| 数字边带分离校准研究 |
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| 引用本文： | 刘明,林镇辉,史生才.数字边带分离校准研究[J].天文学报,2022,63(4):46-95. |
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| 作者姓名： | 刘明 林镇辉 史生才 |
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| 作者单位： | 1. 中国科学院紫金山天文台;2. 中国科学技术大学天文与空间科学学院 |
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| 基金项目： | 国家自然科学基金项目(11873101)资助； |
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| 摘 要： | 边带分离(Sideband-separating, 2SB)接收可实现上边带(Upper Sideband, USB)和下边带(Lower Sideband, LSB)信号同时观测,观测效率高且上、下两边带不会出现混叠.因此在射电天文观测应用中越来越受到重视.由于全模拟边带分离接收机存在难以克服的幅度和相位误差,导致了边带抑制率较低,影响了系统的性能.数字边带分离接收机可通过数字信号处理方法,有效改善系统边带抑制率.在3–18 GHz频段构建数字边带分离接收机原理实验,并基于边带分离理论和数字校准方法,实现实验系统的边带不平衡度校准,大大改善了系统的边带抑制率.
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| 关 键 词： | 射电天文接收机 天文仪器 边带分离 边带校准 方法:数据分析 |
| 收稿时间： | 2021/9/23 0:00:00 |
Research on Calibration of Digital Sideband Separation |
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| LIU Ming,LIN Zhen-hui,SHI Sheng-cai.Research on Calibration of Digital Sideband Separation[J].Acta Astronomica Sinica,2022,63(4):46-95. |
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| Authors: | LIU Ming LIN Zhen-hui SHI Sheng-cai |
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| Institution: | Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026 |
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| Abstract: | Sideband-separating (2SB) receiver can simultaneously observe the upper sideband (USB) and lower sideband (LSB) signals, with high observation efficiency and no aliasing on the upper and lower sidebands. It has attracted more and more attention in the field of radio astronomy. Due to the amplitude and phase errors of the fully analog sideband separation receiver that are difficult to overcome, the sideband separation ratio is low, which affects the performance of the system. Digital sideband separation receivers can effectively improve the system''s sideband separation ratio through digital signal processing methods. A digital sideband-separation receiver prototype system was built in the 3--18GHz band. Based on the sideband separation theory and digital calibration method, the calibration of the experimental system is realized, which greatly improves the sideband separation ratio of the system. |
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| Keywords: | radio astronomical receiver astronomical instrumentation sideband separation sideband calibration methods: data analysis |
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