On the precision and accuracy of IGS orbits.
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| Title: | On the precision and accuracy of IGS orbits. |
|---|---|
| Authors: | Griffiths, Jake1 jake.griffiths@noaa.gov, Ray, Jim1 jim.ray@noaa.gov |
| Source: | Journal of Geodesy. Mar2009, Vol. 83 Issue 3, p277-287. 11p. |
| Subjects: | Global Positioning System, Prediction models, Data analysis, Orbits of artificial satellites, Coordinates, Estimates, Mathematical models, Rotation of the earth, Earth (Planet) |
| Abstract: | In order to explore the precision and accuracy of International GNSS Service (IGS) orbits, we difference geocentric satellite positions midway between successive daily Final orbits for the period starting 5 November 2006, when the IGS switched its method of antenna calibration, through 31 December 2007. This yields a time series of orbit repeatabilities analogous to the classical geodetic test for position determinations. If we compare our average positional discontinuities to the official IGS accuracy codes, root-sum-squared (RSS) for each pair of days, we find the discontinuities are not well correlated with the predicted performance values. If instead the IGS weighted root-mean-square (WRMS) values from the Final combination long-arc analyses are taken as the measure of IGS accuracy, we find the position differences and long-arc values are correlated, but the long-arc values are exaggerated, particularly around eclipses, despite the fact that our day-boundary position differences apply to a single epoch each day and the long-arc analyses consider variations over a week. Our method is not well suited to probe the extent to which systematic effects dominate over random orbit errors, as indicated by satellite laser ranging residuals, but eclipsing satellites often display the most problematic behavior. A better metric than the current IGS orbit accuracy codes would probably be one based on the orbit discontinuities between successive days. [ABSTRACT FROM AUTHOR] |
| Copyright of Journal of Geodesy is the property of Springer Nature 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.) | |
| Database: | Engineering Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 52198619 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: On the precision and accuracy of IGS orbits. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Griffiths%2C+Jake%22">Griffiths, Jake</searchLink><relatesTo>1</relatesTo><i> jake.griffiths@noaa.gov</i><br /><searchLink fieldCode="AR" term="%22Ray%2C+Jim%22">Ray, Jim</searchLink><relatesTo>1</relatesTo><i> jim.ray@noaa.gov</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Journal+of+Geodesy%22">Journal of Geodesy</searchLink>. Mar2009, Vol. 83 Issue 3, p277-287. 11p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Global+Positioning+System%22">Global Positioning System</searchLink><br /><searchLink fieldCode="DE" term="%22Prediction+models%22">Prediction models</searchLink><br /><searchLink fieldCode="DE" term="%22Data+analysis%22">Data analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Orbits+of+artificial+satellites%22">Orbits of artificial satellites</searchLink><br /><searchLink fieldCode="DE" term="%22Coordinates%22">Coordinates</searchLink><br /><searchLink fieldCode="DE" term="%22Estimates%22">Estimates</searchLink><br /><searchLink fieldCode="DE" term="%22Mathematical+models%22">Mathematical models</searchLink><br /><searchLink fieldCode="DE" term="%22Rotation+of+the+earth%22">Rotation of the earth</searchLink><br /><searchLink fieldCode="DE" term="%22Earth+%28Planet%29%22">Earth (Planet)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: In order to explore the precision and accuracy of International GNSS Service (IGS) orbits, we difference geocentric satellite positions midway between successive daily Final orbits for the period starting 5 November 2006, when the IGS switched its method of antenna calibration, through 31 December 2007. This yields a time series of orbit repeatabilities analogous to the classical geodetic test for position determinations. If we compare our average positional discontinuities to the official IGS accuracy codes, root-sum-squared (RSS) for each pair of days, we find the discontinuities are not well correlated with the predicted performance values. If instead the IGS weighted root-mean-square (WRMS) values from the Final combination long-arc analyses are taken as the measure of IGS accuracy, we find the position differences and long-arc values are correlated, but the long-arc values are exaggerated, particularly around eclipses, despite the fact that our day-boundary position differences apply to a single epoch each day and the long-arc analyses consider variations over a week. Our method is not well suited to probe the extent to which systematic effects dominate over random orbit errors, as indicated by satellite laser ranging residuals, but eclipsing satellites often display the most problematic behavior. A better metric than the current IGS orbit accuracy codes would probably be one based on the orbit discontinuities between successive days. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Journal of Geodesy is the property of Springer Nature 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.) |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=52198619 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00190-008-0237-6 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 11 StartPage: 277 Subjects: – SubjectFull: Global Positioning System Type: general – SubjectFull: Prediction models Type: general – SubjectFull: Data analysis Type: general – SubjectFull: Orbits of artificial satellites Type: general – SubjectFull: Coordinates Type: general – SubjectFull: Estimates Type: general – SubjectFull: Mathematical models Type: general – SubjectFull: Rotation of the earth Type: general – SubjectFull: Earth (Planet) Type: general Titles: – TitleFull: On the precision and accuracy of IGS orbits. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Griffiths, Jake – PersonEntity: Name: NameFull: Ray, Jim IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 03 Text: Mar2009 Type: published Y: 2009 Identifiers: – Type: issn-print Value: 09497714 Numbering: – Type: volume Value: 83 – Type: issue Value: 3 Titles: – TitleFull: Journal of Geodesy Type: main |
| ResultId | 1 |
