在紫外光传输模型的基础上, 基于米散射和瑞利散射理论, 分析了大气分子和气溶胶粒子对紫外光的吸收和散射特性.利用蒙特卡洛方法仿真分析了良好、严重雾霾、极严重雾霾三种天气条件下的紫外光通信系统路径损耗和误码率.使用波长为255 nm的“日盲”紫外LED及光电倍增管作为收发器件, 发射信号采用10 kHz和100 kHz的方波信号, 在三种不同天气情况下进行户外短距离紫外光通信实验.实验结果表明：在通信距离小于100 m条件下, 随着雾霾污染程度的加重, 紫外光直视通信路径损耗逐渐增大, 紫外光非直视通信路径损耗逐渐减小.在进行非直视紫外光通信时, 发射光功率为0.6 mW时, 收发端仰角小于20°, 通信距离小于40 m, 通信质量相对较好.

Based on the model of ultraviolet communication transmission, the absorption and scattering characteristics of ultraviolet communication were analyzed based on the Mie scattering and Rayleigh scattering theory. The impact of different path loss and bit error rate were simulated on the basis of Monte Carlo method under the condition of fine weather, severe fog and haze weather, extremely severe fog and haze weather. Using a 255nm ultraviolet LED as the light source, a photomultiplier as the receiving device and a 10 kHz and 100 kHz square wave signal as the transmitting signal, outdoor short distance ultraviolet communication experiment under three different weather conditions were performed. The experimental results indicate that under the condition of communication distance less than 100 m, with the increasing of fog and haze pollution, the path loss of line-of-sight ultraviolet communication increases gradually, and the path loss of non-line-of-sight ultraviolet communication decreases gradually. In non-line-of-sight ultraviolet communication, when the transmitting power is 0.6 mW, the transmitting and receiving elevation angles are less than 20° and the communication distance is less than 40 m, the communication quality is relatively better.