Descripteur
Termes IGN > sciences naturelles > sciences de la Terre et de l'univers > géosciences > géophysique interne > géodésie > géodésie physique > orientation de la Terre
orientation de la TerreVoir aussi |
Documents disponibles dans cette catégorie (359)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Robust determination of station positions and Earth orientation parameters by VLBI intra-technique combination / S. Böckmann (2012)
Titre : Robust determination of station positions and Earth orientation parameters by VLBI intra-technique combination Type de document : Thèse/HDR Auteurs : S. Böckmann, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2012 Collection : DGK - C Sous-collection : Dissertationen num. 684 Importance : 70 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5096-9 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse combinatoire (maths)
[Termes IGN] données ITGB
[Termes IGN] interférométrie à très grande base
[Termes IGN] méthode robuste
[Termes IGN] orientation de la Terre
[Termes IGN] valeur aberranteRésumé : (Auteur) In this thesis, it is shown that combining contributions of different VLBI analysis centers, a so called intra-technique combination, improves the robustness and stability of the final VLBI results. For this purpose, a refined combination method has been developed which is in many theoretical and practical aspects superior to combination approaches currently used for comparable geodetic combination tasks. For example, datum-free normal equation systems are used as input, which ensure that the contributions are not deformed by any constraints at all, and the same underlying terrestrial reference frame can be applied during the combination process. Furthermore, a statistically rigorous variance component estimation approach for the relative weighting of the contributions is used. The combination process implies detailed comparisons and analyses of the individual ACs' contributions. From these, as one of the outcomes of this thesis, several systematic differences between the individual contributions were detected and eliminated. The adherence to standards was considerably improved. The combination process itself reduces the "analyst's noise" and damps the impact of outliers. Validations with independent results of other space-geodetic techniques confirm a benefit of up to 15% more accurate results than from individual solutions. Another aspect of this thesis is the general problem of any intra-technique combination, the correlations between the individual contributions. So far, the contributions of different ACs are always treated as independent data sets, although they have been derived from virtually the same set of original observations. It is shown that correlations between the individual ACs' contributions can be determined and rigorously taken in account during the combination process if the combination is performed directly on the level of the observation equations, instead on the level of normal equation systems. The main effect of considering these correlations is that the formal errors of the estimated combined parameters are considerably more realistic, but the parameters as such remain unchanged within their formal errors. Numéro de notice : 14620 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : sans En ligne : https://nbn-resolving.org/urn:nbn:de:hbz:5N-23152 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62671
Titre : Towards a combination of space-geodetic measurements Type de document : Article/Communication Auteurs : Arnaud Pollet , Auteur ; David Coulot , Auteur ; Nicole Capitaine, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2012 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 136 Conférence : IAG 2009 Symposium, Geodesy for Planet Earth 31/08/2009 04/09/2009 Buenos Aires Argentine Proceedings Springer Importance : pp 51 - 57 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] cohérence des données
[Termes IGN] coordonnées GPS
[Termes IGN] données DORIS
[Termes IGN] données ITGB
[Termes IGN] données TLS (télémétrie)
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] paramètres d'orientation de la Terre
[Termes IGN] repère de référence céleste international
[Termes IGN] série temporelle
