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Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks

In the Global Navigation Satellite System (GNSS) community, the Quasi-Zenith Satellite System (QZSS) is an augmentation system for users in the Asia-Pacific region. However, the characteristics and performance of four QZSS satellite clocks in a long-term scale are unknown at present. However, it is...

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Autores principales: Xie, Wei, Huang, Guanwen, Cui, Bobin, Li, Pingli, Cao, Yu, Wang, Haohao, Chen, Zi, Shao, Bo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6928888/
https://www.ncbi.nlm.nih.gov/pubmed/31771314
http://dx.doi.org/10.3390/s19235147
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author Xie, Wei
Huang, Guanwen
Cui, Bobin
Li, Pingli
Cao, Yu
Wang, Haohao
Chen, Zi
Shao, Bo
author_facet Xie, Wei
Huang, Guanwen
Cui, Bobin
Li, Pingli
Cao, Yu
Wang, Haohao
Chen, Zi
Shao, Bo
author_sort Xie, Wei
collection PubMed
description In the Global Navigation Satellite System (GNSS) community, the Quasi-Zenith Satellite System (QZSS) is an augmentation system for users in the Asia-Pacific region. However, the characteristics and performance of four QZSS satellite clocks in a long-term scale are unknown at present. However, it is crucial to the positioning, navigation and timing (PNT) services of users, especially in Asia-Pacific region. In this study, the characteristics and performance variation of four QZSS satellite clocks, which including the phase, frequency, frequency drift, fitting residuals, frequency accuracy, periodic terms, frequency stability and short-term clock prediction, are revealed in detail for the first time based on the precise satellite clock offset products of nearly 1000 days. The important contributions are as follows: (1) It is detected that the times of phase and frequency jump are 2.25 and 1.5 for every QZSS satellite clock in one year. The magnitude of the frequency drift is about 10(−18). The periodic oscillation of frequency drift of J01 and J02 satellite clocks is found. The clock offset model precision of QZSS is 0.33 ns. (2) The two main periods of QZSS satellite clock are 24 and 12 hours, which is the influence of the satellite orbit; (3) The frequency stability of 100, 1000 and 10,000 s are 1.98 × 10(−13), 6.59 × 10(−14) and 5.39 × 10(−14) for QZSS satellite clock, respectively. The visible “bump” is found at about 400 s for J02 and J03 satellite clocks. The short-term clock prediction accuracy of is 0.12 ns. This study provides a reference for the state monitoring and performance variation of the QZSS satellite clock.
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spelling pubmed-69288882019-12-26 Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks Xie, Wei Huang, Guanwen Cui, Bobin Li, Pingli Cao, Yu Wang, Haohao Chen, Zi Shao, Bo Sensors (Basel) Article In the Global Navigation Satellite System (GNSS) community, the Quasi-Zenith Satellite System (QZSS) is an augmentation system for users in the Asia-Pacific region. However, the characteristics and performance of four QZSS satellite clocks in a long-term scale are unknown at present. However, it is crucial to the positioning, navigation and timing (PNT) services of users, especially in Asia-Pacific region. In this study, the characteristics and performance variation of four QZSS satellite clocks, which including the phase, frequency, frequency drift, fitting residuals, frequency accuracy, periodic terms, frequency stability and short-term clock prediction, are revealed in detail for the first time based on the precise satellite clock offset products of nearly 1000 days. The important contributions are as follows: (1) It is detected that the times of phase and frequency jump are 2.25 and 1.5 for every QZSS satellite clock in one year. The magnitude of the frequency drift is about 10(−18). The periodic oscillation of frequency drift of J01 and J02 satellite clocks is found. The clock offset model precision of QZSS is 0.33 ns. (2) The two main periods of QZSS satellite clock are 24 and 12 hours, which is the influence of the satellite orbit; (3) The frequency stability of 100, 1000 and 10,000 s are 1.98 × 10(−13), 6.59 × 10(−14) and 5.39 × 10(−14) for QZSS satellite clock, respectively. The visible “bump” is found at about 400 s for J02 and J03 satellite clocks. The short-term clock prediction accuracy of is 0.12 ns. This study provides a reference for the state monitoring and performance variation of the QZSS satellite clock. MDPI 2019-11-24 /pmc/articles/PMC6928888/ /pubmed/31771314 http://dx.doi.org/10.3390/s19235147 Text en © 2019 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Xie, Wei
Huang, Guanwen
Cui, Bobin
Li, Pingli
Cao, Yu
Wang, Haohao
Chen, Zi
Shao, Bo
Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks
title Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks
title_full Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks
title_fullStr Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks
title_full_unstemmed Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks
title_short Characteristics and Performance Evaluation of QZSS Onboard Satellite Clocks
title_sort characteristics and performance evaluation of qzss onboard satellite clocks
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6928888/
https://www.ncbi.nlm.nih.gov/pubmed/31771314
http://dx.doi.org/10.3390/s19235147
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