Influence and Correction of Wavefront Primary Aberrations for Radio Telescopes using Aberration Theory

被引：3

作者：

Xiang, Bin-bin ^{[1
]}

Wang, Wei ^{[2
]}

Ban, You ^{[1
]}

Lin, Shang-min ^{[3
]}

Wen, Zhi-gang ^{[4
]}

He, Da-lin ^{[4
]}

Cai, Ming-hui ^{[4
]}

机构：

[1] Xinjiang Univ, Sch Mech Engn, Urumqi 830017, Peoples R China

[2] Xidian Univ, Sch Mechanoelect Engn, Xian 710071, Peoples R China

[3] Chinese Acad Sci, Xian Inst Opt & Precis Mech, Xian 710119, Peoples R China

[4] Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Peoples R China

来源：

RESEARCH IN ASTRONOMY AND ASTROPHYSICS | 2023年 / 23卷 / 02期

基金：

中国国家自然科学基金;

关键词：

telescopes; methods: analytical; instrumentation: miscellaneous; CASSEGRAIN ANTENNA; REFLECTOR ANTENNA; FIELDS;

D O I：

10.1088/1674-4527/aca64b

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Dual-reflector antennas are widely used in astronomical observations and satellite communication. Structural deformations of the reflectors for radio telescopes are inevitable in outside working conditions due to exterior environment loads, which will cause distortion in the surface of the primary reflector and displacement of the subreflector, then lead to gain degradation and misalignment. In this paper, the influence and correction of misalignment in a dual-reflector antenna have been studied. From the perspective of wavefront aberration, a method is proposed to correct the wavefront primary aberration by adjusting the subreflector position. The characteristics of wavefront errors caused by structural deformation of the reflector have been analyzed, and relationships between the position motions of the subreflector and the Seidel wavefront aberrations are derived. The adjustment quantities of the subreflector are also derived. The results show the appropriate positional change of the subreflector in the lateral and axial directions can effectively correct the effects of the tilt and defocus in the primary aberrations caused by antenna structural deformations.

引用

页数：10