本文基于河南许昌地区大气衰减模型,对激光脉冲延迟时间的影响进行了仿真研究。结果表明,由许昌地区大气信道引起的脉冲传输延迟时间均在纳秒量级上,输延迟时间随单程散射反照率、传输距离的增大而不断增长,高脉冲延迟时间与单程散射反照率单位距离成正相关。增加激光的波长和能见度,此时将会降低大气衰减系数。在激光波长为0.85μm,单程散射反照率为0.75,单位大气能见度随着传输距离的增加对脉冲传输延迟时间具有显著的影响,在能见度从20.5 km减小到10.5 km,传输距离为21.5 km时,大气所引起的脉冲传输延迟时间增加较大。降低大气的能见度,单位传输距离将会直接影响到脉冲传输延迟时间,如果将13.5 km的激光脉冲传输距离增大至21.5 km,大气能见度为10.5 km时,河南许昌地区大气所引起的脉冲传输延迟时间增加一倍多。

Based on the atmospheric attenuation model in Xuchang, Henan Province, the influence of laser pulse delay time is simulated. The results show that the delay time of pulse propagation caused by the atmospheric channel in Xuchang area is on the order of nanoseconds. The delay time increases with the increase of one-way scattering albedo and transmission distance, and the high pulse delay time is positively correlated with the unit distance of one-way scattering albedo. Increasing the wavelength and visibility of the laser will reduce the atmospheric attenuation coefficient. When the laser wavelength is 0.85 μm and the one-way scattering albedo is 0.75, the visibility per unit atmosphere has a significant effect on the pulse propagation delay time with the increase of transmission distance. When the visibility decreases from 20.5 km to 10.5 km and the transmission distance is 21.5 km, the pulse propagation delay time caused by atmosphere increases greatly. Reducing the atmospheric visibility, the unit transmission distance will directly affect the delay time of pulse transmission. If the laser pulse transmission distance is increased from 13.5 km to 21.5 km and the atmospheric visibility is 10.5 km, the delay time of pulse transmission caused by the atmosphere in Xuchang area of Henan Province will more than double.