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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。
Based on the Monte-Carlo method, a stochastic multiple scattering model was established and the model was used to simulate the propagation characteristics of non-line of sight (LOS) optical communication channels in fog environment. Due to the small absorption loss of the signal light in the visible light band or the infrared light band, the Rayleigh scattering effect of the atmospheric molecules on the transmitted signal light is negligible. At the same time, the signal photons in the band and the droplet particles in the atmosphere have a larger scale Of the particles will happen stronger Mie scattering, it is generally used in the long-range scattered optical communication system of the band signal light source. The wavelength of the light selected in the simulation is 620nm. The relationship between the loss of signal light transmission and the visibility when the communication distance conditions are different in the fog environment is analyzed. The results show that under the given communication distance and given geometric parameters of elevation angle and beam angle of transmitting beam, receiving angle of elevation and receiving angle of view, the system has a visibility such that the signal light Transmission loss minimum.