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为了研究远距离水平激光链路接收光强起伏的统计特性,进行了16km水平激光传输实验。介绍了大气闪烁的对数正态与伽马-伽马分布模型,根据实验结果分析了孔径接收下信号衰落的统计规律。实验结果表明:伽马-伽马与对数正态分布在较大孔径接收时都能较好地分析远距离传输的光强起伏分布,而且分别是信号性能的上限与下限。采用何种模型要根据实际接收情况,较小孔径接收时,采用伽马-伽马较为准确。由于孔径平均效应和闪烁饱和效应,10-6衰落几率条件下16km激光链路孔径接收衰落阈值只有6～10dB。
In order to study the statistical characteristics of the laser light intensity fluctuation received at a long distance level, a 16km horizontal laser transmission experiment was carried out. The logarithmic normalization and gamma - gamma distribution model of atmospheric flicker are introduced. According to the experimental results, the statistical law of signal fading under aperture reception is analyzed. The experimental results show that the gamma-gamma and log-normal distributions can well analyze the light intensity distribution of long-distance transmission when receiving large aperture, and are the upper and lower limits of signal performance respectively. What model to use according to the actual reception, smaller aperture receiver, the use of gamma - gamma is more accurate. Due to the aperture average effect and scintillation saturation effect, the aperture fading threshold of 16km laser link is only 6 ~ 10dB under the 10-6 fading probability.