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Evaluation of the impact of atmospheric pressure loading modeling on GNSS data analysis / Rolf Dach in Journal of geodesy, vol 85 n° 2 (February 2011)
[article]
Titre : Evaluation of the impact of atmospheric pressure loading modeling on GNSS data analysis Type de document : Article/Communication Auteurs : Rolf Dach, Auteur ; Johannes Böhm , Auteur ; Simon Lutz, Auteur ; Peter Steigenberger, Auteur ; Gerhard Beutler, Auteur Année de publication : 2011 Article en page(s) : pp 75 - 91 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse de données
[Termes IGN] données GNSS
[Termes IGN] impact sur les données
[Termes IGN] International GNSS Service
[Termes IGN] série temporelle
[Termes IGN] signal GNSS
[Termes IGN] surcharge atmosphérique
[Termes IGN] variation saisonnièreRésumé : (Auteur) In recent years, several studies have demonstrated the sensitivity of Global Navigation Satellite System (GNSS) station time series to displacements caused by atmospheric pressure loading (APL). Different methods to take the APL effect into account are used in these studies: applying the corrections from a geophysical model on weekly mean estimates of station coordinates, using observation-level corrections during data analysis, or solving for regression factors between the station displacement and the local pressure. The Center for Orbit Determination in Europe (CODE) is one of the global analysis centers of the International GNSS Service (IGS). The current quality of the IGS products urgently asks to consider this effect in the regular processing scheme. However, the resulting requirements for an APL model are demanding with respect to quality, latency, and—regarding the reprocessing activities—availability over a long time interval (at least from 1994 onward). The APL model of Petrov and Boy (J Geophys Res 109:B03405, 2004) is widely used within the VLBI community and is evaluated in this study with respect to these criteria. The reprocessing effort of CODE provides the basis for validating the APL model. The data set is used to solve for scaling factors for each station to evaluate the geophysical atmospheric non-tidal loading model. A consistent long-term validation of the model over 15 years, from 1994 to 2008, is thus possible. The time series of 15 years allows to study seasonal variations of the scaling factors using the dense GNSS tracking network of the IGS. By interpreting the scaling factors for the stations of the IGS network, the model by (2004) is shown to meet the expectations concerning the order of magnitude of the effect at individual stations within the uncertainty given by the GNSS data processing and within the limitations due to the model itself. The repeatability of station coordinates improves by 20% when applying the effect directly on the data analysis and by 10% when applying a post-processing correction to the resulting weekly coordinates compared with a solution without taking APL into account. Numéro de notice : A2011-067 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0417-z Date de publication en ligne : 22/10/2010 En ligne : https://doi.org/10.1007/s00190-010-0417-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30848
in Journal of geodesy > vol 85 n° 2 (February 2011) . - pp 75 - 91[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2011021 RAB Revue Centre de documentation En réserve L003 Disponible
Titre : Impact of a priori gradients on VLBI-derived terrestrial reference frames Type de document : Article/Communication Auteurs : Johannes Böhm , Auteur ; H. Spicakova, Auteur ; L. Urquhart, Auteur ; et al., Auteur Editeur : Bonn : Universität Bonn Année de publication : 2011 Collection : Schriftenreihe des Instituts für Geodäsie und Geoinformation, ISSN 2699-6685 num. 22 Conférence : EVGA 2011, 20th working meeting of the European VLBI Group for Geodesy and Astrometry 29/03/2011 30/03/2011 Bonn Allemagne OA proceedings Importance : pp 128 - 132 Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] analyse diachronique
[Termes IGN] données ITGB
[Termes IGN] gradient de troposphère
[Termes IGN] International Terrestrial Reference FrameRésumé : (Auteur) We compare the influence of two different a priori gradient models on the terrestrial reference frame (TRF) as determined from Very Long Baseline Interferometry (VLBI) observations. One model has been determined by vertical integration over horizontal gradients of refractivity as derived from data of the Goddard Data Assimilation Office (DAO), whereas the second model (APG) has been determined by ray-tracing through monthly mean pressure level re-analysis data of the European Centre for Medium-Range Weather Forecasts. We compare VLBI solutions from 1990.0 to 2011.0 with fixed DAO and APG gradients to a solution with gradients being estimated, and we find better agreement of station coordinates when fixing DAO gradients compared to fixing APG gradients. As a consequence, we recommend that gradients are constrained to DAO gradients, in particular in the early years of VLBI observations (up to about 1990), when the number of stations per session is small and the sky distribution is far from uniform. Later than 1990, the gradients can be constrained loosely and the a priori model is of minor importance. Numéro de notice : C2011-052 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64322 Documents numériques
