm Based On Spherical Wave Expansionmentioning

confidence: 99%

Accurate Imaging of Wide Beam Active Millimeter Wave Based on Angular Spectrum Theory and Simulation Verification

2021

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Due to the fact that a millimeter-wave (MMW) has a strong ability to penetrate clothing, MMW holographic imaging technology can conduct a non-contact inspection of the human body’s surface. In recent years, personnel surveillance systems utilizing MMW holographic imaging technology has achieved rapid progress. However, limited by MMW holographic imaging’s image quality, the existing imaging technology cannot accurately detect whether the human body carries hidden objects. Additionally, real-time inspection requirements cannot be practically satisfied, and the system cost is relatively high. In this paper, a reconstruction algorithm with enhanced imaging quality, which can solve the problem of spherical wave attenuation with distance, making imaging results more accurate. The sampling conditions and imaging resolution are simulated and analyzed, which verify the azimuth resolution. Furthermore, the antenna beam’s holographic imaging simulation is optimized, effectively improving the quality of the reconstructed image. The proposed scheme provides theoretical support for determining antenna step and scanning aperture size in engineering and have theoretical guiding significance for improving the image quality of millimeter-wave holography and reducing system cost.

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Section: Accurate Millimeter-wave Reconstruction Algorithm Based On Spherical Wave Expansionmentioning

confidence: 99%

Accurate Imaging of Wide Beam Active Millimeter Wave Based on Angular Spectrum Theory and Simulation Verification

2021

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“…Special attention is paid to the development of optimal signal-processing methods and algorithms for MMW imaging. Recently, algorithms for fast fully focused imaging, which includes the case of location-constrained MIMO arrays or partially damaged transceivers, were proposed [ 18 , 19 ]. Methods for improving the resolution of the passive MMW images and making it more preferable for object recognition were suggested and studied [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Millimeter-Wave Imaging System Based on Direct-Conversion Focal-Plane Array Receiver

Korolyov

Goryunov

Illarionov

et al. 2022

Sensors

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A new approach to millimeter-wave imaging was suggested and experimentally studied. This approach can be considered as the evolution of the well-established focal-plane array (FPA) millimeter-wave imaging. The significant difference is the use of a direct-conversion array receiver, instead of the direct-detection array receiver, along with the frequency-modulated continuous-wave (FMCW) radar technique. The sensitivity of the direct-conversion receiver is several orders higher than the sensitivity of the direct-detection one, which allows us to increase the maximum imaging range by more than one order of magnitude. The additional advantage of the direct-conversion technique is the opportunity to obtain information about the range to an object. The realization of the direct-conversion FPA imaging system was made possible due to original sensitive simple-designed receiving elements based on low-barrier Mott diodes. The suggested imaging method’s main characteristics, which include the achievable angular and range resolution and the achievable maximum imaging range, were studied. A maximum range of up to 100 m was experimentally determined. A 94 GHz 8 × 8 imaging system was developed for demonstration purposes and studied in detail. The suggested technique is assumed to be useful for creating a long-range millimeter-wave camera, in particular, for robotic systems that operate in poor environmental conditions.

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“…An efficient interpolation-free algorithm (IFA) applied for cylindrical millimeter wave (MMW) holographic three-dimensional (3D) reconstruction has also been proposed [19], which can efficiently achieve high-quality 3D reconstruction within the region of interest (ROI). A series of array configurations were designed to explore the impact of different array positions on the cross-range imaging performance in [20], and a novel fast fully focused imaging algorithm with wavenumber domain properties that is not constrained by the positions of the transmitters and receivers was presented. However, there are some limitations in these works, such as limited system resolution and high costs.…”

Section: Introductionmentioning

confidence: 99%

A Range Resolution Enhancement Algorithm for Active Millimeter Wave Based on Phase Unwrapping Mechanism

2021

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Traditional security check technology is mainly based on metal detection by manual inspection. This method is simple and convenient, can detect a few different kinds of contrabands, and also takes into account the safety of inspectors. Because of its strong penetration characteristics, millimeter waves make up for the deficiency of existing security check technologies. Therefore, it is urgent to research and develop millimeter wave holographic imaging technology for human security inspection. In traditional imaging methods, the azimuthal resolution can be improved through various methods of image processing, but the traditional way to improve the range direction resolution is to increase the system bandwidth. However, improvements of the system bandwidth will greatly increase the cost. The bandwidth improvement space is also limited, so it cannot be expanded indefinitely in practical applications. In this study, the interferometric synthetic aperture theory was used to improve the range direction resolution of 3D millimeter wave holographic images without improving the system bandwidth. Phase unwrapping was used to reconstruct the phase information of complex images and restore the continuous phase distribution of the target object so as to achieve improvement of the range direction resolution without increasing the system bandwidth. This work has theoretical guiding significance to improve the range resolution of millimeter wave imaging.

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A Fast 3D Near Range Imaging Algorithm for a Scanning Sparse MIMO Array in the Millimeter Band

Cited by 5 publications

References 20 publications

Accurate Imaging of Wide Beam Active Millimeter Wave Based on Angular Spectrum Theory and Simulation Verification

Accurate Imaging of Wide Beam Active Millimeter Wave Based on Angular Spectrum Theory and Simulation Verification

Millimeter-Wave Imaging System Based on Direct-Conversion Focal-Plane Array Receiver

A Range Resolution Enhancement Algorithm for Active Millimeter Wave Based on Phase Unwrapping Mechanism

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