Détail de l'auteur
Auteur David Coulot
Commentaire :
Autorités liées :
idHAL :
david-coulot
idRef :
autre URL :
ORCID :
Scopus :
Publons :
G. Scholar :
|
Documents disponibles écrits par cet auteur (41)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
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])
[article]
Titre : Impact of loading effects on determination of the International Terrestrial Reference Frame Type de document : Article/Communication Auteurs : Xavier Collilieux , Auteur ; Zuheir Altamimi , Auteur ; David Coulot , Auteur ; Tonie M. van Dam, Auteur ; Jim Ray, Auteur Année de publication : 2010 Article en page(s) : pp 144 - 154 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] effet de charge
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] modèle linéaire
[Termes IGN] série temporelleRésumé : (Auteur) The International Terrestrial Reference Frame (ITRF), as a realization of the International Terrestrial Reference System (ITRS), is represented by a set of station positions and linear velocities. They are intended to be used as regularized coordinates to which some corrections should be added to access instantaneous coordinates. The latest ITRS realization is the ITRF2005, which has integrated time series of station positions to form long-term solutions for the four space geodetic techniques. Currently, a purely linear model is used to parameterize station displacements in the estimation process, plus occasional discontinuities in case of earthquakes or equipment changes. However the input data have been derived without applying surface loading models and so surface loading effects are supposed to be embedded in the coordinates as measured quantities. We evaluate the effect of applying a posteriori loading corrections, which include the effect of atmospheric, non-tidal ocean, and continental water loading, to time series of positions estimated from Satellite Laser Ranging (SLR), Very Long Baseline Interferometry (VLBI), and Global Positioning System (GPS) data. We notice that they reduce about 50% or more of the annual signals in the translation and scale parameter time series of the SLR and VLBI techniques, except in SLR Z translation. In general, the estimated secular frame definition is negligibly affected and estimated positions and velocities are not significantly modified for stations that have accumulated a large number of observations. A multi-technique combination of such derived frames allows concluding that, for some cases, loading model corrections might degrade co-located station coordinates almost as much as they benefit them. However, most significant improvement of the estimated secular coordinates is observed for stations with less than 100 estimated positions as demonstrated with a multi-technique combination. Numéro de notice : A2010-640 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2009.08.024 Date de publication en ligne : 01/09/2009 En ligne : https://doi.org/10.1016/j.asr.2009.08.024 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90717
in Advances in space research > vol 45 n° 1 [04/01/2010] . - pp 144 - 154[article]Global optimization of core station networks for space geodesy: application to the referencing of the SLR EOP with respect to ITRF / David Coulot in Journal of geodesy, vol 84 n° 1 (January 2010)
[article]
Titre : Global optimization of core station networks for space geodesy: application to the referencing of the SLR EOP with respect to ITRF Type de document : Article/Communication Auteurs : David Coulot , Auteur ; Arnaud Pollet , Auteur ; Xavier Collilieux , Auteur ; Philippe Berio, Auteur Année de publication : 2010 Article en page(s) : pp 31 - 50 Note générale : Bibliographie Langues : Anglais (eng) 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] optimisation (mathématiques)
[Termes IGN] orientation de la Terre
[Termes IGN] programmation stochastique
[Termes IGN] station de référenceRésumé : (Auteur) We apply global optimization in order to optimize the referencing (and consequently the stability) of the Earth Orientation Parameters (EOP) with respect to ITRF2005. These EOP are derived at a daily sampling from SLR data, simultaneously with weekly station positions. The EOP referencing is carried out with minimum constraints applied weekly to the three rotations and over core station networks. Our approach is based on a multi objective genetic algorithm, a particular stochastic global optimization method, the reference system effects being the objectives to minimize. We thus use rigorous criteria for the optimal weekly core station selection. The results evidence an improvement of 10% of the stability for Polar Motion (PM) series in comparison to the results obtained with the network specially designed for EOP referencing by the Analysis Working Group of the International Laser Ranging Service. This improvement of nearly 25 ?as represents 50% of the current precision of the IERS 05 C04 PM reference series. We also test the possibility of averaging the weekly networks provided by our algorithm (the Genetically Modified Networks—GMN) over the whole time period. Although the dynamical nature of the GMN is clearly a key point of their success, we can derive such a global mean core network, which could be useful for practical applications regarding EOP referencing. Using this latter core network moreover provides more stable EOP series than the conventional network does. Copyright Springer Numéro de notice : A2010-033 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-009-0342-1 En ligne : https://doi.org/10.1007/s00190-009-0342-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30229
in Journal of geodesy > vol 84 n° 1 (January 2010) . - pp 31 - 50[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 266-2010011 SL Revue Centre de documentation Revues en salle Disponible
contenu dans Journées 2010, systèmes de référence spatio-temporels, Paris, 20-22 septembre 2010 / Nicole Capitaine (2010)
Titre : Influence of station referencing on the quality of EOP time series Type de document : Article/Communication Auteurs : David Coulot , Auteur ; Etienne Bernard , Auteur ; Xavier Collilieux , Auteur Editeur : Paris, Meudon et Nançay : Observatoire de Paris Année de publication : 2010 Conférence : JSRST 2010, Journées systèmes de référence spatio-temporels, New challenges for reference systems and numerical standards in astronomy 20/09/2010 22/09/2010 Paris France OA proceedings Importance : p. 163 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] paramètres d'orientation de la Terre
