涡旋电磁波在湍流大气传输中的闪烁问题研究  

Research on the Scintillation Index of Vortex Waves Transmission in Atmospheric Turbulence

作　　者：李玲玲 赵恒凯[1] LI Lingling;ZHAO Hengkai(School of Communication and Information Engineering, Shanghai 200444, China)

机构地区：[1]上海大学通信与信息工程学院

出　　处：《移动通信》2019年第6期60-65,共6页Mobile Communications

基　　金：国家自然科学基金项目(61271061);国家自然科学基金项目(61132003)

摘　　要：涡旋电波的大气传输特性对于轨道角动量通信系统有重要意义。以LG波束为例,对涡旋电波在大气湍流中传输时的闪烁指数进行了研究。主要探讨了大气湍流强度、传输距离、传输高度、涡旋电波的拓扑荷数、束腰半径等因素对闪烁系数的影响。研究结果表明:闪烁指数会随着大气湍流强度、传输距离以及束腰宽度的增大而增大;涡旋电磁波的拓扑荷数增加,闪烁指数会随之增加,同时拓扑荷数对闪烁指数的影响较为明显;在1000m以内,传输高度增加,闪烁指数迅速下降;超过1000m,传输高度对闪烁指数的影响可以忽略不计。The atmospheric transmission characteristics of vortex waves are of great signifi cance for orbital angular momentum communication systems. In this paper, we take the LG beam as an example to investigate the scintillation index of vortex waves transmitted in atmospheric turbulence. We discuss the effects of turbulence intensity, transmission distance, topological charge of vortex waves and beam waist radius. The results show that the scintillation index increases with the intensity of atmospheric turbulence, transmission distance and waist width. The scintillation index increases as the topological charge of the vortex electromagnetic wave increases. At the same time, the infl uence of topological charge on the scintillation index is more obvious. Below 1000 m, the transmission height increases and the scintillation index decreases rapidly. Above 1000 m, the transmission height has a negligible effect on the scintillation index.

关 键 词：拉盖尔-高斯波 毫米波 大气湍流相位屏 

分 类 号：TN929.5[电子电信—通信与信息系统]