非视线紫外通信大气传输特性的蒙特卡罗模拟

基于蒙特卡罗方法建立了紫外光非视线传输多次散射模型,利用单次散射近似法和实验方法验证了模型的有效性,并利用该模型完成了非视线紫外光通信大气传输特性的模拟.模拟时光波长取紫外光通信的最佳工作波段(250 nm附近),分析了不同传输距离下能见度、风、雨、雾等参量对系统能量透射比的影响.结果指出,系统能量透射比随传输距离增大而剧烈减小,在天气较差传输条件下能量衰减得更快；风力大小的变化对通信系统影响不大.较近距离通信传输时(一两百米),通信系统受天气条件的影响较小.

Monte Carlo Simulation of Atmospheric Transmission Characteristics in Non-Line-of-Sight Ultraviolet Communication

The Non-Line-of-Sight (NLOS) ultraviolet (UV) propagation model with Monte Carlo method was described in details. The Model was proved validity by the existed single-scattering model, and the model simulation results were in good agreement with experimental results. Then UV atmospheric transmission characteristics in NLOS UV communication were simulated by Monte Carlo model. As far as the communication system of best working wavelength (about 250 nm) was concerned, influences of communication distance, visibility, wind force, rain rate, and fog etc. on the UV atmospheric transmittance were analyzed. The results demonstrate that UV transmittance decrease with the communication distance enlarged, even more quickly in bad weather condition. The wind force always has no affect on the NLOS UV communication system, and the other weather conditions have little influence on the system when distance is less than one or two hundred meters.