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14256_evga2011_boehm.pdfAdobe Acrobat PDF Improved constraints on models of glacial isostatic adjustment: A review of the contribution of ground-based geodetic observations / Matt A. King in Surveys in Geophysics, vol 31 n° 5 (September 2010)
[article]
Titre : Improved constraints on models of glacial isostatic adjustment: A review of the contribution of ground-based geodetic observations Type de document : Article/Communication Auteurs : Matt A. King, Auteur ; Zuheir Altamimi , Auteur ; Johannes Böhm , Auteur ; Machiel Bos, Auteur ; Rolf Dach, Auteur ; Pedro Elosegui, Auteur ; François Fund, Auteur ; Manuel Hernández-Pajares, Auteur ; David Lavallée, Auteur ; Paulo Jorge Mendes Cerveira, Auteur ; Nigel Penna, Auteur ; Riccardo Riva, Auteur ; Peter Steigenberger, Auteur ; Tonie M. van Dam, Auteur ; Luca Vittuari, Auteur ; Simon D.P. Williams, Auteur ; Pascal Willis , Auteur Année de publication : 2010 Article en page(s) : pp 465 - 507 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Antarctique
[Termes IGN] bilan de masse
[Termes IGN] calotte glaciaire
[Termes IGN] champ de vitesse
[Termes IGN] données GRACE
[Termes IGN] Groenland
[Termes IGN] mesure géodésique
[Termes IGN] positionnement par DORIS
[Termes IGN] positionnement par GPS
[Termes IGN] positionnement par ITGB
[Termes IGN] positionnement par télémétrie laser sur satellite
[Termes IGN] rebond post-glaciaireRésumé : (auteur) The provision of accurate models of Glacial Isostatic Adjustment (GIA) is presently a priority need in climate studies, largely due to the potential of the Gravity Recovery and Climate Experiment (GRACE) data to be used to determine accurate and continent-wide assessments of ice mass change and hydrology. However, modelled GIA is uncertain due to insufficient constraints on our knowledge of past glacial changes and to large simplifications in the underlying Earth models. Consequently, we show differences between models that exceed several mm/year in terms of surface displacement for the two major ice sheets: Greenland and Antarctica. Geodetic measurements of surface displacement offer the potential for new constraints to be made on GIA models, especially when they are used to improve structural features of the Earth’s interior as to allow for a more realistic reconstruction of the glaciation history. We present the distribution of presently available campaign and continuous geodetic measurements in Greenland and Antarctica and summarise surface velocities published to date, showing substantial disagreement between techniques and GIA models alike. We review the current state-of-the-art in ground-based geodesy (GPS, VLBI, DORIS, SLR) in determining accurate and precise surface velocities. In particular, we focus on known areas of need in GPS observation level models and the terrestrial reference frame in order to advance geodetic observation precision/accuracy toward 0.1 mm/year and therefore further constrain models of GIA and subsequent present-day ice mass change estimates. Numéro de notice : A2010-663 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s10712-010-9100-4 Date de publication en ligne : 16/06/2010 En ligne : https://doi.org/10.1007/s10712-010-9100-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91769
in Surveys in Geophysics > vol 31 n° 5 (September 2010) . - pp 465 - 507[article]Documents numériques
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Improved constraints on models ... - pdf éditeurAdobe Acrobat PDF Asymmetric tropospheric delays from numerical weather models for UT1 determination from VLBI Intensive sessions on the baseline Wettzell–Tsukuba / Johannes Böhm in Journal of geodesy, vol 84 n° 5 (May 2010)
[article]
Titre : Asymmetric tropospheric delays from numerical weather models for UT1 determination from VLBI Intensive sessions on the baseline Wettzell–Tsukuba Type de document : Article/Communication Auteurs : Johannes Böhm , Auteur ; T. Hobiger, Auteur ; R. Ichikawa, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 319 - 325 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] interférométrie à très grande base
[Termes IGN] Japon
[Termes IGN] ligne de base
[Termes IGN] modèle atmosphérique
[Termes IGN] propagation troposphérique
[Termes IGN] temps universel
