【摘要】 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。更多还原

【Abstract】 Based on Lambert law,a formula about photo-power received by ultraviolet communication system of intensity modulate/direct detection was deduced.According to the formula,inverse ration of square distance attenuation and atmospheric transmission attenuation are the main factors leading to the power attenuation with the distance increase.The only effective method to improve the transmission distance is to optimize the parameters of the transceivers.Aiming at the main factor of the atmospheric transmission,simulation using atmospheric transmission software-MODTRAN was carried out.The result shows that atmospheric model,weather condition and degree of ozone will decrease the transmission power obviously,which will shorten the communication distance.On the basis of the theory and simulation,atmospheric transmission per kilometer under the three main factors was calculated.It gives effective way to simulate and budget and evaluate the transmission distance of ultraviolet communication systems in solar-blind.更多还原