A Resolution-Improved Imaging Algorithm Based on Uniform Circular Array

Yuan, Hang; Chen, Yijun; Luo, Ying; Liang, Jiang; Wang, Zhihao

doi:10.1109/lawp.2021.3135806

Cited by 11 publications

(8 citation statements)

References 15 publications

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“…Then, according to the references [25][26][27], it can be seen that after performing dechirp processing on the above signal and performing fast Fourier transform on the fast time t k dimension, the above equation becomes…”

Section: Echo Model Of Variable-speed Moving Targets Under Non-quasi-...mentioning

confidence: 99%

Parameter Extraction of Accelerated Moving Targets under Non-Quasi-Axial Incidence Conditions Based on Vortex Electromagnetic Wave Radar

Zhang,

Zhu,

Chen

et al. 2024

Remote Sensing

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Vortex electromagnetic wave radar carrying orbital angular momentum can compensate for the deficiency of planar electromagnetic wave radar in detecting motion parameters perpendicular to the direction of electromagnetic wave propagation, thus providing more information for target recognition, which has become a hot research field in recent years. However, existing research makes it difficult to obtain the acceleration and rotation centers of targets under non-quasi-axial incidence conditions of vortex electromagnetic waves. Based on this, this article proposes a variable speed motion target parameter extraction method that combines single element and total element echoes. This method can achieve three-dimensional information extraction of radar targets based on a uniform circular array (UCA). Firstly, we establish a non-quasi-axis detection echo model for variable-speed moving targets and extract echoes from different array elements. Then, a single element echo is used to extract the target’s range slow time profile and obtain the target’s rotation center z coordinate. We further utilize the target linear, angular Doppler frequency shift extremum, and median information to extract parameters such as target acceleration, tilt angle, rotation radius, and rotation center x and y coordinates. We analyzed the impact of different signal-to-noise ratios and motion states on parameter extraction. The simulation results have verified the effectiveness of the proposed algorithm.

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Section: Echo Model Of Variable-speed Moving Targets Under Non-quasi-...mentioning

confidence: 99%

Parameter Extraction of Accelerated Moving Targets under Non-Quasi-Axial Incidence Conditions Based on Vortex Electromagnetic Wave Radar

Zhang,

Zhu,

Chen

et al. 2024

Remote Sensing

Self Cite

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show abstract

“…In the last ten years, a large number of research results have appeared regarding vortex EM wave imaging technology [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Ref.…”

Section: Introductionmentioning

confidence: 99%

“…Thereafter, Refs. [3][4][5][6][7][8][9] realized the high-resolution imaging of azimuth and reconstructed the two-dimensional imaging results of the target by using fast Fourier transform (FFT) or sparse Bayesian learning (SBL). Refs.…”

Section: Introductionmentioning

confidence: 99%

“…However, it has no ability to achieve three-dimensional imaging of radar target because of the correlation problem of scattering points. In summary, the above research [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] reconstructs the imaging of radar targets with the monostatic geometry by using UCA. The transmitter is usually set at the center of the UCA, and the receiver uses the UCA in this observation geometry, thus only two-dimensional imaging can be obtained with this monostatic configuration.…”

Section: Introductionmentioning

confidence: 99%

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Three-Dimensional Imaging with Bistatic Vortex Electromagnetic Wave Radar

et al. 2022

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The vortex electromagnetic wave radar based on monostatic geometry can realize the imaging of a radar target in both range dimension and azimuth dimension by adjusting vortex electromagnetic wave modes, but it has no ability to distinguish the elevation of the radar target. To achieve three-dimensional imaging of the radar target, a three-dimensional imaging method of vortex electromagnetic wave based on bistatic geometry is proposed. The echo model of the target based on vortex electromagnetic wave in bistatic geometry is constructed firstly. The elevation resolution of the target is realized, and then the three-dimensional coordinate of the target is reconstructed. Moreover, the elevation resolution and the computational complexity of the proposed method are also analyzed. Simulation results demonstrate the effectiveness of the proposed method. The results also illustrate that the array element requirements and the computational complexity of presented algorithm are less than Multiple Signal Classification (MUSIC) algorithm.

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“…For radar sensing, the vortex EM wave carrying OAM can be seen as multiple plane EM waves that simultaneously illuminate the target from continuous azimuth, achieving thus angular diversity without relative motion or beam scanning. Therefore, OAM-based schemes are regarded as a promising approach to provide the azimuthal resolution without relative motion [16]- [21]. In particular, when vortex EM waves illuminate spinning targets, the rotational Doppler shift caused by spinning targets is proportional to the spinning velocity and OAM mode [22].…”

Section: Introductionmentioning

confidence: 99%

Joint OAM Radar-Communication Systems: Target Recognition and Beam Optimization

Long¹,

Chen²,

Moretti³

et al. 2022

Preprint

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Orbital angular momentum (OAM) radars are able to estimate the azimuth angle and the rotation velocity of multiple targets without relative motion or beam scanning. Moreover, OAM wireless communications can achieve high spectral efficiency (SE) by utilizing a set of information-bearing modes on the same frequency channel. Benefitting from the above advantages, in this paper, we design a novel radar-centric joint OAM radar-communication (RadCom) scheme based on uniform circular arrays (UCAs), which modulates information signals on the existing OAM radar waveform. In details, we first propose an OAM-based three-dimensional (3-D) super-resolution position estimation and rotation velocity detection method, which can accurately estimate the 3-D position and rotation velocity of multiple targets. Then, we derive the posterior Cramér-Rao bound (PCRB) of the OAM-based estimates and, finally, we analyze the transmission rate of the integrated communication system. To achieve the best trade-off between imaging and communication, the transmitted integrated OAM beams are optimized by means of an exhaustive search method. Both mathematical analysis and simulation results show that the proposed radar-centric joint OAM RadCom scheme can accurately estimate the 3-D position and rotation velocity of multiple targets while ensuring the transmission rate of the communication receiver, which can be regarded as an effective supplement to existing joint RadCom schemes.

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A Resolution-Improved Imaging Algorithm Based on Uniform Circular Array

Cited by 11 publications

References 15 publications

Parameter Extraction of Accelerated Moving Targets under Non-Quasi-Axial Incidence Conditions Based on Vortex Electromagnetic Wave Radar

Parameter Extraction of Accelerated Moving Targets under Non-Quasi-Axial Incidence Conditions Based on Vortex Electromagnetic Wave Radar

Three-Dimensional Imaging with Bistatic Vortex Electromagnetic Wave Radar

Joint OAM Radar-Communication Systems: Target Recognition and Beam Optimization

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