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The International DORIS Service (IDS) : Recent developments in preparation for ITRF2013 / Pascal Willis (2016)  

Public contenu dans IAG 150 Years / Chris Rizos (2016)   Titre : The International DORIS Service (IDS) : Recent developments in preparation for ITRF2013 Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Franck G. Lemoine, Auteur ; Guilhem Moreaux, Auteur ; Laurent Soudarin, Auteur ; Pascale Ferrage, Auteur ; J.C. Ries, Auteur ; Michiel Otten, Auteur ; Jérôme Saunier , Auteur ; Carey E. Noll, Auteur ; Richard Biancale, Auteur ; Brian Luzum, Auteur Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2016 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 143 Conférence : IAG 2013, Scientific assembly, IAG 150 Years Postdam Allemagne Proceedings Springer Importance : pp 631 - 640 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] données Jason [Termes IGN] International DORIS Service [Termes IGN] International Terrestrial Reference Frame [Termes IGN] Jason [Termes IGN] mouvement du pôle Résumé : (auteur) The International DORIS Service (IDS) was created in 2003 under the umbrella of the International Association of Geodesy (IAG) to foster scientific research related to the French DORIS tracking system and to deliver scientific products, mostly related to the International Earth rotation and Reference systems Service (IERS). We first present some general background related to the DORIS system (current and planned satellites, current tracking network and expected evolution) and to the general IDS organization (from Data Centers, Analysis Centers and Combination Center). Then, we discuss some of the steps recently taken to prepare the IDS submission to ITRF2013 (combined weekly time series based on individual solutions from several Analysis Centers). In particular, recent results obtained from the Analysis Centers and the Combination Center show that improvements can still be made when updating physical models of some DORIS satellites, such as Envisat, Cryosat-2 or Jason-2. The DORIS contribution to ITRF2013 should also benefit from the larger number of ground observations collected by the last generation of DGXX receivers (first instrument being onboard Jason-2 satellite). In particular for polar motion, sub-milliarcsecond accuracy seems now to be achievable. Weekly station positioning internal consistency also seems to be improved with a larger DORIS constellation. Numéro de notice : C2013-051 Affiliation des auteurs : LASTIG LAREG+Ext (2012-mi2018) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/1345_2015_164 Date de publication en ligne : 13/08/2015 En ligne : http://dx.doi.org/10.1007/1345_2015_164 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78595

Analysis of the DORIS contributions to ITRF2008 / Detlef Angermann in Advances in space research, vol 46 n° 12 (15/12/2010)  

Public [article]  inAdvances in space research > vol 46 n° 12 (15/12/2010) . - pp 1633 - 1647 Titre : Analysis of the DORIS contributions to ITRF2008 Type de document : Article/Communication Auteurs : Detlef Angermann, Auteur ; Manuela Seitz, Auteur ; Hermann Drewes, Auteur Année de publication : 2010 Article en page(s) : pp 1633 - 1647 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] données DORIS [Termes IGN] International DORIS Service [Termes IGN] International Terrestrial Reference Frame [Termes IGN] positionnement par DORIS [Termes IGN] série temporelle [Termes IGN] station DORIS Résumé : (Auteur) In its function as an ITRS Combination Centre, DGFI is in charge with the computation of an ITRF2008 solution. The computation methodology of DGFI is based on the combination of datum-free normal equations (weekly or session data sets, respectively) of station positions and Earth orientation parameters (EOP) from the geodetic space techniques DORIS, GPS, SLR and VLBI. In this paper we focus on the DORIS part within the ITRF2008 computations. We present results obtained from the analysis of the DORIS time series for station positions, network translation and scale parameters, as well as for the terrestrial pole coordinates. The submissions to ITRF2008 benefit from improved analysis strategies of the seven contributing IDS analysis centres and from a combination of the weekly solutions of station positions and polar motion. The results show an improvement by a factor of two compared to past DORIS data submitted to ITRF2005, which has been evaluated by investigating the repeatabilities of position time series. The DORIS position time series were analysed w.r.t. discontinuities and other non-linear effects such as seasonal variations. About 40 discontinuities have been identified which have been compared with the results of an earlier study. Within the inter-technique combination we focus on the DORIS contribution to the integration of the different space geodetic observations and on a comparison of the geodetic local ties with the space geodetic solutions. Results are given for the 41 co-location sites between DORIS and GPS. Numéro de notice : A2010-567 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.07.018 En ligne : https://doi.org/10.1016/j.asr.2010.07.018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30759 [article]

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DORIS system: the new age / Albert Auriol in Advances in space research, vol 46 n° 12 (15/12/2010)  

