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Comparison of the seasonal displacement parameters estimated in the ITRF2014 processing, what can we learn? / Xavier Collilieux (2018)

Public Titre : Comparison of the seasonal displacement parameters estimated in the ITRF2014 processing, what can we learn? Type de document : Article/Communication Auteurs : Xavier Collilieux , Auteur ; Kristel Chanard , Auteur ; Zuheir Altamimi , Auteur ; Paul Rebischung , Auteur ; Laurent Métivier , Auteur ; Jim Ray, Auteur ; David Coulot , Auteur Editeur : Paris : Committee on Space Research COSPAR Année de publication : 2018 Conférence : COSPAR 2018, 42nd Scientific Assembly of the world Committee on Space Research 14/07/2018 22/07/2018 Pasadena Californie - Etats-Unis OA program & abstracts only Langues : Français (fre) Numéro de notice : C2018-068 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91434

IGS polar motion measurement accuracy / Jim Ray in Geodesy and Geodynamics, vol 8 n° 6 (November 2017)    

Public [article]  inGeodesy and Geodynamics > vol 8 n° 6 (November 2017) . - pp 413 - 420 Titre : IGS polar motion measurement accuracy Type de document : Article/Communication Auteurs : Jim Ray, Auteur ; Paul Rebischung , Auteur ; Jake Griffiths, Auteur Année de publication : 2017 Projets : 1-Pas de projet / Article en page(s) : pp 413 - 420 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] données GPS [Termes IGN] erreur systématique [Termes IGN] International GNSS Service [Termes IGN] mouvement du pôle [Termes IGN] orientation de la Terre [Termes IGN] paramètres d'orientation de la Terre [Termes IGN] précision du positionnement Résumé : (auteur) We elaborate an error budget for the long-term accuracy of IGS (International Global Navigation Satellite System Service) polar motion estimates, concluding that it is probably about 25–30 μas (1-sigma) overall, although it is not possible to quantify possible contributions (mainly annual) that might transfer directly from aliases of subdaily rotational tide errors. The leading sources are biases arising from the need to align daily, observed terrestrial frames, within which the pole coordinates are expressed and which are continuously deforming, to the secular, linear international reference frame. Such biases are largest over spans longer than about a year. Thanks to the very large number of IGS tracking stations, the formal covariance errors are much smaller, around 5 to 10 μas. Large networks also permit the systematic frame-related errors to be more effectively minimized but not eliminated. A number of periodic errors probably also influence polar motion results, mainly at annual, GPS (Global Positioning System) draconitic, and fortnightly periods, but their impact on the overall error budget is unlikely to be significant except possibly for annual tidal aliases. Nevertheless, caution should be exercised in interpreting geophysical excitations near any of the suspect periods. Numéro de notice : A2017-253 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : MATHEMATIQUE/POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.geog.2017.01.008 Date de publication en ligne : 02/03/2017 En ligne : https://doi.org/10.1016/j.geog.2017.01.008 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85261 [article]

Documents numériques

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The IGS contribution to ITRF2014 / Paul Rebischung in Journal of geodesy, vol 90 n° 7 (July 2016)  

Public [article]  inJournal of geodesy > vol 90 n° 7 (July 2016) . - pp 611 – 630 Titre : The IGS contribution to ITRF2014 Type de document : Article/Communication Auteurs : Paul Rebischung , Auteur ; Zuheir Altamimi , Auteur ; Jim Ray, Auteur ; Bruno Garayt , Auteur Année de publication : 2016 Article en page(s) : pp 611 – 630 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] données GNSS [Termes IGN] estimation de précision [Termes IGN] géocentre [Termes IGN] International Terrestrial Reference Frame [Termes IGN] réseau géodésique terrestre Résumé : (auteur) Following the first reprocessing campaign performed by the International GNSS Service (IGS) in 2008, a second reprocessing campaign (repro2) was finalized in 2015. Nine different Analysis Centers (ACs) reanalyzed the history of GNSS data collected by a global tracking network back to 1994 using the latest available models and methodology, and provided daily terrestrial frame solutions among other products. Daily combinations of the AC terrestrial frame solutions provided the IGS input to the next release of the International Terrestrial Reference Frame (ITRF2014). From weighted root mean squares values of the residuals of the daily repro2 combinations, the overall inter-AC level of agreement is assessed to be 1.5 mm for the horizontal components and 4 mm for the vertical component of station positions, 25–40 μas for pole coordinates, 140–200 μas/day for pole rates, 8–20 μs/day for calibrated length-of-day estimates, 4 mm for the X and Y components of geocenter motion, 8 mm for its Z component and 0.5 mm for the terrestrial scale. On the long term, the origins (resp. scales) of the AC terrestrial frames show relative offsets and rates within ±3 mm and ±0.3 mm/year (resp. ±0.5 mm and ±0.05 mm/year). The combination residuals also present AC-specific features, some of which are explained by known analysis specifics, while others remain under investigation. Numéro de notice : A2016-425 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-016-0897-6 Date de publication en ligne : 08/04/2016 En ligne : http://dx.doi.org/10.1007/s00190-016-0897-6 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81319 [article]

Consistent estimates of the dynamic figure parameters of the Earth / Wei Chen in Journal of geodesy, vol 89 n° 2 (February 2015)  

