通过分析大气湍流和地物散射对传输激光束的调制机理，运用双随机统计理论研究了空-地-空传输路径空载探测器接收到的光闪烁统计问题。闪烁统计由大气湍流和地物(岩石、海洋和森林等)散射的联合效应给出。分析中采用最速下降法处理概率积分，获得了与岩石、海洋和森林二大类地物散射体对应的闪烁概率密度函数。广义Chi-Squared地面散射与大气湍流综合调制效应明显地压缩了概率分布的宽度并使分布函数的峰值移向归一化强度的低端。

We study the statistics of scintillation at the airborne receiver for space earth space link by analysed the modulatory mechanism of atmospheric turbulence and terrain scattering on propagating laser beam. The scintillational statistics are governed by the joine effects of atmospheric turbulence and terrain scattering (such as terrain, sea and forest). The probability density functions of scintillation for the terrain, the sea surface and the forest, the two scattering terrain model was obtained, in which the probability integral is made by the method of steepest descent. The joine distribution of geneval Chi-Squared distribution for scattering terrain and atmospheric turbulance is found flatten markedly and its peak shifts to the low end of normalized irradiance.