A Precise and Stable Space-Based Time System for Navigation in Smart Cities
The high-accuracy and high-stability space-based time system is necessary for satellite navigation systems to achieve high quality of service (QoS) on navigation and positioning in smart city applications. This paper proposes a precise and high-stability space-based time system established under the...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/24/2/480 |
| _version_ | 1797339408804872192 |
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| author | Shaoqian Li Baojun Lin Rui Li Xiaogong Hu Richang Dong |
| author_facet | Shaoqian Li Baojun Lin Rui Li Xiaogong Hu Richang Dong |
| author_sort | Shaoqian Li |
| collection | DOAJ |
| description | The high-accuracy and high-stability space-based time system is necessary for satellite navigation systems to achieve high quality of service (QoS) on navigation and positioning in smart city applications. This paper proposes a precise and high-stability space-based time system established under the autonomous time scale of navigation satellites. The generation, maintenance, and transfer of high-precision space-based time references are researched. A centralized time comparison method based on the ALGOS algorithm conducts the two-way time comparison of the inter-satellite link. Specifically, using the relative clock difference observations of all links between satellites for a certain period of time, the clock difference, clock speed, and clock drift parameters of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>n</mi><mo>−</mo><mn>1</mn></mrow></semantics></math></inline-formula> stars in a constellation of <i>n</i> stars relative to the same reference can be estimated simultaneously. Simulations are conducted on real collected data from the Beidou navigation systems when providing services to smart cities around the world. The simulation results show the high accuracy and stability of the proposed space-based time system under the autonomous time scale reference. Moreover, the clock offset monitoring arc coverage is much higher than the satellite clock offset obtained by the direct observation of the satellite and the anchor station. It proves the efficiency of the proposed space-based time system to be used for satellite clock offset modeling and prediction. |
| first_indexed | 2024-03-08T09:46:32Z |
| format | Article |
| id | doaj.art-5998f0cb5aac475dae1e701505d93c3b |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-08T09:46:32Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-5998f0cb5aac475dae1e701505d93c3b2024-01-29T14:15:11ZengMDPI AGSensors1424-82202024-01-0124248010.3390/s24020480A Precise and Stable Space-Based Time System for Navigation in Smart CitiesShaoqian Li0Baojun Lin1Rui Li2Xiaogong Hu3Richang Dong4Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 101408, ChinaAerospace Information Research Institute, Chinese Academy of Sciences, Beijing 101408, ChinaUniversity of Chinese Academy of Sciences, Beijing 101408, ChinaShanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai 200030, ChinaInnovation Academy for Microsatellites, Chinese Academy of Sciences, Beijing 101408, ChinaThe high-accuracy and high-stability space-based time system is necessary for satellite navigation systems to achieve high quality of service (QoS) on navigation and positioning in smart city applications. This paper proposes a precise and high-stability space-based time system established under the autonomous time scale of navigation satellites. The generation, maintenance, and transfer of high-precision space-based time references are researched. A centralized time comparison method based on the ALGOS algorithm conducts the two-way time comparison of the inter-satellite link. Specifically, using the relative clock difference observations of all links between satellites for a certain period of time, the clock difference, clock speed, and clock drift parameters of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi>n</mi><mo>−</mo><mn>1</mn></mrow></semantics></math></inline-formula> stars in a constellation of <i>n</i> stars relative to the same reference can be estimated simultaneously. Simulations are conducted on real collected data from the Beidou navigation systems when providing services to smart cities around the world. The simulation results show the high accuracy and stability of the proposed space-based time system under the autonomous time scale reference. Moreover, the clock offset monitoring arc coverage is much higher than the satellite clock offset obtained by the direct observation of the satellite and the anchor station. It proves the efficiency of the proposed space-based time system to be used for satellite clock offset modeling and prediction.https://www.mdpi.com/1424-8220/24/2/480satellite navigation systemsmart cityspace-based time systeminter-satellite link |
| spellingShingle | Shaoqian Li Baojun Lin Rui Li Xiaogong Hu Richang Dong A Precise and Stable Space-Based Time System for Navigation in Smart Cities Sensors satellite navigation system smart city space-based time system inter-satellite link |
| title | A Precise and Stable Space-Based Time System for Navigation in Smart Cities |
| title_full | A Precise and Stable Space-Based Time System for Navigation in Smart Cities |
| title_fullStr | A Precise and Stable Space-Based Time System for Navigation in Smart Cities |
| title_full_unstemmed | A Precise and Stable Space-Based Time System for Navigation in Smart Cities |
| title_short | A Precise and Stable Space-Based Time System for Navigation in Smart Cities |
| title_sort | precise and stable space based time system for navigation in smart cities |
| topic | satellite navigation system smart city space-based time system inter-satellite link |
| url | https://www.mdpi.com/1424-8220/24/2/480 |
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