The Study on the Group Delay Jumping of CE-4 VLBI System |
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| Institution: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;2. University of Chinese Academy of Sciences, Beijing 100049;1. Beijing Institute of Spacecraft Environment Engineering, Beijing 100094;2. National Key Laboratory of Science and Technology on Reliability and Environmental Engineering, Beijing 100094;3. Department of Engineering Physics, Tsinghua University, Beijing 100084;4. Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Beijing 100084;1. Yunnan Astronomical Observatories, Chinese Academy of Sciences, Kunming 650011;2. University of Chinese Academy of Sciences, Beijing 100049;3. Institute of Space Physics, Luoyang Normal University, Luoyang 471934;4. Center for Astronomical Mega-Science, Chinese Academy of Sciences, Beijing 100012;1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;2. University of Chinese Academy of Sciences, Beijing 100049;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. Key Laboratory foe Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;1. School of Physical Science and Technology, Xinjiang University, Urumqi830046;2. Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi830011;3. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing210023;4. Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing,Guiyang 550001 |
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| Abstract: | The phase delay software is a key component of VLBI (Very Long Baseline Interferometry) orbit determination system in CE-4 mission, which is critical to deep space exploration. When processing X-band DOR (Differential One-way Ranging) signals of probes in the past, the group delay jumping occasionally occurred in the observed scan. This paper consists of two parts. First, according to the VLBI station signal reception and VLBI center data processing steps, we analyzed the frequency, phase, power, and self-correlation spectrum of the signal, and located the influencing factor at the abnormal analog signal of Kunming (KM) station. Second, the group delay jumping was revised by the post-correction method, which was based on the analysis of the abnormal unwrap phase. We used the corrected phase to get the new group delay, and used orbit determination software to verify the effectiveness of the post-correction method, which upgraded the phase delay processing software. |
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| Keywords: | Radio astronomy: Very Long Baseline Interferometry (VLBI) radio astronomy: group delay jumping methods: data analysis |
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