离轴天线在卫星激光通信系统中的应用

离轴天线在卫星激光通信系统中的应用

内容简介：现有卫星激光通信终端通常采用同轴两反天线结构，该结构存在接收视场小、发射效率低等缺点。为消除同轴两反结构存在的固有缺陷，提高卫星激光通信系统的瞄准和捕获效率，研究了利用离轴三反结构提高卫星激光通信系统的性能。首先根据基本像差理论，推导得到离轴三反光学结构的初始结构方程。利用离轴结构具有更多设计参量的优势，对离轴三反结构进行优化设计，给出了设计实例。计算机仿真得到的光学传递函数、点列图、衍射包围圆能量和波前误差等均表明：离轴三反结构与同轴两反结构相比，具有更加优异的性能，能够满足卫星激光通信系统不断提升的性能要求。

Abstract：The coaxial two-mirror reflective te lescope was usually used within a typical satellite laser communication terminal, which has the disadvantage of small field of view and low emission efficiency. In order to eliminate the inherent defects of the existing coaxial two-mirror reflective telescope, and improve the pointing and tracking efficiency of the satellite laser communication system, off-axis three-reflective optical telescope was designed for satellite laser communication terminal. The initial structure of the off-axis telescope was deduced according to the basic aberration theory, and the off-axis three-mirror reflective telescope with more lager field of view and higher efficiency was given. Simulation results of modulate transfer function, spot diagram, diffraction encircled energy and wavefront error all show that the off-axis three mirror reflective structure has the better performance compared with the coaxial two-mirror reflective structure, and meets the increasing design requirements of satellite laser communication system.

作者：俞建杰, 李宣娇, 谭立英, 马晶, 韩琦琦,

关键词：卫星激光通信, 离轴天线, 离轴三反天线, 同轴两反天线,