大气湍流与平台微振动的存在会导致星地激光通信链路的随机信道衰减，使通信质量无法得到保证。为了研究大气湍流与平台微振动共同影响下的星地激光通信性能，建立了联合星地激光链路随机衰减模型，并基于二进制相移键控调制、外差相干接收给出了该模型下系统平均误码率的闭合表达式。仿真分析了不同星地激光通信系统参数对系统误码率性能的影响，研究结果可为实际星地激光通信系统的设计提供一定的理论参考。

The existence of atmospheric turbulence and platform micro-vibration will cause the random channel attenuation of the satellite-to-ground laser communication links， which leads to the unstable communication quality. To further analyzes the performance of satellite-to-ground laser communications with the influence of atmospheric turbulence and platform micro-vibration， a random attenuation model of joint satellite-to-ground laser link is established. Based on binary phase shift keying modulation and heterodyne coherent reception， the closed form expression of system average bit error rate under the model is given. The influence of different satellite-to-ground laser communication system parameters on the bit error rate performance is analyzed by simulation. The research results can provide a theoretical reference for the design of practical satellite-to-ground laser communication system.