Application of Vondrak Filtering Method to the Two-Way Satellite Time and Frequency Transfer Based on Software Defined Receiver |
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| Affiliation: | 1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600 China;2. Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600 China;3. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049 China;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023 China;2. Laboratory of Space Object and Debris Observation, Chinese Academy of Sciences, Nanjing 210023 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. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030 China;2. University of Chinese Academy of Sciences, Beijing 100049, China;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;3. National Basic Discipline Public Science Data Center, Beijing 100190;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;2. Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210023;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026 |
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| Abstract: | The SDR-TWSTFT (Two-Way Satellite Time and Frequency Transfer based on Software Defined Receiver) link collects measurement data per second and then fits the raw data into 300 seconds by mathematical model. The time transfer results of the link are therefore affected by short-term measurement noise and non-model errors, and exhibit certain characteristics of random noise. A frequency domain amplitude analysis method is proposed to determine the filtering factor and construct a low-pass Vondrak filter to meet the requirements. By analyzing the measured data of the SDR-TWSTFT link between the NTSC (National Time Service Center) of Chinese Academy of Sciences and the PTB (Physikalisch-Technische Bundesanstalt) of Germany, it is found that the method is effective in filtering the high frequency noise in the average time of the link, can improve the confidence of the link time transfer results, and also the short-term frequency and time stability of the filtered link is significantly improved. |
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