Public [article]  inAdvances in space research > vol 46 n° 12 (15/12/2010) . - pp 1484 - 1496 Titre : DORIS system: the new age Type de document : Article/Communication Auteurs : Albert Auriol, Auteur ; Cédric Tourain, Auteur Année de publication : 2010 Article en page(s) : pp 1484 - 1496 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] balise DORIS [Termes IGN] DORIS [Termes IGN] instrument embarqué [Termes IGN] International DORIS Service [Termes IGN] Jason [Termes IGN] mesurage de phase [Termes IGN] mesurage de pseudo-distance [Termes IGN] orbite précise [Termes IGN] orbitographie Résumé : (Auteur) The boarding of the first DGXX DORIS instrument on Jason-2 mission gives us the opportunity to present the improvements that have been implemented on the DORIS system. The goal of this paper is to present information about the new capacities of the DORIS system and to give the current status of its components. An overview of the DORIS system, the International DORIS Service and the Jason-2 satellite mission are first presented. Then the new characteristics of the on-board instrument are detailed. The capacity to track up to seven ground beacons simultaneously dramatically increases the number of measurements performed: a factor of three increase over Jason-1 is observed at the altitude of 1330 km. It also increases the diversity of directions of observation and allows low elevation measurements from 0°. The new phase measurements capability allows now phase processing. The instability of the Jason-1 USOs (Ultra-Stable Oven-controlled quartz oscillator) while crossing the South Atlantic Anomaly has been solved by decreasing the sensitivity to radiation by a factor of 10. New features of the on-board software enhance the coastal and inland water altimetry and increase the robustness of the data. The new software also improves the real time orbit accuracy for operational altimetry. The improvements introduced concurrently on the ground segment have also significantly enhanced capability. The new RINEX exchange formats provide simultaneous phase and pseudo-range measurements. The maintenance of the DORIS Beacons Network and the work done by the DORIS Signal Integrity monitoring team lead to an increased availability of the Network from 75% to 90% and so to a more homogenous orbit coverage. All these improvements including the lessons learned during the past 20 years of operations have pushed the DORIS system forward to a New Age. Numéro de notice : A2010-562 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.05.015 En ligne : https://doi.org/10.1016/j.asr.2010.05.015 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30754 [article]

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IDS contribution to ITRF2008 / Jean-Jacques Valette in Advances in space research, vol 46 n° 12 (15/12/2010)  

Public [article]  inAdvances in space research > vol 46 n° 12 (15/12/2010) . - pp 1614 - 1632 Titre : IDS contribution to ITRF2008 Type de document : Article/Communication Auteurs : Jean-Jacques Valette, Auteur ; Franck G. Lemoine, Auteur ; Pascale Ferrage, Auteur ; Philippe Yaya, Auteur ; Zuheir Altamimi , Auteur ; Pascal Willis , Auteur ; Laurent Soudarin, Auteur Année de publication : 2010 Article en page(s) : pp 1614 - 1632 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] analyse diachronique [Termes IGN] correction troposphérique [Termes IGN] données DORIS [Termes IGN] DORIS [Termes IGN] géocentre [Termes IGN] International DORIS Service [Termes IGN] International Terrestrial Reference Frame [Termes IGN] modèle de géopotentiel [Termes IGN] orbitographie [Termes IGN] orientation de la Terre Résumé : (Auteur) For the first time, the International DORIS Service (IDS) has produced a technique level combination based on the contributions of seven analysis centers (ACs), including the European Space Operations Center (ESOC), Geodetic Observatory Pecny (GOP), Geoscience Australia (GAU), the NASA Goddard Space Flight Center (GSFC), the Institut Géographique National (IGN), the Institute of Astronomy, Russian Academy of Sciences (INASAN, named as INA), and CNES/CLS (named as LCA). The ACs used five different software packages to process the DORIS data from 1992 to 2008, including NAPEOS (ESA), Bernese (GOP), GEODYN (GAU, GSC), GIPSY/OASIS (INA), and GINS (LCA). The data from seven DORIS satellites, TOPEX/Poseidon, SPOT-2, SPOT-3, SPOT-4, SPOT-5, Envisat and Jason-1 were processed and all the analysis centers produced weekly SINEX files in either variance–covariance or normal equation format. The processing by the analysis centers used the latest GRACE-derived gravity models, forward modelling of atmospheric gravity, updates to the radiation pressure modelling to improve the DORIS geocenter solutions, denser parameterization of empirically determined drag coefficients to improve station and EOP solutions, especially near the solar maximum in 2001–2002, updated troposphere mapping functions, and an ITRF2005-derived station set for orbit determination, DPOD2005. The CATREF software was used to process the weekly AC solutions, and produce three iterations of an IDS global weekly combination. Between the development of the initial solution IDS-1, and the final solution, IDS-3, the ACs improved their analysis strategies and submitted updated solutions to eliminate troposphere-derived biases in the solution scale, to reduce drag-related degradations in station positioning, and to refine the estimation strategy to improve the combination geocenter solution. An analysis of the frequency content of the individual AC geocenter and scale solutions was used as the basis to define the scale and geocenter of the IDS-3 combination. The final IDS-3 combination has an internal position consistency (WRMS) that is 15 to 20 mm before 2002 and 8 to 10 mm after 2002, when 4 or 5 satellites contribute to the weekly solutions. The final IDS-3 combination includes solutions for 130 DORIS stations on 67 different sites of which 35 have occupations over 16 years (1993.0–2009.0). The EOPs from the IDS-3 combination were compared with the IERS 05 C04 time series and the RMS agreement was 0.24 mas and 0.35 mas for the X and Y components of polar motion. The comparison to ITRF2005 in station position shows an agreement of 6 to 8 mm RMS in horizontal and 10.3 mm in height. The RMS comparison to ITRF2005 in station velocity is at 1.8 mm/year on the East component, to 1.2 mm/year in North component and 1.6 mm/year in height. Numéro de notice : A2010-566 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2010.05.029 Date de publication en ligne : 02/06/2010 En ligne : https://doi.org/10.1016/j.asr.2010.05.029 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30758 [article]

