Accuracy Analysis of the Pointing and Focusing Calibration of the 5 m Terahertz Telescope for Dome A in Antarcticatwo |
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Authors: | Kang Hao-ran Zuo Ying-xi Lou Zheng He Qian-ru |
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Affiliation: | 1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008;2. University of Chinese Academy of Science, Beijing 100049;3. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008;4. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026 |
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Abstract: | Pointing calibration and sub-reflector focusing are an important task of antenna measurement, which significantly contributes to the observational performance of a radio telescope. According to the requirements on the pointing accuracy and defocusing gain loss of the 5 m Dome A Terahertz Explorer (DATE5), this paper has derived the requirements of signal-to-noise ratio for the pointing and sub-reflector focusing calibration observations, and selected several astronomical radio sources suitable for the pointing and focusing calibrations at the terahertz waveband in Antarctica, which include planets and ultra-compact HII regions. The effects of the atmospheric absorption and the source angular diameter on the accuracy of calibration measurements are analyzed. Simulations show that when the telescope operates in Antarctica, these sources can provide sufficient flux densities for verifying the pre-established pointing model and focusing model. |
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Keywords: | Submillimeter wave Telescopes pointing and focusing methods: simulation |
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