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利用光子追踪法建立了红外大气信道传输模型,并给出传输损耗理论表达式。分别采用朗伯-比尔定律和蒙特卡罗仿真方法计算传输损耗,并将两个结果进行对比分析。结果显示,在能见度较低,通信距离较近时接收机接收到的散射能量不能被忽略。分析了近红外、中红外及远红外在不同能见度、通信距离下的传输损耗。结果显示,在辐射雾条件下,波长为10.6μm的远红外光传输损耗最小;在平流雾条件下,能见度小于200 m时,波长为0.85μm的近红外光传输损耗较小,能见度大于200 m时,波长为10.6μm的远红外光传输损耗最小。
Infrared atmospheric channel transmission model was established by photon tracing method, and the theoretical expression of transmission loss was given. The transmission loss was calculated by Lambert-Beer law and Monte Carlo simulation respectively. The two results were compared and analyzed. The results show that the scattering energy received by the receiver can not be ignored when the visibility is low and the communication distance is short. The transmission losses of near-infrared, mid-infrared and far-infrared at different visibility and communication distance were analyzed. The results show that the transmission loss of far-infrared light with the wavelength of 10.6μm is the smallest under the condition of radiation fog. When the visibility is less than 200m, the near-infrared light with the wavelength of 0.85μm has less transmission loss and the visibility is more than 200 m , The far-infrared light transmission loss with a wavelength of 10.6 μm is the smallest.