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Auteur Hervé Fagard
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auteur IGN, géodésien
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Affiner la recherche Interroger des sources externesRecent improvements in DORIS data processing at IGN in view of ITRF2008, the IGNWD08 Solution / Pascal Willis (2012)
Titre : Recent improvements in DORIS data processing at IGN in view of ITRF2008, the IGNWD08 Solution Type de document : Article/Communication Auteurs : Pascal Willis 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 43 - 49 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] chaîne de traitement
[Termes IGN] données DORIS
[Termes IGN] Institut géographique national (France)
[Termes IGN] International Terrestrial Reference FrameRésumé : (auteur) In preparation for the computation of ITRF2008, the DORIS IGN analysis center has undertaken the task of a complete reprocessing of all DORIS data from 1993.0 to 2009.0, using all available DORIS data as well as the most recent models and estimation strategies. We provide here a detailed description of the major improvements recently made in the DORIS data processing, mainly in terms of solar radiation pressure, atmospheric drag, gravity field, and tropospheric correction. We address here the impact of the new IGN time series (ignwd08) on geodetic products using comparison to the previous IGN solutions (ignwd04). In particular, previous artifacts, such as 118-day or 1-year periodic errors in the TZ-geocenter solution or in the vertical component of high latitude DORIS tracking stations, have now disappeared, leading to more precise and reliable time series of DORIS station coordinates. Finally, possible future improvements are discussed proposing new investigations for the future. Numéro de notice : C2009-031 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : 10.1007/978-3-642-20338-1_6 Date de publication en ligne : 26/07/2011 En ligne : https://doi.org/10.1007/978-3-642-20338-1_6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91513
Titre : Contributions of the French Institut Géographique National (IGN) to the International DORIS Service Type de document : Article/Communication Auteurs : Pascal Willis 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 DorisRésumé : (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
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1470 - 1480[article]
Titre : The international DORIS service (IDS): toward maturity Type de document : Article/Communication Auteurs : Pascal Willis Année de publication : 2010 Article en page(s) : pp 1408 - 1420 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données DORIS
[Termes IGN] ENVISAT
[Termes IGN] Global Geodetic Observing System
[Termes IGN] International DORIS Service
[Termes IGN] orbitographie
[Termes IGN] positionnement par DORIS
[Termes IGN] série temporelle
[Termes IGN] SPOT
[Termes IGN] station DORISRésumé : (Auteur) DORIS is one of the four space-geodetic techniques participating in the Global Geodetic Observing System (GGOS), particularly to maintain and disseminate the Terrestrial Reference Frame as determined by International Earth rotation and Reference frame Service (IERS). A few years ago, under the umbrella of the International Association of Geodesy, a DORIS International Service (IDS) was created in order to foster international cooperation and to provide new scientific products. This paper addresses the organizational aspects of the IDS and presents some recent DORIS scientific results. It is for the first time that, in preparation of the ITRF2008, seven Analysis Centers (AC’s) contributed to derive long-term time series of DORIS stations positions. These solutions were then combined into a homogeneous time series IDS-2 for which a precision of less than 10 mm was obtained. Orbit comparisons between the various AC’s showed an excellent agreement in the radial component, both for the SPOT satellites (e.g. 0.5–2.1 cm RMS for SPOT-2) and Envisat (0.9–2.1 cm RMS), using different software packages, models, corrections and analysis strategies. There is now a wide international participation within IDS that should lead to future improvements in DORIS analysis strategies and DORIS-derived geodetic products. Numéro de notice : A2010-359 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2009.11.018 Date de publication en ligne : 24/11/2009 En ligne : http://dx.doi.org/10.1016/j.asr.2009.11.018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30553
in Advances in space research > vol 45 n° 12 (15/06/2010) . - pp 1408 - 1420[article]
Titre : DPOD2005: An extension of ITRF2005 for Precise Orbit Determination Type de document : Article/Communication Auteurs : Pascal Willis Année de publication : 2009 Article en page(s) : pp 535 - 544 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] coordonnées cartésiennes géocentriques
[Termes IGN] DORIS
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orbitographie par GNSS
[Termes IGN] série temporelle
[Termes IGN] station DORISRésumé : (auteur) For Precise Orbit Determination of altimetry missions, we have computed a data set of DORIS station coordinates defined for specific time intervals called DPOD2005. This terrestrial reference set is an extension of ITRF2005. However, it includes all new DORIS stations and is more reliable, as we disregard stations with large velocity formal errors as they could contaminate POD computations in the near future. About 1/4 of the station coordinates need to be defined as they do not appear in the original ITRF2005 realization. These results were verified with available DORIS and GPS results, as the integrity of DPOD2005 is almost as critical as its accuracy. Besides station coordinates and velocities, we also provide additional information such as periods for which DORIS data should be disregarded for specific DORIS stations, and epochs of coordinate and velocity discontinuities (related to either geophysical events, equipment problem or human intervention). The DPOD model was tested for orbit determination for TOPEX/Poseidon (T/P), Jason-1 and Jason-2. Test results show DPOD2005 offers improvement over the original ITRF2005, improvement that rapidly and significantly increases after 2005. Improvement is also significant for the early T/P cycles indicating improved station velocities in the DPOD2005 model and a more complete station set. Following 2005 the radial accuracy and centering of the ITRF2005-original orbits rapidly degrades due to station loss. Numéro de notice : A2009-596 Affiliation des auteurs : IGN+Ext (1940-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.asr.2009.04.018 En ligne : https://doi.org/10.1016/j.asr.2009.04.018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101993
in Advances in space research > vol 44 n° 5 (1 September 2009) . - pp 535 - 544[article]The international Doris service, IDS activity report, January 2006 - December 2008 / Pierre Tavernier (2009)
Titre : The international Doris service, IDS activity report, January 2006 - December 2008 Type de document : Rapport Auteurs : Pierre Tavernier, Auteur ; Pascale Ferrage, Auteur ; International Doris Service, Auteur ; Hervé Fagard, Auteur ; et al., Auteur Editeur : Paris, Toulouse, Kourou [France] : Centre National d'Etudes Spatiales CNES Année de publication : 2009 Importance : 91 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] altimètre
[Termes IGN] données DORIS
[Termes IGN] International DORIS Service
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orbitographie
[Termes IGN] réseau Doris
[Termes IGN] station DORISNote de contenu : IDS AND DORIS QUICK REFERENCE LIST
GLOSSARY.
