空间激光通信中孔径平均效应的计算仿真  

Analyses and calculations of effectiveness of aperture averaging on space laser communication system

作　　者：陆红强[1] 王拉虎[1] 李阳[1] 陈平[1] 刘召庆[1] 

机构地区：[1]西安应用光学研究所,陕西西安710065

出　　处：《应用光学》2012年第3期619-623,共5页Journal of Applied Optics

摘　　要：为了评估孔径平均效应对空间激光通信系统性能的影响,理论分析和数值计算了激光通信系统中传输链路的统计特性,包括闪烁指数、衰落概率、衰落次数和平均衰落时间。结果表明:随着接收天线孔径的增加,传输链路的闪烁指数降低、衰落概率减小、衰落次数减少、平均衰落时间缩短,孔径平均效应使得通信系统性能得到提升。由于强湍流条件下湍流尺寸小,因此孔径平均效应明显。In order to investigate the effects of aperture averaging on the space laser communication system,the fading statistics of transmitted beam are deduced and evaluated,which include scintillation index,probability of fade,number of fade and mean fade time.The results show that the scintillation index,probability of fade,number of fade and mean fade time would be decreased significantly as the receiver aperture increases.The system performances can be improved,especially in the case of strong turbulence due to the small parameters.Based on the methods and the results,the effects caused by aperture averaging on the space laser communication systems can be predicted and estimated effectively.

关 键 词：激光通信 孔径平均效应 闪烁指数 衰落概率 衰落次数 衰落时间 

分 类 号：TN929.12[电子电信—通信与信息系统]