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Contributions 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)  

Public [article]  inAdvances in space research > vol 45 n° 12 (15/06/2010) . - pp 1470 - 1480 Titre : Contributions of the French Institut Géographique National (IGN) to the International DORIS Service Type de document : Article/Communication Auteurs : Pascal Willis , Auteur ; Claude Boucher , Auteur ; Hervé Fagard, Auteur ; Bruno Garayt , Auteur ; Marie-Line Gobinddass , Auteur Année de publication : 2010 Article en page(s) : pp 1470 - 1480 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] données DORIS [Termes IGN] International DORIS Service [Termes IGN] International Terrestrial Reference Frame [Termes IGN] mouvement du pôle [Termes IGN] positionnement par DORIS [Termes IGN] réseau Doris Résumé : (Auteur) DORIS is one of the four geodetic space techniques participating to the Global Geodetic Observing System (GGOS). Since the early development of this system, the Institut Géographique National played a specific and active role. Within, the International DORIS Service (IDS), IGN is in a particular position. While it is responsible for the installation and the maintenance of the DORIS ground tracking stations, it also handles one of the two IDS data center delivering DORIS data and products and has been an IDS Analysis Center for years, providing all possible IDS products, in particular the latest ignwd08 time series in preparation of ITRF2008. This paper explains the different aspects of the IGN contribution to IDS from an historical point of view, presents current activities and scientific results and provides a perspective for future activities. Recent DORIS results show a 10 mm precision or better when more than four DORIS satellites are available. Comparisons between recent DORIS solutions (ign07d02 and ign09d02) and past ITRF realizations show that errors are shared between the DORIS and the ITRF realizations. Some problems related to DORIS data processing are also discussed and possible ways to solve them in the future are discussed. In particular, we can now reject the tropospheric origin of the problem detected in the Envisat data after the software upload of October 12, 2004. A few applications in geodesy (terrestrial reference frame, Earth's polar motion) and geophysics are also discussed as a natural extension of these service-type activities. Numéro de notice : A2010-361 Affiliation des auteurs : IGN+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2009.09.019 Date de publication en ligne : 02/10/2009 En ligne : https://doi.org/10.1016/j.asr.2009.09.019 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30555 [article]

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The international DORIS service (IDS): toward maturity / Pascal Willis in Advances in space research, vol 45 n° 12 (15/06/2010)  

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vol 44 n° 11 - 1 December 2009 (Bulletin de Advances in space research)  

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The international Doris service, IDS activity report, January 2006 - December 2008 / Pierre Tavernier (2009)  

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Doris: from orbit determination for altimeter missions to geodesy / Pascal Willis in Comptes rendus : Géoscience, tome 338 n° 14-15 (novembre 2006)  

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First results of DORIS data analysis at Geodetic Observatory Pecný / Petr Štěpánek in Journal of geodesy, vol 80 n° 8-11 (November 2006)  

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The international DORIS service: genesis and early achievements / Gilles Tavernier in Journal of geodesy, vol 80 n° 8-11 (November 2006)  

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The International DORIS Service / Gilles Tavernier in Advances in space research, vol 36 n° 3 (March 2005)  

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DORIS et la géodésie globale / Pascal Willis (2003) 

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Current status of the doris pilot experiment and the future international doris service / Gilles Tavernier in Advances in space research, vol 30 n° 2 (July 2002)  

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