简化振动模型下空间光通信系统误码率分析

在空间光通信系统中,由于卫星振动将对系统的误码率产生影响,在探讨振动对误码率影响问题时,应分析不同振动类型的影响问题.侧重分析了正弦振动,并分别对方波、三角波、锯齿波型振动进行了分析.结果表明,对于正弦振动,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起伏,误码率的改变越来越小,且趋于仅与振幅有关的常数.其它类型的振动也有类似的结果.

Analysis of bit error rate in a space optical communication system under a simplified vibrating model

Because of the vibration of the satellite,the bit error rate(BER) will be influenced in a space optical communication system.The influence of different types of vibrations should be analyzed when discussing the influence of the satellite vibration on bit error rate.The satellite vibration is firstly simplified to a harmonic motion model.Then square wave,triangle wave and backle wave types of vibrations are respectively analyzed.For sine vibration,the analyzing results show that BER is the function of vibration amplitude and has no relation with vibration frequency when the duration is full period.With vibration amplitude increasing,BER rapidly increases.When the duration is not full period,following increase of time,BER fluctuates and the change of BER is less and less and tendency a constant with amplitude.