Influence of Atmospheric Turbulence on Detection Accuracy of Laser Spot

doi:10.3969/j.issn.1000-1093.2021.02.008

Abstract

Abstract: The mechanism of light intensity flicker, beam drift, angle of arrival fluctuation and beam spread effect to reduce the position accuracy of received laser spot is studied to analyze the influence of atmospheric turblence on the detection accuracy of laser spot in semi-active laser guidance. A quantitative measurement method is proposed for the parameter of atmosperic turbulence intensity (atmospheric refractive index constant). Based on this method, a prototype test was conducted. The speckle image information on the targets recorded under differeent weather conditions is used to calculate the arrivasl angle fluctuation variance and the structure constants of atmospheric refractive index at the irradiation distance of 1 km and 4 km. The laser spot position coordinate data from the output of seeker was tested under the different structure constants of atmospheric refractive index, and the statistical distribution of test data and standard deviation under different experimental conditions were given. The experimental results show that the greater the atmospheric refractive index constant is, the worse the spot detection accuracy is, and the atmospheric refractive index constant is not only related to the atmospheric turbulence intensity, but also related to the irradiation distance, which proves the effectiveness of the proposed method.

Key words: semi-activelaserguidance, spotdetectionaccuracy, laserbeamtransmission, four-quadrantlaserdetector, atmosphericturbulence

CLC Number:

TJ765.3⁺32

LI Haiting, HU Xin, ZENG Shuang, LI Shaobo, ZHOU Guojia, GAO Zhifeng. Influence of Atmospheric Turbulence on Detection Accuracy of Laser Spot[J]. Acta Armamentarii, 2021, 42(2): 297-307.

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