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为研究高空大气信道对紫外激光通信的影响,引入散射链路所在高度信息修正紫外光单次散射链路模型;依照大气密度和臭氧浓度垂直分布得到紫外光散射系数和吸收系数变化规律;对高空15km以下信号传播的时延、信噪比和信道容量进行仿真分析,得到以上三者的高空垂直分布。结果表明:高空大气环境对紫外光的消光系数主要由吸收系数决定;较小的散射作用令高空通信时延比近地面通信略低;吸收作用导致信噪比和信道容量均随通信平台位置高度增加而减小。高空紫外通信基本满足低速语音通信的要求。
In order to study the influence of the upper air channel on the ultraviolet laser communication, the single-scattering model of the ultraviolet light is modified by introducing the height information of the scattering link. The variation rule of ultraviolet light scattering coefficient and absorption coefficient is obtained according to the vertical distribution of atmospheric density and ozone concentration. The signal propagation delay, signal-to-noise ratio and channel capacity under 15km are simulated and analyzed, and the vertical distribution of above three is obtained. The results show that the extinction coefficient of ultraviolet light in the upper atmosphere is mainly determined by the absorption coefficient. The smaller the scattering effect, the lower the communication delay is. The absorption results in the signal-to-noise ratio and the channel capacity as the height of the communication platform Increase and decrease. High-altitude ultraviolet communications basically meet the requirements of low-speed voice communications.