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Surface shape detection methods for large radio telescopes

Astronomical Techniques and Instruments 2024年第5期1卷 275-283页

作者： Zhengxiong Sun Jinqing Wang Linfeng Yu Yongchen Jiang Zheng Lou Yongbin Jiang Rongbin Zhao Qian Ye Qinghui Liu Guangli Wang Shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210023China Shanghai Key Laboratory of Space Navigation and Positioning Techniques Shanghai 200030China University of Chinese Academy of Sciences Beijing 100049China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China

The surface accuracy of a radio telescope is directly related to its operational efficiency and detection *** is crucial under high-frequency observation conditions,where surface shape errors need to be controlled to within 1/16 of the working *** addition,the primary reflector of large radio telescopes is subject to dynamic deformation,caused by factors such as gravity and thermal *** paper presents a method for detecting the surface shape of radio telescopes using radio interferometry techniques combined with active reflector adjustment *** enables accurate assessment and correction of surface errors,ensuring the electrical performance of the radio *** study investigates the practical applications of high-precision measurement techniques,such as microwave holography,out-of-focus holography,and wavefront distortion methods at the Tianma 65 m radio telescope(TMRT).Furthermore,the study presents the construction method of gravity models at different elevation angles and demonstrates the efficacy of the active reflector *** results of the measurements indicate that the application of these methods to the TMRT has led to a notable enhancement of the accuracy of the primary reflector and a substantial improvement in efficiency in the *** a process of iterative measurements and adjustments,the surface shape error is ultimately reduced to 0.28 mm root mean square(RMS).

关键词： Radio telescope holographic measurements Surface shape measurements Antenna efficiency

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