Beam Steering for Electromagnetic Vortex Imaging Using Uniform Circular Arrays

Yuan, Tiezhu; Cheng, Yongqiang; Wang, Hongqiang; Qin, Yuliang

doi:10.1109/lawp.2016.2600404

Cited by 57 publications

(35 citation statements)

References 6 publications

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“…Due to the existence of the Rayleigh limit, traditional radar imaging algorithms can only provide limited azimuth resolution. Some efficient algorithms have been proposed for OAM-based super-resolution radar imaging, such as UCAA-based autoregressive models and power spectral density (PSD) estimation algorithm [187], UCAA-based echo models and multiple signal classification (MUSIC) algorithm [188], [189], estimating signal parameter via rotational invariance techniques (ESPRIT) algorithm [190] and least squares algorithms [191], [192].…”

Section: B Optical and Radar Imagingmentioning

confidence: 99%

“…The difference of echo intensity will lead to amplitude modulation of the echo signal, resulting in a deterioration of the imaging capability. These effects can be mitigated by carefully designing the radius and excitation of the UCAA to adjust the main lobes of the vortex electromagnetic waves with different modes [183], [187], [191]. In addition, detecting dynamic targets is also challenging, which requires more in-depth research.…”

Section: B Optical and Radar Imagingmentioning

confidence: 99%

See 1 more Smart Citation

Orbital Angular Momentum Waves: Generation, Detection, and Emerging Applications

Chen

Zhou

Moretti

et al. 2020

IEEE Commun. Surv. Tutorials

267

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Orbital angular momentum (OAM) has aroused a widespread interest in many fields, especially in telecommunications due to its potential for unleashing new capacity in the severely congested spectrum of commercial communication systems. Beams carrying OAM have a helical phase front and a field strength with a singularity along the axial center, which can be used for information transmission, imaging and particle manipulation. The number of orthogonal OAM modes in a single beam is theoretically infinite and each mode is an element of a complete orthogonal basis that can be employed for multiplexing different signals, thus greatly improving the spectrum efficiency. In this paper, we comprehensively summarize and compare the methods for generation and detection of optical OAM, radio OAM and acoustic OAM. Then, we represent the applications and technical challenges of OAM in communications, including free-space optical communications, optical fiber communications, radio communications and acoustic communications. To complete our survey, we also discuss the state of art of particle manipulation and target imaging with OAM beams.

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Section: B Optical and Radar Imagingmentioning

confidence: 99%

Section: B Optical and Radar Imagingmentioning

confidence: 99%

Orbital Angular Momentum Waves: Generation, Detection, and Emerging Applications

Chen

Zhou

Moretti

et al. 2020

IEEE Commun. Surv. Tutorials

267

View full text Add to dashboard Cite

show abstract

“…In Reference , the concentric circular array antenna (CCAA) with 10 rings are used to generate multimode OAM beams with uniform main lobe azimuth by controlling the amplitude distribution, but the size of the antenna is quite large. Yuan et al offered another way for azimuth uniformity by means of phased array. However, the SLL of the array with only one ring is up to −3.6 dB.…”

Section: Introductionmentioning

confidence: 99%

Pattern synthesis of the multimode orbital angular momentum beams based on the fruit fly optimization algorithm

Zhu

et al. 2019

Int J RF Microw Comput Aided Eng

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The multimode orbital angular momentum (OAM) radio waves can be used to multiplex multiple transmission channels to increase the capacity of communication system without adding additional bandwidth. However, the divergence of the OAM beams and beam inconsistency escalate by increasing OAM mode number. Moreover, the worse sidelobe level (SLL) always appears along with a better convergent beam. In this article, the fruit fly optimization algorithm (FOA) is proposed to suppress the SLL in multimode OAM scenario. Based on the concentric circular array antenna (CCAA), the feeding amplitudes and the radii of the array are synthesized simultaneously to realize less than −30 dB SLL of the multimode OAM patterns. When the main lobes with different OAM modes steered to a uniform azimuth of θ = 0°, the SLLs of these OAM modes are also suppressed to less than −21 dB. The advantages of FOA used in the OAM pattern synthesis are verified by comparing it with the genetic algorithm (GA). The FOA‐based synthesis has a simpler implementation flow diagram which reduces the time of synthesis to 39.5% of GA.

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“…Several concentric circular arrays are employed to adjust the directivity of the main-lobe and reduce the high side-lobe levels. A beam steering method is proposed in [17] with UCA, and 2-D target imaging is achieved by an l p regularized least-squares algorithm. In [18], two targets in the same range gate are tracked, and the azimuth and elevation angles are obtained by using three different topological charges.…”

Section: Introductionmentioning

confidence: 99%

A Novel Image Formation Method for Electromagnetic Vortex Sar With Orbital-Angular-Momentum

Fang¹,

Jie²,

Wang³

et al. 2019

PIER M

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Electromagnetic (EM) vortex wave carrying orbital angular momentum (OAM) has attracted a lot of attention in radar imaging, due to its potential capability of new degree of freedom for information modulation. Most existing OAM-based radar imaging methods require abundant OAM modes to realize the azimuth resolution. Switching between the OAM modes frequently increases the burden of radar antenna and the complexity of beam steering. In this paper, a novel electromagnetic vortex synthetic aperture radar (EMV-SAR) model with equivalent squint imaging is established. The geometrical model and echo signal model are derived correspondingly. By analyzing the echo signal model, amplitude and phase modulation introduced by the OAM affect the azimuth focusing, and traditional imaging algorithms are no longer applicable. Hence, a novel image formation method based on the traditional Chirp-Scaling (CS) algorithm is proposed for the EMV-SAR. The amplitude weighting function and phase modulation function are derived accurately, and high-precision focusing processing is achieved by modified CS algorithm. Point targets simulation results validate that the image focusing performance can be improved significantly using the proposed algorithm.

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Beam Steering for Electromagnetic Vortex Imaging Using Uniform Circular Arrays

Cited by 57 publications

References 6 publications

Orbital Angular Momentum Waves: Generation, Detection, and Emerging Applications

Orbital Angular Momentum Waves: Generation, Detection, and Emerging Applications

Pattern synthesis of the multimode orbital angular momentum beams based on the fruit fly optimization algorithm

A Novel Image Formation Method for Electromagnetic Vortex Sar With Orbital-Angular-Momentum

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