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依据Lambert定律对强度调制/直接探测紫外光通信系统的接收光功率计算公式进行推导,公式表明,距离平方反比衰减和大气透射比衰减是导致接收光功率随距离增大迅速衰减的主要因素,提高通信系统的传输距离只能依靠优化收发系统参数实现;重点针对引起大气透射比衰减的主要因素,利用大气传输软件MODTRAN进行仿真,结果表明,不同大气模型、天气条件和臭氧浓度对大气透射比衰减产生较大影响,从而影响系统的工作距离;根据理论和仿真结果计算出“日盲区”分别在三类主要因素影响下的大气透射比系数的量值,为“日盲”紫外光通信系统工作距离的定量估算提供实用、有效的方法。
According to Lambert’s law, the formula for calculating the received optical power of the intensity modulation / direct detection UV communication system is derived. The formula shows that the inverse square distance attenuation and the atmospheric transmittance attenuation are the main factors that cause the received optical power to decay rapidly with distance increasing The transmission distance of the communication system can only be achieved by optimizing the parameters of the transceiver system. Focusing on the main factors that cause the attenuation of the atmospheric transmittance, the simulation is carried out by MODTRAN. The results show that the attenuation of the atmospheric transmittance of different atmospheric models, weather conditions and ozone concentration Which will affect the working distance of the system. According to the theoretical and simulation results, the values of the atmospheric transmittance coefficient of the “blind zone” under the influence of three main factors are calculated respectively, which is the work of the “blind” UV communication system The quantitative estimation of distance provides a practical and effective method.