Inverse synthetic aperture lidar imaging and compensation in slant atmospheric turbulence with phase gradient algorithm compensation

Xue, Jiyu; Cao, Yunhua; Wu, Zhensen; Li, Yanhui; Zhang, Geng; Kai, Yang; Gao, Ruoting

doi:10.1016/j.optlastec.2022.108329

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…It makes the Snr (signal-to-noise ratio) of micro-Doppler information decrease seriously. The double pulse laser [ 6 , 7 ] can emit higher energy under the condition that a single pulse has the same ranging ability, which is conducive to the detection of weak signals. Therefore, it is suitable for measuring the echo energy and intensity of a target.…”

Section: Introductionmentioning

confidence: 99%

Micro-motion characteristics of multi-feature targets on the double pulse coherent system

Chen,

Zhang,

Wang

et al. 2024

Heliyon

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Section: Introductionmentioning

confidence: 99%

Micro-motion characteristics of multi-feature targets on the double pulse coherent system

Chen,

Zhang,

Wang

et al. 2024

Heliyon

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“…Over the past decade, most previous simulation and experiment works on ISAL and SAL imaging in atmospheric turbulence have been demonstrated [4][5][6][7][8][9][10][11]. In 2014, the performance characterization of phase gradient autofocus for ISAL was studied by CJ Pellizzari [12], who showed that the phase gradient algorithm (PGA) can still maintain its advantage of automatic focusing under atmospheric turbulence and low signal-to-noise ratio (SNR) conditions.…”

Section: Introductionmentioning

confidence: 99%

“…In 2022, Ming Liu studied the imaging performance and anti-interference ability of an SAL with photonic lantern coupling under atmospheric turbulence [16]. At the same time, Jiyu Xue employed the PGA algorithm to study the ISAL imaging of rough targets in slant atmospheric turbulence through the use of an atmospheric random phase screen [11]. It was found that ISAL images with rough targets could be resolved not only under under weak turbulence but strong turbulence.…”

Section: Introductionmentioning

confidence: 99%

Effects of Atmospheric Coherent Time on Inverse Synthetic Aperture Ladar Imaging through Atmospheric Turbulence

et al. 2023

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Inverse synthetic aperture ladar (ISAL) can achieve high-resolution images for long-range moving targets, while its performance is affected by atmospheric turbulence. In this paper, the dynamic evolution of atmospheric turbulence is studied by using an infinitely long phase screen (ILPS), and the atmospheric coherent time is defined to describe the variation speed of the phase fluctuation induced by atmospheric turbulence. The simulation results show that the temporal decoherence of the echo induced by turbulence causes phase fluctuation and introduces an extra random phase, which deteriorates the phase stability and makes coherent synthesis impossible. Thus, we evaluated its effects on ISAL imaging and found a method to mitigate the impact of turbulence on ISAL images. The phase compensation algorithm could correct the phase variation in different pulses instead of that within the same pulse. Therefore, the relationship between the atmospheric coherent time and pulse duration time (rather than that between the atmospheric coherent time and ISAL imaging time) ultimately determines the ISAL imaging quality. Furthermore, these adverse effects could be mitigated by increasing the atmospheric coherent time or decreasing the pulse duration time, which results in an improvement in the ISAL imaging quality.

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Modified compressible turbulence phase distortion formula and compressible turbulence spectrum simulation

Xue,

Wu,

Cui

et al. 2024

Physics of Fluids

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In order to better study the imaging characteristics of high-speed moving targets in atmospheric turbulence, it is necessary to solve the optical distortion caused by aerodynamic optical effects, and the optical distortion needs to be described by compressible turbulence spectrum. In order to better understand the spectral characteristics of aero-optical distortion, according to the Maxwell equation, the Boltzmann factor equation is introduced based on the existing compressible turbulence spectrum theory, and the analytical expression of the modified compressible turbulence spectrum is derived and verified. Then, based on the freezing theory, the compressible turbulence spectrum is simulated by the phase screen method of power spectrum inversion. The influence of the distance from the moving target wall and turbulence intensity on the compressible turbulence phase screen is simulated and analyzed. Compared with atmospheric turbulence, it is found that the intensity of turbulence is proportional to the compressible turbulence, but the compressible turbulence is also inversely proportional to the distance of the moving target wall. As the distance from the moving target wall decreases, the phase fluctuation of the compressible turbulence is larger, which also indicates that the aero-optical effect mainly occurs in the boundary layer annex of the moving target, and the nearer the target, the aero-optical effect becomes more serious.

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Inverse synthetic aperture lidar imaging and compensation in slant atmospheric turbulence with phase gradient algorithm compensation

Cited by 4 publications

References 5 publications

Micro-motion characteristics of multi-feature targets on the double pulse coherent system

Micro-motion characteristics of multi-feature targets on the double pulse coherent system

Effects of Atmospheric Coherent Time on Inverse Synthetic Aperture Ladar Imaging through Atmospheric Turbulence

Modified compressible turbulence phase distortion formula and compressible turbulence spectrum simulation

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