Mr. Yining Wang Profile

Yining Wang

at Space Engineering Univ

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Proceedings Article | 18 November 2022 Paper

Research on the principle of synthetic aperture vortex beam imaging

Yining Wang, Yuan Ren, Linlin Chen, Liyuan Xu

Proceedings Volume 12473, 124730D (2022) https://doi.org/10.1117/12.2653553

KEYWORDS: Image resolution, LIDAR, Synthetic aperture radar, Radar imaging

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Synthetic aperture lidar is an optical remote sensing method that can theoretically achieve centimeter-level imaging resolution. It faces unprecedented research problems in physical optics, one of which is the single beam modulation mode, which greatly limits its large-scale application. A vortex beam carrying orbital angular momentum can theoretically generate an infinite variety of mutually orthogonal modulation modes. Applying it to imaging detection has the potential to bring richer information freedom while ensuring imaging resolution. In this paper, a vortex beam imaging model based on synthetic aperture method is proposed by combining vortex beam and synthetic aperture technology. Based on the basic principle of synthetic aperture and the theory of vortex beam orbital angular momentum, a synthetic aperture vortex beam imaging radar model is established. The data acquisition process of synthetic aperture vortex beam imaging is also deduced, and the phase angle position relationship in the echo data is analyzed. Finally, the range resolution and azimuth resolution of synthetic aperture vortex beam imaging under specific conditions are solved. Theoretical analysis shows that the rate of change of the topological charge of the vortex beam during the imaging process will have a great impact on the azimuthal resolution, which is consistent with the expected results. This paper lays a foundation for the follow-up research on vortex beam synthetic aperture imaging, and also provides a reference for the development of new radar technology.

Proceedings Article | 27 March 2022 Paper

Two-dimensional imaging method based on orbital angular momentum of optical vortex

Liyuan Xu, Linlin Chen, Yuan Ren, Zhengliang Liu, Tong Liu, Yining Wang

Proceedings Volume 12169, 121692X (2022) https://doi.org/10.1117/12.2623368

KEYWORDS: Optical vortices, Radar imaging, Bessel functions, Electromagnetism, Imaging systems, Radar

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Vortex beam is a new structured light field with a spiral wavefront. Because of carrying orbital angular momentum (OAM) information, vortex beam has a higher degree of freedom of information modulation than traditional laser. It has great application potential in inertial measurement and radar imaging fields. In this paper, we firstly propose a method for two-dimensional imaging based on orbital angular momentum of vortex. Firstly, an imaging model of vortex is established based on linear frequency modulation signal. In the distance direction, pulse compression is achieved by dechirping (The target signal light and the local oscillation light are heterodyne mixed, and amplitude and phase information are obtained by detector).In the azimuth direction, vortex beams carrying different orbital angular momentum l (i.e. topological charge) are emitted, and the target azimuth information represented in frequency domain is obtained by Fourier transform using the approximate duality between the orbital angular momentum spectrum and azimuth variable. The simulation results show that this method can distinguish the point target well and isolate the noise to a certain extent, which lays a foundation for the application of optics vortex in radar target imaging.

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