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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...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2019
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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. |
format | Online Article Text |
id | pubmed-6928888 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
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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