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为了研究降雨对自由空间量子通信的影响,根据雨滴分布谱和Mie散射理论,研究了降雨强度对消光系数的影响,提出了光量子衰减、信道容量与降雨强度的关系,建立了信道生存函数、传输距离的计算模型,并进行了系统性能参数的仿真。结果表明,在忽略大气气溶胶等其他粒子影响的情况下,当降雨强度为1.46mm/h,传输距离为3km时,光量子衰减为初始能量的50%,信道容量为0.2702,信道生存函数为0.9122,信道误码率为1.8×10~(-8)。由此可见,降雨对自由空间量子通信的信道容量、生存函数、误码率有不同程度的影响。因此,为了提高自由空间量子通信的可靠性,应根据降雨强度,自适应调整通信系统的各项参数。
In order to study the effect of rainfall on free space quantum communication, the influence of rainfall intensity on extinction coefficient was studied according to raindrop distribution spectrum and Mie scattering theory. The relationship between light quantum attenuation, channel capacity and rainfall intensity was put forward. The channel survival function, Distance of the calculation model, and the system performance parameters of the simulation. The results show that when the rainfall intensity is 1.46 mm / h and the transmission distance is 3 km, ignoring the influence of other aerosols and other particles, the photon decays to 50% of the initial energy, the channel capacity is 0.2702 and the channel survival function is 0.9122 , The bit error rate of the channel is 1.8 × 10 -8. Thus, rainfall has different effects on the channel capacity, survival function and bit error rate of free space quantum communication. Therefore, in order to improve the reliability of quantum communication in free space, the parameters of the communication system should be adaptively adjusted according to the rainfall intensity.