振动对星间相干激光通信的影响

针对星间相干激光通信中卫星平台的振动造成发射天线和接收天线的瞄准角误差，使系统信号信噪比下降，误码率 (BER)增加，该文以瑞利分布作为振动造成的瞄准角误差模型，结合高斯本振光和艾里信号光外差检测模型，以PSK零差通信体制为例分析卫星振动对系统的瞬时误码率和平均误码率的影响，给出误码率仿真计算结果。指出接收天线瞄准角误差对星间光通信质量影响很大，在瞄准角误差的标准偏差σ小于1μrad范围内，系统误码率小于10^-6。

Effect of vibration on intersatellite coherent laser communication

In the intersatellite coherent optical communication,the vibration of a satellite will lead to a pointing error of transmitting and receiving antennas,which will decrease the signal-tonoise ratio and increase the bit error rate (BER). In this paper,the Rayleigh distribution is taken as the pointing error model caused by satellite vibration,and PSK homodyne communication scheme is used as an example to analyze the influence of the satellite vibration on the system instantaneous BER and average BER. The simulation calculation result of BER is given. It is pointed out that the pointing error of receiving antenna will have a great influence on the quality of the intersatellite optical communication,and the system BER will be less than 10－6 while the standard deviation σ of the pointing error is less than 1μrad.