临近空间激光通信信道特性及系统分析

临近空间飞行技术的发展使临近空间激光通信的实现成为了可能。由于临近空间飞行器的飞行特点独特,故信道特性的不同成为临近空间激光通信与一般空间激光通信之间的重要差异之处,因此信道分析是临近空间激光通信的理论研究中的关键内容之一。在分析临近空间激光信道的特殊性的基础上,应用信道衰减和湍流模型,探讨斜程信道随天顶角的变化规律。同时应用光束数值仿真方法模拟临近空间激光信道及通信系统性能,讨论了天顶角变化时衰减和湍流对通信质量的影响,提出对临近空间激光通信系统的可能的重要影响因素。

Analysis of the turbulent channels for near-space free-space laser communications

The development of near-space aviation technology provides the potential to realize near-space laser communications.Due to the special characteristics of the flight courses of the near-space flight vehicles,the difference of channel characteristics becomes the biggest difference between near-space laser communications and common laser communications,thus channel modeling is a key part of the studies on the near-space laser communications.In this paper,based on the analysis of these characteristics,attenuation and turbulence models are established,and the dependence of slant path link on the zenith angle is discussed.Near-space laser communication system is also analyzed by means of numerical beam propagation simulations,which gives the changes in the system performance under different zenith angles,and the results point out the important factors of the optical channel that may significantly affect the near-space laser communication systems.