雾衰减经验模型的适用性分析

Applicability analysis of fog attenuation empirical model

雾衰减经验模型的计算是预测雾衰减的一种重要方法。为了将雾衰减经验模型应用到实际中进行适用性分析,从米氏散射理论出发,采用理论推导和仿真分析的方法,计算了Kruse模型、Kim模型和Ijaz模型中激光在不同能见度下的衰减,分析了3个模型在计算衰减系数时的差异,并通过搭建自由空间光通信实验平台,将实验结果与仿真结果对比分析。结果表明,650nm波长的激光在雾衰减信道下的衰减结果与Kim衰减模型更接近。此研究结论为西安地区自由空间光通信系统雾衰减系数分析提供了参考依据。

The calculation of fog attenuation empirical model is an important method to predict fog attenuation.In order to apply the fog attenuation empirical model to practice for applicability analysis,based on Mie scattering theory,the attenuation of the laser under different visibility in the Kruse model,Kim model and Ijaz model was calculated using theoretical derivation and simulation analysis methods.The difference between the three models in calculating the attenuation coefficient was analyzed,and the experimental results were compared with the simulation results by building a free-space optical communication experimental platform.The results show that the attenuation results of the 650nm wavelength laser in the fog attenuation channel are closer to the Kim attenuation model.This research conclusion provides a reference for the analysis of the fog attenuation coefficient of the free space optical communication system in Xi’an.