无公共散射体的紫外光通信传输特性分析

采用基于蒙特卡罗的多次散射模型,研究无 公共散射体传输模型下紫外光(UV)传输特性,对该模型下 UV在大气中传输的平均散射次数随距离的变化情况、路径损耗随传输距离的变化情况 、脉冲响应时间 延迟随传输距离的变化情况以及脉冲响应曲线随能见度的变化情况进行仿真分析。结果显示 ,无公共散射体 传输模型下的UV至少需要两次的大气散射才能够到达接收端,相同传输距离无公共散 射体传输模型的 路径损耗和脉冲响应时间延迟也远高于有公共散射体传输模型的路径损耗和脉冲响应时间 延迟。通过归 一化得到的随能见度变化的脉冲响应曲线发现,无公共散射体传输模型在大气中传输的 脉冲响应时间 延迟不随能见度的变化而变化,但脉冲响应峰值高度随能见度的增大而增高。

Analysis of the transmission characteristics of ultraviolet communication in non-common-scattering volume

This paper uses the multiple scattering model based on Monte Carlo simul ation to study the transmission characteristics of ultraviolet (UV) communication in non-common-s cattering volume.In the model,the variation of the average scattering times of U V light in the atmosphere,the variation of the path loss along with the transmission distance, the change of the pulse response time delay and the variation of the pulse response curve with the visibility are analyzed.The results show that unlike the case of a common scattering volume,at least twice atmospheric scatterings are required to reach the receiving end in non- common-scattering volume model.The path loss and the impulse response time dela y with the same transmission distance for the non-common-scattering volume transmission model are much higher than those the common scattering volume transmission model.The impulse response curve with visibility by normalization can be obtained.It can be found that the time delay of the impulse response of the atmospheric transmission of the UV com munication in non- common-scattering volume is not changed with the visibility,but the peak height of the impulse response increases with the increase of the visibility.