The Experiment and Analysis on VLBI Observations of Space Passive Hydrogen Maser |
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| Institution: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030 China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Department of Astronomy, University of Science and Technology of China, Hefei 230026, China;2. Polar Research Institute of China, Shanghai 200136, China;3. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, China;4. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, China;5. School of Physics and Electronic Information, Anhui Normal University, Wuhu 241002, China;1. College of Mathematics and Physics Science, Hunan University of Arts and Science, Changde 415000, China;2. Center for Astrophysics, Guangzhou University, Guangzhou 510006, China;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023 China;2. National Astronomical Observatory of Japan, Mitaka 181-8511, China;1. School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550025 China;2. Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing, Guizhou Normal University, Guiyang 550001, China;1. Department of Information Engineering, Dezhou Mechanical and Electrical Engineering School, Dezhou 251200, China;2. Department of Information Engineering, Technological Vocational College of Dezhou, Dezhou 251200, China |
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| Abstract: | China plans to establish a lunar orbital VLBI (Very Long Baseline Interferometer) station around 2025, which will carry a space passive hydrogen maser as the time and frequency reference. Since it is the first time to use a space passive hydrogen maser for VLBI observation, its feasibility needs to be studied and verified. Therefore, we carried out VLBI observations using the space passive hydrogen maser as the frequency reference. In the experiment, the active hydrogen atomic clock and space passive hydrogen maser were used as the frequency standard, and the alternate VLBI observations of China’s Mars probe TW1 (Tianwen 1) were carried out using the 25 m radio telescope at Sheshan, Shanghai, and other VLBI stations. The results of data processing and analysis show that the standard deviation of VLBI residual group delay based on both active hydrogen atomic clock and space passive hydrogen maser are within 0.5 ns, which indicates that the space passive hydrogen maser can meet the accuracy requirements of VLBI measurement for deep space exploration, and verify its feasibility as the frequency standard of lunar orbital VLBI stations. |
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