用于卫星下行链路的 Togs 主镜低阶像差抑制技术

IF 0.7 4区 物理与天体物理 Q4 OPTICS
Ming Liu, Hongwei Zhao, Guanyu Wen, Xiaolin Li, Chengwei Zhu
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引用次数: 0

摘要

作为激光通信网络的重要组成部分,可移动光学地面站(TOGS)的开发日益受到关注。本文的研究对象是为低地球轨道光学卫星下行链路和远距离飞机下行链路设计的 TOGS。本文提出了一种复合重力补偿支架,可简化并有效地抑制 800 毫米孔径主镜的低阶像差,TOGS 的光学天线在改变指向时方向可变。在本研究中,我们首先介绍了 TOGS 的组成和各部分的功用。其次,以主镜变形最小化为优化目标,采用粒子群优化算法,通过 Isight 软件找到几个关键结构参数的最优值。接下来,我们采用环形 Zernike 多项式拟合主镜整个表面的波前误差,以描述低阶像差,证明当仰角从水平变为垂直时,复合支架能有效抑制波前误差,使其小于 ⋋ /27。最后,ZYGO 干涉仪的波前检测结果表明,在消除了制造缺陷后,水平和垂直轴上整个反射镜表面因变形而产生的波前误差均方根值分别为 0.04⋋和 0.035⋋。与拟合波前误差的结果相比,相对误差分别为 9.5% 和 8.1%。结果表明了优化的复合支架和波前拟合方法的有效性和可行性,证明其对用于卫星下行链路的 TOGS 米级光学天线系统波前误差的预算和分配具有参考意义。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Low-Order Aberration Suppression on Primary Mirror of the Togs for Satellite Downlink

There is a growing interest in the development of transportable optical ground station (TOGS) as an important component of laser communication network. The object of this paper is a TOGS designed for optical LEO satellite downlink as well as for long-distance aircraft downlink. A composite gravity compensation mount is proposed to simplify and efficiently suppress the low-order aberrations of an 800 mm aperture primary mirror with variable orientation of the optical antenna of a TOGS as it changes pointing. In this study, first we describe the composition of the TOGS and the utility of each part. Second, taking the minimization of the primary mirror deformation as the optimization objective, we employ the particle swarm optimization algorithm to find the optima of several key structural parameters by Isight software. Next, the annular Zernike polynomials are adopted to fit the wavefront error over the entire surface of the primary mirror for describing low-order aberrations, proving that the composite mount effectively suppresses the wavefront error to smaller than ⋋ /27, as the elevation angle changes from the horizontal to the vertical one. Finally, the ZYGO interferometer wavefront detections show that, after eliminating fabrication imperfections, the RMS of the wavefront error over the entire surface of the mirrors for horizontal and vertical axes, due to deformation, are 0.04⋋ and 0.035⋋, respectively. Compared to the results of the fitted wavefront error, the relative errors are 9.5% and 8.1%. The results show the validity and feasibility of the optimized composite mount and the wavefront fitting method, which can prove its reference significance for the budget and allocation of the systematic wavefront error in meter-scale optical antenna of the TOGS for satellite downlink.

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来源期刊
CiteScore
1.50
自引率
22.20%
发文量
73
审稿时长
2 months
期刊介绍: The journal publishes original, high-quality articles that follow new developments in all areas of laser research, including: laser physics; laser interaction with matter; properties of laser beams; laser thermonuclear fusion; laser chemistry; quantum and nonlinear optics; optoelectronics; solid state, gas, liquid, chemical, and semiconductor lasers.
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