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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)  

Public [article]  inJournal of geodesy > vol 84 n° 1 (January 2010) . - pp 31 - 50 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 référence Résumé : (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 [article]

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Satellite Laser Ranging biases and terrestrial reference frame scale factor / David Coulot (2009)  

Public contenu dans Observing our changing Earth / Michael G. Sideris (2009)   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 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 référence Résumé : (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

An original approach to compute Satellite Laser Range biases / David Coulot (2008)    

Public contenu dans Proceedings of the 15th international workshop on laser ranging, Canberra, Australia, 15 - 20 October 2006 / J. Luck (2008)   Titre : An original approach to compute Satellite Laser Range biases Type de document : Article/Communication Auteurs : David Coulot , Auteur ; Philippe Berio, Auteur ; Olivier Laurain, Auteur ; D. Féraudy, Auteur ; Pierre Exertier, Auteur Editeur : Griffith (Australie) : EOS Space systems Année de publication : 2008 Conférence : IWLR 2006, 15th international workshop on laser ranging, Extending the range 15/10/2006 20/10/2006 Canberra Australie OA proceedings Importance : pp 110 - 119 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] données TLS (télémétrie) [Termes IGN] erreur systématique [Termes IGN] télémétrie laser sur satellite Résumé : (auteur) Although they are permanently calibrated, the Satellite Laser Ranging (SLR) stations can present residual systematic errors, the well-known “range biases”. These biases must be considered in any SLR data processing. Indeed, they are strongly correlated with the Up component of the station positions. Thus, if they are not computed together with these positions, they can induce jumps in these latter and consequently damage the global scale factor of the underlying Terrestrial Reference Frame with respect to any given reference. On the other hand, estimating range biases together with station positions is not so easy, due to the previously mentioned correlations. In this paper, we describe a new approach to derive range bias values together with station positions: the so-called “temporal de-correlation” approach. This method consists in computing station range biases per satellite over a “long” period of time (determined by instrumental changes) together with weekly station position time series in order to significantly reduce the correlations. Numéro de notice : C2006-032 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : sans En ligne : https://cddis.nasa.gov/lw15/docs/papers/An%20Original%20Approach%20to%20Compute% [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102699

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Analysis 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)    

Public contenu dans Proceedings of the 15th international workshop on laser ranging, Canberra, Australia, 15 - 20 October 2006 / J. Luck (2008)   Titre : Analysis of 13 years (1993-2005) of Satellite Laser Ranging data on the two LAGEOS satellites for Terrestrial Reference Frames and Earth Orientation Parameters Type de document : Article/Communication Auteurs : David Coulot , Auteur ; Philippe Berio, Auteur ; Olivier Laurain, Auteur ; D. Féraudy, Auteur ; Pierre Exertier, Auteur ; Florent Deleflie, Auteur Editeur : Griffith (Australie) : EOS Space systems Année de publication : 2008 Conférence : IWLR 2006, 15th international workshop on laser ranging, Extending the range 15/10/2006 20/10/2006 Canberra Australie OA proceedings Importance : pp 120 - 130 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] analyse diachronique [Termes IGN] données TLS (télémétrie) [Termes IGN] Lageos Résumé : (auteur) The quality presently reached by space-geodetic techniques, regarding precision, accuracy such as spatial and temporal distributions of their measurements, allows us to compute time series of geodetic products. In this context, we have developed a method to compute time series of Earth Orientation Parameters (EOPs) and terrestrial station positions through the analysis of Satellite Laser Ranging (SLR) data. This technique being an important basis for the computation of the International Terrestrial Reference Frame, it is crucial to derive accurate time series with a rigorous approach. Furthermore, this method will be used by the scientific department GEMINI of the Observatoire de la Côte d’Azur when it will become an official ILRS analysis center. These times series are obtained with a good accuracy and a reasonable sampling (1 day for EOPs and 1 week for station positions). This good accuracy is ensured by i) a rigorous weighting of SLR measurements per satellite and per station; ii) a kinematic approach to compute orbital residual errors; iii) a rigorous control of range biases which is detailed in [Coulot et al., 2007]. In this paper, we first present the two aspects i) and ii) of our method. In a second part, we analyze 13 years (1993-2005) of SLR data on both LAGEOS satellites in order to study the Terrestrial Reference Frames and the EOPs so computed. Numéro de notice : C2006-033 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : sans En ligne : https://cddis.nasa.gov/lw15/docs/papers/13%20Years%20of%20SLR%20Data%20on%20the% [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102700

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FTLRS Ajaccio campaigns : operations and positioning analysis over 2002/2005 / F. Pierron (2008)    

Public contenu dans Proceedings of the 15th international workshop on laser ranging, Canberra, Australia, 15 - 20 October 2006 / J. Luck (2008)   Titre : FTLRS Ajaccio campaigns : operations and positioning analysis over 2002/2005 Type de document : Article/Communication Auteurs : F. Pierron, Auteur ; Bachir Gourine, Auteur ; Pierre Exertier, Auteur ; Philippe Berio, Auteur ; Pascal Bonnefond, Auteur ; David Coulot , Auteur Editeur : Griffith (Australie) : EOS Space systems Année de publication : 2008 Conférence : IWLR 2006, 15th international workshop on laser ranging, Extending the range 15/10/2006 20/10/2006 Canberra Australie OA proceedings Importance : pp 167 - 172 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] analyse comparative [Termes IGN] données TLS (télémétrie) [Termes IGN] Station laser ultra-mobile Résumé : (auteur) In the framework of JASON-1 project especially for Cal/Val aspects, FTLRS has been deployed in Ajaccio for a six months campaign in 2005. In the continuation of previous operations on the same site in 2002 the observations programs were carefully tuned to be pertinent on both aspects of scientific goals with new tools to optimize sky coverage for the data and technological issues like maintenance and operational costs. In this paper, we’ll present reports and results concerning station positioning with a very interesting combination of LAGEOS -1, -2, STELLA, and STARLETTE observations and comparison over 2002 and 2005 campaigns. An estimation of final accuracy will be discussed in such experiments of multi occupation site and operational issues will be commented. Numéro de notice : C2006-034 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Poster nature-HAL : Poster-avec-CL DOI : sans En ligne : https://cddis.nasa.gov/lw15/docs/papers/FTLRS%20Ajaccio%20Campaigns,%20Operation [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102702

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peut être téléchargé FTLRS Ajaccio campaigns - pdf éditeur Adobe Acrobat PDF

Least-square mean effect: Application to the analysis of SLR time series / David Coulot (2008)    

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Toward 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)  

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Repères de référence terrestres, rotation de la terre et télémétrie laser sur satellites / David Coulot in Géomatique expert, n° 50 (01/05/2006)

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Effet de moyenne par moindres carrés, application à l'analyse des séries temporelles laser / David Coulot in Bulletin d'information scientifique et technique de l'IGN, n° 75 (mars 2006)

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A first step for the French Geodetic and Fundamental Astronomy Virtual Observatory / Christophe Barache (2006)    

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Global combination from space geodetic techniques / Daniel Gambis (2006) 

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How can combination help to achieve consistency at the 0.1 ppb level? / Zuheir Altamimi (2006)  

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OCA/GEMINI-GRGS becoming an official ILRS analysis center / Florent Deleflie (2006)    

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Positioning of the French Transportable Laser Ranging System (FTLRS) in Corsica over the 2002 and 2005 campaigns / Bachir Gourine (2006)    

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Combination of space geodesy techniques for monitoring the kinematics of the Earth / David Coulot (2005) 

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