采用烟尘的团簇-团簇凝聚模型和离散偶极子近似方法,分析了紫外光在不同烟尘浓度和粒子半径下的单次和多次散射信道特性,以及散射角对散射光强的影响。研究结果表明,在紫外光短距离直视通信方式下,当粒子半径相同时,随着烟尘浓度的增大,路径损耗不断增大,而当烟尘浓度一定时,路径损耗随着粒径的增大而增大;在紫外光非直视通信方式下,短距离时烟尘浓度及原始半径越大,散射信道路径损耗越小,而长距离通信时烟尘浓度越高,其路径损耗越大,但不同浓度下的路径损耗的差别较小。在多次散射情况下,散射光强随着散射角的增大而减小,而当散射角相同时,烟尘浓度越高,紫外光的散射光强越大。

The cluster-cluster aggregation model of soot and the discrete dipole approximation method are used to analyze the single and multiple scattering channel characteristics of ultraviolet (UV) light under different soot concentrations and particles sizes as well as the influence of scattering angle on the scattering intensity. The research results show that with the UV line-of-sight communication method, the path loss increases with the increase of the soot concentration when the particle radius is the same, meanwhile when the soot concentration is constant, the path loss also increases with the increase of particle size. With the UV non-line-of-sight communication method, the larger the soot concentration and the original radius, the less the path loss of the scattering channels at a short distance. In contrast, at a long distance, the higher the soot concentration,the larger the path loss, however, the difference among path losses for different concentrations is small. In the case of multiple scattering, the scattering light intensity decreases with the increase of scattering angle, while when the scattering angles are the same, the higher the soot concentration, the greater the scattering UV light intensity.