摘要
基于蒙特卡罗法建立了多次散射随机模型,并利用该模型对雾环境下非视距大气散射光通信信道传输特性进行了模拟分析。由于大气对可见光波段或者红外光波段的信号光吸收损耗较小,且大气分子对传输信号光产生的瑞利散射作用可以忽略,同时,该波段信号光子与大气中的雾滴粒子等尺度较大的粒子间会发生较强的米氏散射作用,故在长距离散射光通信系统中一般采用该波段的信号光源。模拟时选择的光波长为620nm,分析了在雾环境下通信距离条件不同时,信号光传输的损耗与能见度的关系。结果表明,在给定的通信距离以及给定的系统发送端发送仰角和发送光束束散角、接收端接收仰角和接收视场角等几何参数下,存在一个能见度使得在该能见度条件下信号光传输的损耗最小。
The multiple scattering propagation model with Monte Carlo method is established, and characteristics in non-line-of-sight （NLOS） atmospheric scattering optical communication channel in fog weather are simulated and analyzed by using the model. The absorption loss for visible light or infrared light is relatively low in atmosphere, and the Rayleigh scattering effect generated when visible light or infrared light barges up against air molecules can be ignored. At the same time, there will be a strong Mie scattering effect that occurs between the signal photon in visible light or infrared light wave band and fogdrop particles, so the visible light or infrared light is generally used in long distance scattering optical communication systems. The wavelength selected in simulation is 620 nm, and the relationship between transmission loss and visibility is analyzed in different communication distances in fog weather. The results demonstrate that there will be a visibility that can makes transmission loss lower when the communication range, the elevation angle, the transmitting beam-width divergence and the field-of-view are determined.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2013年第9期1-5,共5页
Acta Optica Sinica
基金
江苏省科技支撑计划(BE2011177)
江苏省自然科学基金(BK2011114
BK2012509)
关键词
大气光学
非视距
蒙特卡罗方法
米氏散射
光通信
能见度
atmospheric optics
non-line-of-sight
Monte Carlo method
Mie scattering
optical communications
visibility
