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为了研究星地下行激光链路接收光强起伏的统计特性,进行了恒星观测实验,分析了下行传输孔径接收下实际接收光强起伏的归一化方差、概率密度和闪烁频谱,并讨论了接收端瞄准偏差对接收光强的影响和星地下行大气信道的传播特性。实验结果表明,在下行传输孔径接收的条件下,天顶角从0°增至55°时接收光强的归一化方差从0.015增到0.102,不同天顶角下的接收光强起伏概率分布均服从对数正态分布,稳定大气条件下闪烁频谱的高频幂指数为-5/3,不稳定大气条件下为-11/3。
In order to study the statistical characteristics of the fluctuation of receiving laser intensity in the downlink of the satellite, a star observation experiment was conducted, and the normalized variance, probability density and scintillation spectrum of the actual received light intensity fluctuation under the downlink transmission aperture were analyzed. The influence of the aiming deviation on the received light intensity and the propagation characteristics of the descending atmospheric channel in the satellite. The experimental results show that the normalized variance of received light intensity increases from 0.015 to 0.102 when the zenith angle increases from 0 ° to 55 ° under the condition of downlink transmission aperture. The probability distribution of received light intensity fluctuation under different zenith angles All obey the logarithmic normal distribution. The high-frequency exponent of the scintillation spectrum under stable atmospheric conditions is -5/3, and -11/3 under unstable atmospheric conditions.