Adjustment Method of Main Reflector for a Large Radio Telescope

Q4 Physics and Astronomy Chinese Astronomy and Astrophysics Pub Date : 2024-07-01 DOI:10.1016/j.chinastron.2024.09.006
Sun Zheng-xiong , Wang Jin-qing , Yu Lin-feng , Zhang Zhi-bin , Wang Guang-li
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Abstract

The performance of the antennas, which plays an important role in millimeter-wave astronomy and space communication, is often limited by their reflector surface accuracy. Microwave holography is a fast and effective technique for measuring the surface profile of reflector antenna. In this paper, the antenna aperture phase profile is obtained by microwave holography to estimate the deviation between the reflector of the Tianma 65 m radio telescope and the ideal paraboloid. The panels of the Tianma 65 m radio telescope is in radial pattern with 14 rings. Each corner of the panel is fixed on the screw of the actuator to move up and down, and the adjacent corners of the four panels share an actuator. We use the method of plane fitting to calculate the adjustment value of every panels corner. But one actuator, which simultaneously controls the common corner of the adjacent panels, will have different adjustment values according to the plane fitting equation based on adjacent panels. In this paper, an adjustment value at the corner of the adjacent panel is obtained by plane fitting and adjustment calculation method with the antenna illumination function as the weight, that is, the optimal adjustment value of 1104 actuators of the Tianma 65 m radio telescope. Through many adjustments and the application of new algorithms, the surface accuracy of the reflector of the Tianma 65 m radio telescope has gradually improved to the current 0.24 mm.

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大型射电望远镜主反射镜的调节方法
天线在毫米波天文学和空间通信中发挥着重要作用,其性能往往受到反射器表面精度的限制。微波全息技术是测量反射天线表面轮廓的一种快速有效的技术。本文利用微波全息技术获得天线孔径相位轮廓,以估算天马 65 米射电望远镜反射镜与理想抛物面之间的偏差。天马 65 米射电望远镜的面板呈放射状,有 14 个圆环。面板的每个角都固定在推杆的螺杆上,可以上下移动,四个面板的相邻角共用一个推杆。我们使用平面拟合的方法来计算每个面板角的调整值。但是,根据相邻面板的平面拟合方程,同时控制相邻面板公共角的一个推杆会有不同的调整值。本文以天线照度函数为权重,通过平面拟合和调整计算方法,得到了相邻面板转角处的调整值,即天马 65 米射电望远镜 1104 个推杆的最优调整值。经过多次调整和新算法的应用,天马 65 米射电望远镜反射镜的表面精度逐步提高到目前的 0.24 毫米。
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来源期刊
Chinese Astronomy and Astrophysics
Chinese Astronomy and Astrophysics Physics and Astronomy-Astronomy and Astrophysics
CiteScore
0.70
自引率
0.00%
发文量
20
期刊介绍: The vigorous growth of astronomical and astrophysical science in China led to an increase in papers on astrophysics which Acta Astronomica Sinica could no longer absorb. Translations of papers from two new journals the Chinese Journal of Space Science and Acta Astrophysica Sinica are added to the translation of Acta Astronomica Sinica to form the new journal Chinese Astronomy and Astrophysics. Chinese Astronomy and Astrophysics brings English translations of notable articles to astronomers and astrophysicists outside China.
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