介绍了紫外光大气传输理论和非直视单散射模型.在此模型基础上, 针对紫外光通信系统的结构设计对信道能量损耗的影响进行了理论上的定性分析.对不同天气、不同通信模式、不同几何结构参量条件下, 大气信道所产生的能量损耗进行了定量仿真.仿真结果表明：能量衰减随通信距离的增加而增大；不同能见度条件下, 能量衰减随通信距离的递增程度不同, 能见度越高能量衰减越小, 可实现的通信距离越远；通信距离随发射仰角的减小而增加, 随接收仰角的减小而增加, 且发射仰角对通信距离的影响程度大于接收仰角；通信距离随发射束散角的增加而增加, 随接收视场角的减小而增加, 且接收视场角对通信距离的影响程度远大于发射束散角.

The UV atmospheric transmission theory and the nonline of sight single scattering channel model were introduced. According to the model, the transmission loss caused by atmospheric channel under different structure design was quantitatively analyzed. Attenuation was quantitatively simulated under different atmospheres, communication patterns and structure parameters. Experimental results show that attenuation increases with increasing transmission distance; under different visibility, attenuation increasing different, and the higher visibility, the less attenuation, the far transmission distance; transmission distance increases with decreasing launching elevation and receiving elevation, and influence degree of launching elevation is more series than receiving elevation; transmission distance increases with increasing beam divergence angle and decreasing field angle, and influence degree of field angle is more series than beam divergence angle.