首页|The Active Compensation Technique for Large Reflector Antennas Based on Quadratic Curve Fitting

The Active Compensation Technique for Large Reflector Antennas Based on Quadratic Curve Fitting

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Active reflectors are often used to compensate the surface distortion caused by environmental factors that degrade the electromagnetic performance of large high-frequency reflector antennas.This is crucial for maintaining high gain operation in antennas.A distortion compensation method for the active reflector of a large dual-reflector antenna is proposed.A relationship is established between the surface deformation and the optical path difference for the primary reflector by geometric optics.Subsequently,employing finite element analysis,a polynomial fitting approach is used to describe the impact of adjusting points on the reflector surface based on the coordinates of each node.By standardizing the positions of various panels on the reflector,the fitting ns can be applied to the reflector panels of similar shapes.Then,based on the distribution characteristics of the primary reflector panels,the adjustment equation for the actuators is derived by the influence matrix method.It can be used to determine the adjustment amount of actuators to reduce the rms of the optical path difference.And,the least squares method is employed to resolve the matrix equation.The example of a 110 m aperture dual-reflector antenna is carried out by finite element analysis and the proposed method.The results show that the optical path difference is reduced significantly at various elevation cases,which indicates that the proposed method is effective.

Methods:analyticalMethods:numericalTelescopes

Tian-Xiang Zheng、Bin-Bin Xiang、Han-Wei Cui、Wei Wang、Pei-Yuan Lian、Shang-Ming Lin、Yang Zhang、Jian-Ping Zhou、Kai Li

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School of Mechanical Engineering,Xinjiang University,Urumqi 830017,China

School of Mechano-Electronic Engineering,Xidian University,Xi'an 710017,China

Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China

National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)National Natural Science Foundation of China(NSFC)Natural Science Foundation of Xinjiang Uygur Autonomous RegionTianchi Talents Program of XinjiangNational Key Basic Research Program of ChinaXinjiang Postdoctoral Foundation

1236301152275270522752692023D01C222021YFC2203501

2024

10.1088/1674-4527/ad547f

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(7)