1 INTRODUCTION.
2 DORIS SPECIAL ISSUE IN JOURNAL OF GEODESY.
3 HISTORY.
4 ORGANIZATION.
5 THE CENTRAL BUREAU: IDS INFORMATION SYSTEM.
5.1 WHAT AND WHERE
5.2 WEB AND FTP SITES
5.2.1 IDS WEB SITE5.2.2 IDS FTP SERVER
5.2.3 DORIS WEB SITE
5.2.4 DATA CENTERS' WEB SITES
5.3 THE MAIL SYSTEM
5.3.1 DORISMAIL.
5.3.2 DORISREPORT
5.3.3 IDS ANALYSIS FORUM
5.3.4 OTHER MAILING LISTS
5.4 HELP TO THE USERS
5.5 FUTURE PLAN
6 THE NETWORK
6.1 GENERAL STATUS OF THE NETWORK.
6.2 RENOVATION PROGRAM OF THE PERMANENT NETWORK.
6.3 THIRD GENERATION BEACONS DEPLOYMENT STATUS
6.4 CO-LOCATIONS WITH OTHER IERS TECHNIQUES
7 THE SATELLITES FITTED OUT WITH DORIS RECEIVERS
IDS DATA FLOW COORDINATION (2006-2008)..
7.1 INTRODUCTION
7.2 FLOW OF IDS DATA AND PRODUCTS
7.3 DORIS DATA.
7.4 DORIS PRODUCTS
7.5 FUTURE PLANS
8 IDS DATA CENTERS
8.1 CRUSTAL DYNAMICS DATA INFORMATION SYSTEM (CDDIS)
8.1.1 PRESENTATION
8.1.2 CDDIS FUTURE PLANS
8.1.3 CDDIS CONTACT
8.2 IGN DORIS DATA CENTER
9 IDS ANALYSIS COORDINATION
9.1 ANALYSIS COORDINATION
9.2 ORBIT TESTS: RESULTS OF PRELIMINARY ORBIT COMPARISONS
9.3 SINEX FILE VALIDATION
9.4 ANALYSIS CENTERS STATUS AS OF DECEMBER 2008
10IDS COMBINATION
10.1 ACTIVITY SUMMARY
10.2 IDS VALIDATION OF SINEX
10.3 CONTRIBUTION TO ITRF2008
10.4 JASON-2
10.5 FUTURE COMBINATIONS
11 REPORT OF THE ESA/ESOC ANALYSIS CENTER (ESA)
11.1 INTRODUCTION
11.2 ITRF-2008 ACTIVITIES
11.3 FUTURE ACTIVITIES
12 REPORT OF THE GEOSCIENCE AUSTRALIA ANALYSIS CENTER (GAU)
12.1 INTRODUCTION
12.2 DATA PROCESSING
12.3 ORBIT COMPARISON TESTS
12.4 SINEX SUBMISSIONS
12.5 BENCHMARK TESTS
13 REPORT OF THE GEODETICAL OBSERVATORY PECNY ANALYSIS CENTER (GOP)
13.1 INTRODUCTION
13.2 ANALYSIS STRATEGY AND MODELS
13.3 AUTOMATION...
13.4 RESULTS AND PRODUCTS..
14 REPORT OF THE NASA/GSFC ANALYSIS CENTER (GSC)
14.1 ITRF2005 & SAA MODEL TESTING AND VALIDATION
14.2 MODEL IMPROVEMENTS FOR ALTIMETER SATELLITE POD
14.3 DEFINITION OF AN OPTIMAL ANALYSIS STRATEGY FOR DORIS PROCESSING
14.4 OTHER ANALYSIS CENTER ACTIVITIES IN 2008.
15 REPORT OF THE IGN/JPL ANALYSIS CENTER (IGN).
15.1 CONTEXT.
15.2 PRODUCTS DELIVERED (2006-2008)..
15.3 MAJOR IMPROVEMENTS.
16REPORT OF THE INASAN ANALYSIS CENTER (INA)
16.1 INTRODUCTION.
16.2 PRODUCT AND ANALYSIS RESULTS DESCRIPTIONS.
17REPORT OF THE CNES/CLS ANALYSIS CENTER (LCA).
17.1 CONTEXT
17.2 DATA PROCESSING.
17.3 PRODUCTS DELIVERED TO IDS....
17.3.1 WEEKLY SINEX
17.3.2 WEEKLY COORDINATE TIME SERIES.
17.3.3 ORBITS..
18 REPORT OF THE NEWCASTLE UNIVERSITY ANALYSIS CENTER (NCL).
19REFERENCES
20PUBLICATIONS (2006-2008)
APPENDIX: DORIS STATIONS COLOCATION WITH TIDE GAUGES.Numéro de notice : 15455 Affiliation des auteurs : IGN (1940-2011) Thématique : POSITIONNEMENT Nature : Rapport d'activité En ligne : http://ids-doris.org/documents/report/IDS_Report_2006_2008.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=40693 Exemplaires(1)
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