A New Identification Method Aimed at Optical Targets Using an Active Interference Laser Beam

Zhao, Yaqi; Sun, Hua Yan; Shan, Cong Miao; Zheng, Yong; Zhang, Lai Xian

doi:10.1109/lpt.2014.2312382

Cited by 7 publications

(3 citation statements)

References 16 publications

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“…Equation (2) gives the relationship between the attitude deflection angle of the optical target and the time distribution of the reflected light. As known from the complex expression of Equation (1), it is very difficult to directly write the analytical expressions denoting the time distribution of the reflected light intensity and the deflection angle.…”

Section: Simulation and Analyzationmentioning

confidence: 99%

A new recognition method aimed at optical reconnaissance attitude based on laser active interference

Shan

Lao

et al. 2023

AOPC 2022: Optical Sensing, Imaging, and Display Technology

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The optical target reconnaissance attitude, that is, the optical axis pointing of photographic or detection equipment, is an important parameter for active laser detection systems. A new recognition method aimed at optical target reconnaissance attitude based on active coherent laser beams is presented. Using the cat's eye effect of reflected light from active coherent beams scanning through an optical target along two orthogonal directions, optical target reconnaissance attitude can be calculated by measuring the edge peak amplitude ratio of the two reflected light time distribution envelopes. The usability of this method is validated through theoretical analysis and experiment. The results show that the theoretical minimum relative error of the recognition method is <1%. The greater the deflection angle is, the smaller the mean of the relative error, the required fringe spacing for the minimum relative error are and the smaller influence of detection distance on relative error, therefore the more accurate the estimation will be. This method can improve the parameter identification ability of existing active laser detection and recognition systems, and it has important practical significance in judging the area of reconnaissance and tracking of optical targets.

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Section: Simulation and Analyzationmentioning

confidence: 99%

A new recognition method aimed at optical reconnaissance attitude based on laser active interference

Shan

Lao

et al. 2023

AOPC 2022: Optical Sensing, Imaging, and Display Technology

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“…[8,9]. Using this method, space distribution of the reflected light can be transformed into measurable time series, whose periodic characteristics can be used to identify some optical characters, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…[8] rests on the conditions of no turbulence available and a great coherence of laser beam. Only preliminary laboratory experiments have been performed in this direction [9]. Of course, the beam quality is reduced under any practical detection conditions, since the most of laser beams are only partially coherent, and the propagation properties can be changed by turbulence.…”

Section: Introductionmentioning

confidence: 99%

Influence of atmosphere turbulence and laser coherence on the identification method based on interference multiple-beam scanning of optical targets

Zhao¹,

He²,

Shan³

et al. 2017

Ukr. J. Phys. Opt.

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Abstract. Using an extended Huygens-Fresnel diffraction integral, we have derived analytical formulae that describe a partially coherent array of Gaussian beams passing through an optical target and going back along the entrance way in a turbulent atmosphere. These formulae include the light intensity distribution at the return place, as well as the light intensity distribution and the spatial correlation at the target place. Using numerical calculations, we have studied the effects of laser coherence length and turbulence strength on the interference fringe contrast and the spatial coherence degree at the target place, together with the light intensity distribution at the return place and the system operating range. We have found that the fringe contrast and the spatial coherence degree at the target place decrease with increasing turbulence strength and decreasing laser coherence length. Then the contrast of light intensity distribution at the return place decreases and the difficulties of identification of optical targets grow. The operating range can be as large as hundred kilometres under a weak-turbulence condition, decreasing rapidly to a kilometre level at strong turbulence.

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Wavefront coded light-field imaging system to achieve substantial retroreflection reduction and anti-laser blinding property

Wang

Dou

et al. 2019

Optik

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A New Identification Method Aimed at Optical Targets Using an Active Interference Laser Beam

Cited by 7 publications

References 16 publications

A new recognition method aimed at optical reconnaissance attitude based on laser active interference

A new recognition method aimed at optical reconnaissance attitude based on laser active interference

Influence of atmosphere turbulence and laser coherence on the identification method based on interference multiple-beam scanning of optical targets

Wavefront coded light-field imaging system to achieve substantial retroreflection reduction and anti-laser blinding property

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