[Termes IGN] transformation de coordonnéesRésumé : (auteur) The International Terrestrial Reference Frame (ITRF), the Earth Orientation Parameter (EOP) time series, and the International Celestial Reference Frame are obtained separately and may thus present inconsistencies. To solve this problem, a first step has been made with the latest ITRF realization (ITRF2005), which has been computed, for the first time, with consistent EOP time series. Another approach to better understand this issue is to directly estimate, in the same process, station positions and EOP time series, from all the space-geodetic measurements. In the framework of the French Groupe de Recherche de Géodésie Spatiale (GRGS) activities, this latter approach has been studied for several years. For this purpose, the observations of VLBI, SLR, GPS, and DORIS techniques are combined using the same models and software for all the individual data processing. In this paper, we study methodological issues regarding the definition and the consistency of the weekly combined terrestrial frames. Numéro de notice : C2009-042 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-20338-1_7 Date de publication en ligne : 26/07/2011 En ligne : https://doi.org/10.1007/978-3-642-20338-1_7 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91641 ITRF2008: an improved solution of the international terrestrial reference frame / Zuheir Altamimi in Journal of geodesy, vol 85 n° 8 (August 2011)
[article]
Titre : ITRF2008: an improved solution of the international terrestrial reference frame Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur ; Laurent Métivier , Auteur Année de publication : 2011 Projets : 1-Pas de projet / Article en page(s) : pp 457 - 473 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] exactitude des données
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] rotation de la Terre
[Termes IGN] série temporelle
[Termes IGN] système de référence mondial
[Termes IGN] télémétrie laser sur satelliteRésumé : (Auteur) ITRF2008 is a refined version of the International Terrestrial Reference Frame based on reprocessed solutions of the four space geodetic techniques: VLBI, SLR, GPS and DORIS, spanning 29, 26, 12.5 and 16 years of observations, respectively. The input data used in its elaboration are time series (weekly from satellite techniques and 24-h session-wise from VLBI) of station positions and daily Earth Orientation Parameters (EOPs). The ITRF2008 origin is defined in such a way that it has zero translations and translation rates with respect to the mean Earth center of mass, averaged by the SLR time series. Its scale is defined by nullifying the scale factor and its rate with respect to the mean of VLBI and SLR long-term solutions as obtained by stacking their respective time series. The scale agreement between these two technique solutions is estimated to be 1.05 + 0.13 ppb at epoch 2005.0 and 0.049 + 0.010 ppb/yr. The ITRF2008 orientation (at epoch 2005.0) and its rate are aligned to the ITRF2005 using 179 stations of high geodetic quality. An estimate of the origin components from ITRF2008 to ITRF2005 (both origins are defined by SLR) indicates differences at epoch 2005.0, namely: -0.5, -0.9 and -4.7 mm along X, Y and Z-axis, respectively. The translation rate differences between the two frames are zero for Y and Z, while we observe an X-translation rate of 0.3 mm/yr. The estimated formal errors of these parameters are 0.2 mm and 0.2 mm/yr, respectively. The high level of origin agreement between ITRF2008 and ITRF2005 is an indication of an imprecise ITRF2000 origin that exhibits a Z-translation drift of 1.8 mm/yr with respect to ITRF2005. An evaluation of the ITRF2008 origin accuracy based on the level of its agreement with ITRF2005 is believed to be at the level of 1 cm over the time-span of the SLR observations. Considering the level of scale consistency between VLBI and SLR, the ITRF2008 scale accuracy is evaluated to be at the level of 1.2 ppb (8 mm at the equator) over the common time-span of the observations of both techniques. Although the performance of the ITRF2008 is demonstrated to be higher than ITRF2005, future ITRF improvement resides in improving the consistency between local ties in co-location sites and space geodesy estimates. Numéro de notice : A2011-356 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0444-4 Date de publication en ligne : 03/02/2011 En ligne : https://doi.org/10.1007/s00190-011-0444-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31135
in Journal of geodesy > vol 85 n° 8 (August 2011) . - pp 457 - 473[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 266-2011081 RAB Revue Centre de documentation En réserve L003 Disponible Documents numériques
en open access
ITRF2008: an improved solution ... - pdf éditeurAdobe Acrobat PDF High-resolution atmospheric angular momentum functions related to Earth rotation parameters during CONT08 / Daniel Gambis in Journal of geodesy, vol 85 n° 7 (July 2011)
[article]
Titre : High-resolution atmospheric angular momentum functions related to Earth rotation parameters during CONT08 Type de document : Article/Communication Auteurs : Daniel Gambis, Auteur ; David A. Salstein, Auteur ; S. Lambert, Auteur Année de publication : 2011 Article en page(s) : pp 435 - 441 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse comparative
[Termes IGN] données GPS