Public [article]  inJournal of geodesy > vol 89 n° 2 (February 2015) . - pp 179 - 188 Titre : Consistent estimates of the dynamic figure parameters of the Earth Type de document : Article/Communication Auteurs : Wei Chen, Auteur ; Jiancheng Li, Auteur ; Jim Ray, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 179 - 188 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] champ de pesanteur terrestre [Termes IGN] ellipsoïde (géodésie) [Termes IGN] figure de la Terre [Termes IGN] masse de la Terre [Termes IGN] moment d'inertie Résumé : (auteur) The Earth’s dynamic figure parameters, namely the principal moments of inertia and dynamic ellipticities of the whole Earth, the fluid outer core and the solid inner core, are fundamental parameters for geodetic, geophysical and astronomical studies. This study aims to re-estimate the mass and the dynamic figure parameters of the Earth on the basis of some global gravity models (EGM2008, EIGEN-6C and EIGEN-6C2) recently released with unprecedented accuracies, as well as an improved value of the gravitational constant G recommended by the Committee on Data for Science and Technology (CODATA). With the potential coefficients of EGM2008, EIGEN-6C and EIGEN-6C2 rescaled to be consistent with the IAU (International Astronomical Union) and IAG (International Association of Geodesy) numerical standards, and other values of relevant parameters also being consistent with those numerical standards, we have obtained consistent estimates of the dynamic figure parameters of the stratified Earth using the theory described in Chen and Shen (J Geophys Res 115:B12419 2010). Our preferred principal moments of inertia for the whole Earth are A=(80,085.1±9.6)×1033 kg m2,B=(80,086.8±9.6)×1033 kg m2, and C=(80,349.0±9.6)×1033 kg m2, respectively, the accuracies being limited by the uncertainties of G and e (dynamic ellipticity of the whole Earth). Numéro de notice : A2015-333 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0768-y Date de publication en ligne : 29/10/2014 En ligne : https://doi.org/10.1007/s00190-014-0768-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76658 [article]

Subseasonal GNSS positioning errors / Jim Ray in Geophysical research letters, vol 40 n° 22 (November 2013)    

Public [article]  inGeophysical research letters > vol 40 n° 22 (November 2013) . - pp 5854 - 5860 Titre : Subseasonal GNSS positioning errors Type de document : Article/Communication Auteurs : Jim Ray, Auteur ; Jake Griffiths, Auteur ; Xavier Collilieux , Auteur ; Paul Rebischung , Auteur Année de publication : 2013 Article en page(s) : pp 5854 - 5860 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] bruit rose [Termes IGN] coordonnées GNSS [Termes IGN] crénelage [Termes IGN] données GLONASS [Termes IGN] élément d'orientation externe [Termes IGN] variation saisonnière [Vedettes matières IGN] Traitement de données GNSS Résumé : (auteur) Global Navigation Satellite System (GNSS) station coordinate errors over seasonal and longer time scales are known to be spatially and temporally correlated with flicker noise spectra. Overlaying this are strong annual and semiannual variations that cannot be explained by any single phenomenon. Next most prominent are harmonics of the GPS draconitic year with periods of (351.4/N) days. One explanation is that errors in the standard model for Earth orientation parameter (EOP) tidal variations near 12 and 24 h periods are absorbed into the resonant GPS orbit and daily EOP estimates, resulting mainly in draconitic and fortnightly alias signatures for 24 h product sampling. With the change in International GNSS Service (IGS) station coordinates from weekly to daily resolution in August 2012, it is now possible to study subseasonal performance. All IGS Analysis Centers (ACs) show fortnightly signals, but the resolution will not be sufficient to distinguish direct from aliased subdaily tidal error sources till two more years of data are available. Nevertheless, aliased errors from the subdaily EOP tide model are expected. All but one of the ACs that includes GLONASS data have signals at ~8 day periods, the ground repeat period for GLONASS orbits. This most likely arises from larger geographically correlated orbit errors for GLONASS. Two ACs possess unique short-period features that appear to be caused by peculiarities of their analysis strategies. Numéro de notice : A2013-795 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1002/2013GL058160 Date de publication en ligne : 08/11/2013 En ligne : http://dx.doi.org/10.1002/2013GL058160 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=80235 [article]

Documents numériques

en open access Subseasonal GNSS Positionning Errors Adobe Acrobat PDF

Dependence of IGS products on the ITRF datum / Jim Ray (2013)  

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Mesurer les avions de Swisstopo, un mandat plutôt inhabituel / Jim Ray in Géomatique suisse, vol 110 n° 11 (01/11/2012)

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Nontidal ocean loading: amplitudes and potential effects in GPS height time series / Tonie M. van Dam in Journal of geodesy, vol 86 n° 11 (November 2012)  

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IGS08 : the IGS realization of ITRF2008 / Paul Rebischung in GPS solutions, vol 16 n° 4 (October 2012)  

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Strategies to mitigate aliasing of loading signals while estimating GPS frame parameters / Xavier Collilieux in Journal of geodesy, vol 86 n° 1 (January 2012)  

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Correction to “Topographically induced height errors in predicted atmospheric loading effects” / Tonie M. van Dam in Journal of geophysical research : Solid Earth, Vol 116 n° B11 (November 2011)  

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Quality assessment of GPS reprocessed terrestrial reference frame / Xavier Collilieux in GPS solutions, vol 15 n° 3 (July 2011)  

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Topographically induced height errors in predicted atmospheric loading effects / Tonie M. van Dam in Journal of geophysical research : Solid Earth, Vol 115 n° B7 (July 2010)    

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Impact of loading effects on determination of the International Terrestrial Reference Frame / Xavier Collilieux in Advances in space research, vol 45 n° 1 ([04/01/2010])  

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Effect of the satellite laser ranging network distribution on geocenter motion estimation / Xavier Collilieux in Journal of geophysical research : Solid Earth, Vol 114 n° B4 (April 2009)    

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