[Termes IGN] série temporelleRésumé : (Auteur) EOP series (at a daily sampling) are computed together with (weekly) station positions. The definition of the terrestrial frames (TF) underlying these position series affects the accuracy of the estimated EOP series. The goal of this work is to evidence this influence for Satellite Laser Ranging (SLR) network, from two points of view. In the first case study, the station referencing is realized through minimum constraints which align the orientation of the weekly TF with respect to a given Terrestrial Reference Frame (TRF). The weekly station networks over which these constraints are applied have a significant influence on the stability of the EOP series. To get the best stability, we thus search for weekly core networks with optimization methods. The WRMS of the so-computed EOP series shows a 25 µas improvement compared to the standard approach recommended by the analysis working group of the International Laser Ranging Service (ILRS). In the second approach, the station referencing with respect to a given TRF is realized through the computation of weekly Helmert transformations. The EOP series consistent with the so-obtained station position series are directly computed by adding the estimated rotations. The results provided by an optimization (on the basis of a stochastic algorithm) of this approach will be compared to the results above. Numéro de notice : C2010-055 Affiliation des auteurs : LAREG (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésNat DOI : sans En ligne : https://syrte.obspm.fr/jsr/journees2010/pdf/Coulot.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101416
Titre : Satellite Laser Ranging biases and terrestrial reference frame scale factor Type de document : Article/Communication Auteurs : David Coulot , Auteur ; Philippe Berio, Auteur ; Pascal Bonnefond, Auteur ; Pierre Exertier, Auteur ; D. Féraudy, Auteur ; Olivier Laurain, Auteur ; Florent Deleflie, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2009 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 133 Conférence : IAG 2007, International Association of Geodesy General Assembly 20/09/2010 22/09/2010 Perugia Italie Proceedings Springer Importance : pp 39 - 46 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] données TLS (télémétrie)
[Termes IGN] erreur systématique
[Termes IGN] facteur d'échelle
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] repère de référenceRésumé : (auteur) We examine the impact of the strategy adopted regarding range biases on Satellite Laser Ranging data processing results. More especially, we test the stability of the weekly Terrestrial Reference Frame scale factors computed w.r.t. ITRF2000 according to the two different strategies which are studied in this paper. In the first approach, range biases are not considered in the data processing. In the second approach, we use a temporal de-correlation method to rigorously estimate all station range biases. The first approach provides weekly scale factors with a piece-wise behavior. More precisely, the time series exhibit a drift of − 2.5 ± 0.2 mm/yr between 2001.0 and 2006.0 and provide a RMS of 5.2 mm. The second approach, which makes the most physical sense, really provides regular weekly scale factors. Indeed, between 2001.0 and 2006.0, these series exhibit a drift of − 0.7 ± 0.2 mm/yr and the RMS of the whole time series is 3.7 mm. Moreover, less discontinuities are detected in the station position residual time series provided by the second approach than in those produced with the first approach. Numéro de notice : C2009-029 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-540-85426-5_5 En ligne : https://doi.org/10.1007/978-3-540-85426-5_5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90692 Corsica SLR positioning campaigns (2002 and 2005) for satellite altimeter calibration missions / Bachir Gourine in Marine geodesy, vol 31 n° 2 (June - September 2008)
[article]
Titre : Corsica SLR positioning campaigns (2002 and 2005) for satellite altimeter calibration missions Type de document : Article/Communication Auteurs : Bachir Gourine, Auteur ; Pierre Exertier, Auteur ; David Coulot , Auteur ; Salem Kahlouche, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 103 - 116 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] altimètre laser
[Termes IGN] campagne d'observations
[Termes IGN] Corse
[Termes IGN] étalonnage d'instrument
[Termes IGN] orbitographie
[Termes IGN] positionnement par géodésie spatiale
[Termes IGN] télémétrie laser sur satelliteRésumé : (Auteur) The French Transportable Laser Ranging System (FTLRS) was deployed in the calibration site of satellite radar altimeters in Corsica over the 2002 and 2005 campaigns. The paper describes the different steps of SLR data processing. The average arcs RMS obtained are about 1-2 cm for Lageos-1&-2, Starlette and Stella satellites; it is shown that the best results of satellite orbits determination and geocentric positioning are obtained with Eigen-Grace03s gravity model. The difference of FTLRS absolute 3D positioning, between 2002 and 2005, of about 7.7 mm (i.e., 2.6 mm/yr) is less than residual errors of ITRF2005 velocities (of about 4.3 mm/yr). Numéro de notice : A2008-496 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/01490410802053658 En ligne : https://doi.org/10.1080/01490410802053658 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29565
in Marine geodesy > vol 31 n° 2 (June - September 2008) . - pp 103 - 116[article]Réservation
Réserver ce documentExemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 230-08021 RAB Revue Centre de documentation En réserve L003 Disponible PermalinkAnalysis of 13 years (1993-2005) of Satellite Laser Ranging data on the two LAGEOS satellites for Terrestrial Reference Frames and Earth Orientation Parameters / David Coulot (2008)PermalinkPermalinkIERS annual report 2007, 3.6.2.8. Combination Research Centres - Institut Géographique National (IGN) / Xavier Collilieux (2008)PermalinkPermalinkPermalinkThe virtual observatory in geodesy and Earth's sciences: The French activities / Florent Deleflie (2008)PermalinkComparison of very long baseline interferometry, GPS, and satellite laser ranging height residuals from ITRF2005 using spectral and correlation methods / Xavier Collilieux in Journal of geophysical research : Solid Earth, vol 112 n° B12 (December 2007)PermalinkToward a direct combination of space-geodetic techniques at the measurement level: Methodology and main issues / David Coulot in Journal of geophysical research : Solid Earth, vol 112 n° B5 (May 2007)PermalinkGeocentre motion measured with DORIS and SLR, and predicted by geophysical models / Martine Feissel-Vernier in Journal of geodesy, vol 80 n° 8-11 (November 2006)Permalink
then researcher, responsible for research in Spatial geodesy inside UMR IPGP, geodesy team