[Termes IGN] données ITGB
[Termes IGN] moment cinétique atmosphérique
[Termes IGN] rotation de la TerreRésumé : (Auteur) Due to the temporal resolution of available numerical weather analyses, the effect of the atmosphere on Earth rotation at daily and sub-daily periods is usually investigated using 6-hourly atmospheric angular momentum (AAM) functions. During the period of CONT08, however, atmospheric analysis data were provided by the European Centre for Medium-Range Weather Forecasts (ECMWF) also on an hourly basis. In this paper, we, therefore, determine two sets of AAM functions from ECMWF data—one for CONT08 with hourly resolution and one for the year 2008 with 6-hourly resolution. The comparisons of the AAM functions to high-resolution Earth rotation parameters (ERP) from VLBI and GPS observations are carried out in the frequency domain. Special attention is paid to the preparation of the high-resolution data sets for the geodetic purposes, as there are jump discontinuities at 12 h intervals. Hence, the hourly AAM functions need to be concatenated. The revised functions yield much smaller amplitudes than their 6-hourly counterparts, as can be seen from the equatorial and the axial frequency spectra of atmospheric excitation in Earth rotation. This decrease of spectral power in the hourly AAM functions is found to be associated with a strong counteraction of pressure and wind terms, which originates from atmospheric circulation on short time scales. The results are compared to previous findings published by Brzezin'ski and Petrov (IERS Tech Note 28:53–60, 2000) based on the data from the U.S. National Centers for Environmental Prediction (NCEP). Numéro de notice : A2011-332 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-011-0458-y Date de publication en ligne : 27/04/2011 En ligne : https://doi.org/10.1007/s00190-011-0458-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31111
in Journal of geodesy > vol 85 n° 7 (July 2011) . - pp 435 - 441[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 266-2011071 RAB Revue Centre de documentation En réserve L003 Disponible Application des algorithmes génétiques à la recherche de sous-réseaux de stations de télémétrie laser / David Coulot in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)
[article]
Titre : Application des algorithmes génétiques à la recherche de sous-réseaux de stations de télémétrie laser Type de document : Article/Communication Auteurs : David Coulot , Auteur ; Xavier Collilieux , Auteur ; Arnaud Pollet , Auteur Année de publication : 2011 Article en page(s) : pp 89 - 93 Note générale : Bibliographie Langues : Français (fre) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] algorithme génétique
[Termes IGN] données TLS (télémétrie)
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orientation de la Terre
[Termes IGN] repère de référence
[Termes IGN] réseau géodésique terrestreRésumé : (Auteur) [introduction] [...] Dans cet article, nous montrons que la façon dont les EOP (Earth Orientation Parameters) sont mis en référence, sur une longue période de temps, a également une influence significative sur la qualité des séries temporelles de référence des EOP. Cette démonstration est effectuée sur la base d'une solution issue de traitements de données de télémétrie laser sur satellites (SLR, pour Satellite laser ranging). Numéro de notice : A2011-147 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtSansCL DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30926
in Bulletin d'information scientifique et technique de l'IGN > n° 77 (avril 2011) . - pp 89 - 93[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 015-2011011 RAB Revue Centre de documentation En réserve L003 Disponible Documents numériques
peut être téléchargé
Application_des_algorithmes_genetiques_CoulotAdobe Acrobat PDF Résultats récents du centre français GRGS d'analyse de données de télémétrie laser sur satellites / Florent Deleflie in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)PermalinkPermalinkPermalinkIntroduction à l’astronomie de position / Jonathan Chenal (2011)PermalinkPermalinkIDS contribution to ITRF2008 / Jean-Jacques Valette in Advances in space research, vol 46 n° 12 (15/12/2010)PermalinkRefining DORIS atmospheric drag estimation in preparation of ITRF2008 / Marie-Line Gobinddass in Advances in space research, vol 46 n° 12 (15/12/2010)PermalinkContributions of the French Institut Géographique National (IGN) to the International DORIS Service / Pascal Willis in Advances in space research, vol 45 n° 12 (15/06/2010)PermalinkGSFC DORIS contribution to ITRF2008 / Karine Le Bail in Advances in space research, vol 45 n° 12 (15/06/2010)PermalinkMantle dynamics, geoid, inertia and TPW since 120 Myr / Hélène Rouby in Earth and planetary science letters, vol 292 n° 3-4 (April 2010)Permalink