Reflector Deformation Measurement and Correction Methodology of Large Antenna Based on Phased Array Feed

被引：0
|
作者：
Wang, Zan [1 ,2 ]
Kong, De-Qing [1 ,2 ]
Zhang, Hong-Bo [1 ,2 ]
Su, Yan [1 ,2 ]
Zhu, Xin-Ying [1 ,2 ]
Wang, Cong-Si [3 ]
Liu, Yu-Chen [1 ,2 ]
机构：
[1] Chinese Acad Sci, Natl Astron Observ, Key Lab Lunar & Deep Space Explorat, Beijing 100101, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Xidian Univ, Key Lab Elect Equipment Struct Design, Minist Educ, Xian 710071, Peoples R China
来源：
RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2024年 / 24卷 / 03期
基金：
中国国家自然科学基金;
关键词：
telescopes; methods: analytical; methods: numerical; COMPENSATION; DISTORTION;
D O I：
10.1088/1674-4527/ad2ac2
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
To solve the problem of time-consuming measurement and correction of large antennas' reflector deformation, a new microwave holography methodology based on a Phased Array Feed (PAF) is proposed. Starting from the known expression of receiving signals in microwave holography, the theory of PAF holography is derived through Geometrical Optics. Reflector deformation, as well as pointing deviation and subreflector offset, can be calculated out by applying the derived equations. A measurement and correction system based on PAF holography is depicted, and two kinds of measurement methods are illustrated. The proposed measurement methodology is verified by numerical simulation, and its measurement error is analyzed. The results indicate that our proposed methodology is feasible, especially for Cassegrain antennas.
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页数：12
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