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为了能够通过水平大气能见度判断可实现的最大通信速率,基于Mie散射理论和脉冲多路径效应,建立了通信速率与水平大气能见度的数学模型;通过蒙特卡罗仿真,得到了800nm和1550nm波段的气溶胶散射粒子的散射参数,给出了2~25km水平大气能见度下两个波段产生的脉冲展宽曲线,分析了初始脉宽、脉冲位置调制元数、水平大气能见度对最大通信速率的影响。结果表明,1550nm波段具有更好的通信效果;随着水平能见度的提高,可实现的最大通信速率也在提高,且在良好的水平能见度下选择小的初始脉宽和较低元的脉冲位置调制,能最大程度地提高深空激光通信速率。
In order to be able to determine the maximum achievable communication rate through horizontal atmospheric visibility, a mathematical model of communication rate and horizontal atmospheric visibility was established based on Mie scattering theory and pulse multipath effect. By means of Monte Carlo simulation, gas at 800nm and 1550nm The scattering broadening curves of the two bands in 2 ~ 25km horizontal atmospheric visibility are given. The influence of initial pulse width, number of modulated positions of pulse and horizontal atmospheric visibility on the maximum communication rate is analyzed. The results show that the 1550nm band has a better communication effect; as the horizontal visibility increases, the maximum achievable communication rate is also improved, and the small initial pulse width and the lower-ary pulse position modulation are selected with good horizontal visibility , To maximize the speed of deep space laser communications.