空间光通信中基本振动对误码率的影响分析

Analysis of influence of basic vibration on bit error rate in space optical communications

在探讨卫星振动对空间光通信系统误码率所产生的影响时，有必要分析不同振动类型的影响问题。为了使讨论简单，本文主要侧重对正弦振动进行分析。分析结果表明，当振动持续时间为整周期时，误码率仅为振幅的函数，此时误码率随振幅的增加迅速上升，而与振动频率无关；当振动持续时间为非整周期时，误码率随时间的增加而波动，波动的起伏逐渐减小，误码率趋于仅与振幅有关的常数。该项工作为今后研究卫星复杂振动对空间光通信的影响打下了基础。

It is necessary to analyze the influence of different types of vibrations when discussing the influence of satellite's vibration on bit error rate(BER) in a space optical communication system. In this paper, the vibration of satellite is simplified to a harmonic motion model. The analyzing results show, when the duration is a full period, the BER is the function of vibration's amplitude, and has no relation with frequency of vibration. Following increase of amplitude the BER rapidly increase. When the duration is not full period, following increase of time the BER fluctuates, and the change of BER is less and less, the BER tend to become a constant about amplitude. This work will become the base of the following research, which study the complicate vibration affect BER in free space optical communication. As the same time, this work will offer significative reference to compensation of satellite vibration's effect.