中文摘要：

虽然气候因素和大气本身对船舶大气激光通信系统的性能影响极大,但现有的研究多集中于讨论大气对激光束造成的散射衰减.本文指出在雨中的自由空间光通信主要受雨滴直接遮挡的影响,尤其是雨滴形成的投影间的重叠效应,该效应能够很好地解释大雨甚至暴雨中激光仍能通过的现象.文中结合雨滴尺寸分布模型,建立了船舶大气激光通信中雨滴遮挡作用的数理模型,对光在雨中的最大传输距离及其光强的衰减做了初步计算与实验.结果证明,该衰减模型是合理的,理论模型基本符合实验结果.该项研究为进一步探索船舶大气激光通信系统的性能奠定了基础.

英文摘要：

Weather conditions and atmosphere have greater influence on the free space Atmospheric Laser Communication （ALC） between the ships. However, most of the research work focus on the discussion on the scattering attenuation of laser beams caused by atmospheric effects. This paper points out that the free space laser communication in raining is influenced by the blotting-out effect of the rain drops mainly, especially the overlapping effect between the projecting areas of rain drops on a receiver. By which, the phenomena that the ALC is achieved within a certain distance in heavy rains is well explained. Based on the raindrop size distribution, a mathematical model of the attenuating effect of rain＇s blotting-out on the ALC is presented, and the transmitting distance of ALC and the attenua- tion of the light intensity are calculated. The results show that the model is reasonable and results of the model is coincided basically with that of the experiments. The obtained results provides a basis for research of the performance of ship free space laser communication.