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基于孔径接收的对数振幅相关函数,结合星地激光下行链路的实际情况,推导了星地下行孔径接收的闪烁频谱表达式。分析了天线孔径和天顶角对闪烁频谱的影响。通过恒星观测实验,对下行孔径接收的闪烁频谱进行了实际测量。实验结果验证了理论计算。研究表明,下行孔径接收的闪烁频谱分为低频段和高频段两部分。低频谱为常量,高频谱呈指数关系变化,指数下降因子为(-11/3)。随着接收孔径尺度增加或天顶角减小,频谱幅值逐渐减小,但闪烁频谱的形状保持不变。
Based on the logarithmic amplitude correlation function of aperture reception, combined with the actual situation of the satellite laser downlink, the scintillation spectrum expression of the downlink aperture reception in the satellite is derived. The influence of antenna aperture and zenith angle on the scintillation spectrum is analyzed. Through the stellar observation experiments, the downlink aperture received scintillation spectrum was actually measured. The experimental results verify the theoretical calculation. The research shows that the scintillation spectrum received by the downlink aperture is divided into two parts: low frequency band and high frequency band. The low frequency spectrum is constant, the high frequency spectrum changes exponentially, and the exponential decrease factor is (-11/3). As the size of the receive aperture increases or the zenith angle decreases, the spectral magnitude decreases gradually, but the shape of the scintillation spectrum remains the same.