大气湍流对半主动激光制导中光斑检测精度的影响

doi:10.3969/j.issn.1000-1093.2021.02.008

摘要/Abstract

摘要： 为分析大气湍流对半主动激光制导中激光光斑检测精度的影响，结合半主动激光制导的工作原理，研究了光强闪烁、光束漂移、到达角起伏和光束扩展效应降低接收光斑位置精度的机理。提出一种用于表征大气湍流强度的参数（大气折射率常数）定量测试方法，基于该方法进行了样机测试实验。利用不同天气条件下记录的靶标上光斑图像信息，计算出到达角起伏方差，由此计算出照射距离分别为1 km和4 km时的大气折射率结构常数，测试在不同大气折射率结构常数下导引头输出的接收光斑位置坐标数据,并给出了在不同实验条件下测试数据的统计分布特征和标准偏差。实验结果表明：大气折射率常数越大，光斑检测精度越差；而大气折射率常数不仅与大气湍流强度有关，还与照射距离有关；证明了该测试方法的有效性。

关键词: 半主动激光制导, 光斑检测精度, 激光束传输, 四象限激光探测器, 大气湍流

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

中图分类号:

TJ765.3⁺32

李海廷，胡鑫，曾双，李少波，周国家，高志峰. 大气湍流对半主动激光制导中光斑检测精度的影响[J]. 兵工学报, 2021, 42(2): 297-307.

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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