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城市路径下激光光强起伏特性测量及链路余量估算
Measurement of statistical properties of laser irradiance scintillation and link margin evaluation over densely urbanised terrain
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摘要: 在城市环境下进行了3.5 km的激光大气传输实验.实验中对光强起伏和到达角起伏进行了同步测量,分析了接收光强起伏的统计特性以及传输路径上大气折射率结构常数的特性.基于实验结果,对自由空间光通信中不同闪烁指数下的衰落冗余以及不同探测阈值下的衰落概率进行了估算,从而为空间光通信系统的设计提供可靠的实验基础.Abstract: An experiment of laser beam propagation was carried out on 3.5 km urbanised path. The irradiance scintillation and angle of arrival were synchronously measured. The statistical characteristic of irradiance fluctuation and atmospheric refractive-index structure constant are analyzed. Estimates of scintillation fade margin for different scintillation variance and probability of fade for different fade threshold in free space optical communications are made. The atmospheric refractive-index are mostly above 10-14 m-2/3, and the scintillation index mainly range from 0.01 to 0.79, in the urbanised environment. The results can provide experimental basis for the design of free space optical communication system.
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