Reduction of Scattering Clutters in an Underwater Lidar System by Using an Optical Vortex

Liao, Yingqi; Yang, Suhui; Li, Kun; Ji, Junwen; Lin, Xuetong; Huang, Yuancan; Li, Zhuo; Wang, Xin; Zhang, Jinying

doi:10.1109/lpt.2022.3193307

Cited by 7 publications

(2 citation statements)

References 25 publications

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“…Echo beams with coherence (signal light) can be modulated into vortex beams, while echo beams lacking coherence (multi-scattered light, background light) remain unmodulated, retaining Gaussian geometrical distribution. 6,7 By employing specifically designed annular apertures, optical noise can be filtered out, retaining the signal light and enhancing the SNR of detection.…”

Section: Introductionmentioning

confidence: 99%

A method to enhance the detection capability of optical sensing based on the quantum characteristics of vortex beam

Li,

Zhang,

et al. 2023

Quantum and Nonlinear Optics X

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We propose a method based on vortex beams, which carries optical orbital angular momentum (OAM) to achieve spatial separation of coherent signal light and incoherent noise light and conducted experiments to evaluate the effect. Based on the experimental results, we established the relationship between signal-to-noise ratio (SNR) and topological charge number, signal channel size, and then optimized the relevant parameters. We built a LIDAR system for underwater detection to verify the practical effectiveness of the method. The experimental results demonstrate a significant improvement in the SNR for underwater detection.

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Section: Introductionmentioning

confidence: 99%

A method to enhance the detection capability of optical sensing based on the quantum characteristics of vortex beam

Li,

Zhang,

et al. 2023

Quantum and Nonlinear Optics X

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show abstract

“…B. Tang found that OAMs can carry more information than plane waves when passing through the chaff clouds [24]. Y. Liao found that using vortex beam detection can reduce the effects of clutter [25]. By using the OAM radar, C. Zhang realized that the vortex beam improves the receiving signal-to-noise ratio (SNR) of stealth targets [26,27].…”

Section: Introductionmentioning

confidence: 99%

Classification of Plates and Trihedral Corner Reflectors Based on Linear Wavefront Phase-Modulated Beam

et al. 2022

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Wavefront-modulated beams such as vortex beams have attracted much attention in the field of target recognition due to the introduced degrees of freedom. However, traditional wavefront-modulated beams are doughnut shaped, and are not suitable for radar detection or tracking. To solve this problem, a linear wavefront phase-modulated beam with a maximum radiation intensity in the center was proposed in a previous study. In this paper, we continue to study target characteristics under the linear wavefront phase-modulated beam. Through analysis of the target scattering based on the physical optics (PO) method, we find that a part of the monostatic or bistatic radar cross-section (RCS) of the target could be obtained by changing the phase gradient of the modulated beam. Taking this part of RCS for feature extraction, we recognize the plates and trihedral corner reflectors through the support vector machine (SVM) method. For data visualization, we use the t-distributed stochastic neighbor embedding (t-SNE) method for data dimensionality reduction. The results show that the recognition probability of the plates and trihedral corner reflectors can reach 91% with an antenna array having an aperture of 20 wavelengths when the signal-to-noise ratio (SNR) is 20 dB, while the traditional plane beam cannot classify these two targets directly.

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Numerical simulations on the enhancement of the signal-to-noise ratio by using a vector vortex beam with polarization modulation in LIDAR applications

Wei,

Zhou,

et al. 2024

Optics & Laser Technology

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Reduction of Scattering Clutters in an Underwater Lidar System by Using an Optical Vortex

Cited by 7 publications

References 25 publications

A method to enhance the detection capability of optical sensing based on the quantum characteristics of vortex beam

A method to enhance the detection capability of optical sensing based on the quantum characteristics of vortex beam

Classification of Plates and Trihedral Corner Reflectors Based on Linear Wavefront Phase-Modulated Beam

Numerical simulations on the enhancement of the signal-to-noise ratio by using a vector vortex beam with polarization modulation in LIDAR applications

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