Status of Satellite Orbit Determination and Time Synchronization Technology for Global Navigation Satellite System |
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| Institution: | 1. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;2. Beijing Satellite Navigation Center, Chinese Academy of Sciences, Beijing 100092;3. National Defenses University, Beijing 100091;1. Key Laboratory foe Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033;2. University of Chinese Academy of Sciences, Beijing 100049;3. School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;1. College of Big Data and Information Engineering/College of Physics, Guizhou University, Guiyang 550025;2. School of Physics and Electronics, Qiannan Normal University for Nationalities, Duyun 558000;3. Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030;1. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210033;2. Key Laboratory for Dark Matter and Space Astronomy, Chinese Academy of Sciences, Nanjing 210033;3. University of Chinese Academy of Sciences, Beijing 100049;4. Paul Scherrer Institut, Villigen 5232;1. College of Mathematics and Physics Science, Hunan University of Arts and Science, Changde 415000;2. Center for Astrophysics, Guangzhou University, Guangzhou 510006;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. CAS Key Laboratory of Planetary Sciences, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;1. National Time Service Center, Chinese Academy of Sciences, Xi’an 710600;2. Key Laboratory of Time and Frequency Primary Standards, National Time Service Center, Chinese Academy of Sciences, Xi’an 710600;3. School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049;4. University of Chinese Academy of Sciences, Beijing 100049 |
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| Abstract: | In the form of satellite ephemerides and clock parameters, the information of space datum and system time of one global navigation satellite system (GNSS) is transferred to users. With continuously updating of satellite payload such as high precision atomic clocks, monitoring and tracking techniques such as inter-satellite links, and data processing techniques, the accuracy and real-time performance of satellite ephemerides and clock products are steadily improved. Starting from December 27th, 2018, BeiDou Navigation System 3, or BDS-3 has been providing accurate and reliable basic positioning, navigation, and timing (PNT) services to users in the countries within the “one belt and one road”. This paper summarizes the challenges of precise orbit determination and time synchronization faced and specific solutions sought from the regional BDS-2 system to BDS-3 global system at the control segment. It is interesting to compare BDS with other GNSS systems in terms of technical characteristics. Finally, aiming at higher accuracy and more reliable PNT services, a road map of precise orbit determination and time synchronization technique for next generation navigation systems is discussed, which will lead to better and better global navigation satellite systems. |
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| Keywords: | BeiDou navigation satellite system Orbit determination time synchronization two-way time comparison satellite inter-link |
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