BDS-3/GNSS Undifferenced Pseudorange and Phase Time-Variant Mixed OSB Considering the Receiver Time-Variant Biases and Its Benefit on Multi-Frequency PPP.
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| Title: | BDS-3/GNSS Undifferenced Pseudorange and Phase Time-Variant Mixed OSB Considering the Receiver Time-Variant Biases and Its Benefit on Multi-Frequency PPP. |
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| Authors: | Jiao, Guoqiang1 (AUTHOR) jiaoguoqiang18@mails.ucas.ac.cn, Su, Ke2,3,4 (AUTHOR) hqhu@hgd.edu.cn, Fan, Min1 (AUTHOR) fanmin@bittt.cn, Yang, Yuze5 (AUTHOR) yzyang@shao.ac.cn, Hu, Huaquan2,3 (AUTHOR) |
| Source: | Remote Sensing. Dec2024, Vol. 16 Issue 23, p4433. 22p. |
| Subjects: | Global Positioning System, Phase coding |
| Abstract: | The legacy Global Navigation Satellite System (GNSS) satellite clock offsets obtained by the dual-frequency undifferenced (UD) ionospheric-free (IF) model absorb the code and phase time-variant hardware delays, which leads to the inconsistency of the precise satellite clock estimated by different frequencies. The dissimilarity of the satellite clock offsets generated by different frequencies is called the inter-frequency clock bias (IFCB). Estimates of the IFCB typically employ epoch-differenced (ED) geometry-free ionosphere-free (GFIF) observations from global networks. However, this method has certain theoretical flaws by ignoring the receiver time-variant biases. We proposed a new undifferenced model coupled with satellite clock offsets, and further converted the IFCB into the code and phase time-variant mixed observable-specific signal bias (OSB) to overcome the defects of the traditional model and simplify the bias correction process of multi-frequency precise point positioning (PPP). The new model not only improves the mixed OSB performance, but also avoids the negative impact of the receiver time-variant biases on the satellite mixed OSB estimation. The STD and RMS of the original OSB can be improved by 7.5–60.9% and 9.4–66.1%, and that of ED OSB (it can reflect noise levels) can be improved by 50.0–87.5% and 60.0–88.9%, respectively. Similarly, the corresponding PPP performance for using new mixed OSB is better than that of using the traditional IFCB products. Thus, the proposed pseudorange and phase time-variant mixed OSB concept and the new undifferenced model coupled with satellite clock offsets are reliable, applicable, and effective in multi-frequency PPP. [ABSTRACT FROM AUTHOR] |
| Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
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| Header | DbId: egs DbLabel: Engineering Source An: 181657721 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: BDS-3/GNSS Undifferenced Pseudorange and Phase Time-Variant Mixed OSB Considering the Receiver Time-Variant Biases and Its Benefit on Multi-Frequency PPP. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Jiao%2C+Guoqiang%22">Jiao, Guoqiang</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> jiaoguoqiang18@mails.ucas.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Su%2C+Ke%22">Su, Ke</searchLink><relatesTo>2,3,4</relatesTo> (AUTHOR)<i> hqhu@hgd.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Fan%2C+Min%22">Fan, Min</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> fanmin@bittt.cn</i><br /><searchLink fieldCode="AR" term="%22Yang%2C+Yuze%22">Yang, Yuze</searchLink><relatesTo>5</relatesTo> (AUTHOR)<i> yzyang@shao.ac.cn</i><br /><searchLink fieldCode="AR" term="%22Hu%2C+Huaquan%22">Hu, Huaquan</searchLink><relatesTo>2,3</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Remote+Sensing%22">Remote Sensing</searchLink>. Dec2024, Vol. 16 Issue 23, p4433. 22p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Global+Positioning+System%22">Global Positioning System</searchLink><br /><searchLink fieldCode="DE" term="%22Phase+coding%22">Phase coding</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The legacy Global Navigation Satellite System (GNSS) satellite clock offsets obtained by the dual-frequency undifferenced (UD) ionospheric-free (IF) model absorb the code and phase time-variant hardware delays, which leads to the inconsistency of the precise satellite clock estimated by different frequencies. The dissimilarity of the satellite clock offsets generated by different frequencies is called the inter-frequency clock bias (IFCB). Estimates of the IFCB typically employ epoch-differenced (ED) geometry-free ionosphere-free (GFIF) observations from global networks. However, this method has certain theoretical flaws by ignoring the receiver time-variant biases. We proposed a new undifferenced model coupled with satellite clock offsets, and further converted the IFCB into the code and phase time-variant mixed observable-specific signal bias (OSB) to overcome the defects of the traditional model and simplify the bias correction process of multi-frequency precise point positioning (PPP). The new model not only improves the mixed OSB performance, but also avoids the negative impact of the receiver time-variant biases on the satellite mixed OSB estimation. The STD and RMS of the original OSB can be improved by 7.5–60.9% and 9.4–66.1%, and that of ED OSB (it can reflect noise levels) can be improved by 50.0–87.5% and 60.0–88.9%, respectively. Similarly, the corresponding PPP performance for using new mixed OSB is better than that of using the traditional IFCB products. Thus, the proposed pseudorange and phase time-variant mixed OSB concept and the new undifferenced model coupled with satellite clock offsets are reliable, applicable, and effective in multi-frequency PPP. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Remote Sensing is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.3390/rs16234433 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 4433 Subjects: – SubjectFull: Global Positioning System Type: general – SubjectFull: Phase coding Type: general Titles: – TitleFull: BDS-3/GNSS Undifferenced Pseudorange and Phase Time-Variant Mixed OSB Considering the Receiver Time-Variant Biases and Its Benefit on Multi-Frequency PPP. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Jiao, Guoqiang – PersonEntity: Name: NameFull: Su, Ke – PersonEntity: Name: NameFull: Fan, Min – PersonEntity: Name: NameFull: Yang, Yuze – PersonEntity: Name: NameFull: Hu, Huaquan IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 12 Text: Dec2024 Type: published Y: 2024 Identifiers: – Type: issn-print Value: 20724292 Numbering: – Type: volume Value: 16 – Type: issue Value: 23 Titles: – TitleFull: Remote Sensing Type: main |
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