[Termes IGN] WettzellRésumé : (Auteur) One-baseline 1-h Very Long Baseline Interferometry (VLBI) Intensive sessions are carried out every day to determine Universal Time (UT1). Azimuthal asymmetry of tropospheric delays around the stations is usually ignored and not estimated because of the small number of observations. In this study we use external information about the asymmetry for the Intensive sessions between Tsukuba (Japan) and Wettzell (Germany), which are carried out on Saturdays and Sundays (1) from direct ray-tracing for each observation at Tsukuba and (2) in the form of linear horizontal north and east gradients every 6 h at both stations. The change of the UT1 estimates is at the 10 us level with maximum differences of up to 50 us, which is clearly above the formal uncertainties of the UT1 estimates (between 5 and 20 us). Spectral analysis reveals that delays from direct ray-tracing for the station Tsukuba add significant power at short periods (1–2 weeks) w.r.t. the state-of-the-art approach, and comparisons with length-of-day (LOD) estimates from Global Positioning System (GPS) indicate that these ray-traced delays slightly improve the UT1 estimates from Intensive sessions. Numéro de notice : A2010-184 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-010-0370-x Date de publication en ligne : 05/03/2010 En ligne : https://doi.org/10.1007/s00190-010-0370-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30379
in Journal of geodesy > vol 84 n° 5 (May 2010) . - pp 319 - 325[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-2010051 SL Revue Centre de documentation Revues en salle Disponible Proccedings of the 18th European VLBI for geodesy and astrometry working meeting, Vienna, 12-13 April 2007 / Johannes Böhm (2007)
Titre : Proccedings of the 18th European VLBI for geodesy and astrometry working meeting, Vienna, 12-13 April 2007 Type de document : Actes de congrès Auteurs : Johannes Böhm , Éditeur scientifique ; A. Pany, Éditeur scientifique ; Harald Schuh, Éditeur scientifique Editeur : Vienne [Autriche] : Technische Universität Wien Année de publication : 2007 Collection : Geowissenschaftliche Mitteilungen, ISSN 1811-8380 num. 79 Conférence : EVGA 2007, 18th working meeting on European VLBI for geodesy and astrometry 12/04/2007 13/04/2007 Vienne Autriche OA proceedings Importance : 224 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données ITGB
[Termes IGN] interférométrie à très grande base
[Termes IGN] orientation de la Terre
[Termes IGN] téléscopeNote de contenu : Session1
Status of Geodetic Application Research in KASI / Kwak Y, Cho J, Park J
Medicina and Noto VLBI Radiotelescopes: gravitational deformations evaluated with terrestrial laser scanning / Montaguti S, Vittuari L, Sarti P, Negusini, M
IAA RAS Radio Telescope Monitoring System / Mikhailov A, Lavrov A
Recent Developments at the EVN Mk IV Data Processor at JIVE / Campbell R M, Szomoru A
The Bonn Mark IV Correlator for Astronomy and Geodesy / Alef W, Bertarini A, Muskens A
Software Correlator at MPIfR: Status report / Alef W, Graham DA, Rottmann H, Roy A L, Bertarini A, Deller A T, Tingay S J
e-VLBl data transfer from Onsala and Metsahovi to the Bonn correlator / Haas R, Wagner J, Miijunen A, Ritakari J, Miiskens A, Dulfer C, Bertarini A
Session 2
The Mark 5 VLBI Data System / Whitney AR
Wide-Bandwidth Digital Backend System for VLBI / Whitney AR
DBBC - A Flexible Environment for VLBI and Space Research: Digital Receiver and Back-end Systems / Tuccari G, Buttaccio S, Nicotra G, Alef W, Keller Rt Nalbach M, Wunderlich M
Effect on Geodetic-VLBI Measurables due to Polarization Leakage in the Receivers / Bertarini A, Alef W, Corey B E, Nothnagel A, Walker R C
SATTRACK - A Satellite Tracking Module for the VLBI Field System / Moya Espinosa M, Haas R
GFNS: a new tool for VLBI Geodesy and Astrometry / Bourda G, Chariot P, Biancale R
Baseline length repeatability / Titov O
Session 3
ERP time series with daily and sub-daily resolution determined from CONT05 / Artz T, Bockmann S, Nothnagel A, Tesmer V
On dependence of EOP precision and accuracy on VLBI network / Malkin Z
QUASAR software in IAA EOP service: Global Solution and Daily SINEX / Kurdubov S
Comparison and combination of consistent VLBI solutions / Bockmann S, Artz T, Nothnagel A, Tesmer V
Long-term trends of water vapour from VLBI observations / Heinkelmann R, Bohm J, Schuh H, Schmidt M
An analysis of celestial pole offset observations in the free core nutation frequency band / Molten Z, Miller N
Session 4
On Comparison and Combination of Radio Source Catalogues / Sokolova J R, Malkin Z M
Effect of various analysis options on VLBI-determined CRF / Tesmer V
Linking Deep Astrometric Standards to the ICRF /Frey S, Platais I, Fey A L
On the role of differenced phase-delays in high-precision wide-field multi-source astrometry / Marti- Vidal /, Marcaide J M, Guirado JC
Comparison and Cut off Angle Tests for Observed and Simulated CONT05 Sessions / Teke K, Wresnik J, Bohm J, Schuh H
Session 5
Incorporating Correlated Station Dependent Noise Improves VLB! Estimates / Gipson J M
Optimum modeling of troposphere and clock parameters in VLBI / Pony A, Wresnik J, Bohm J, Schuh H
Using source maps for scheduling and data analysis: approaches and strategies / Petrov L
Studying the geodynamics of the Etnean area by means of VLBI and GPS / Di Martino S, La Delfa S, Patane G, Negusini M
Forecasting Data of the Troposphere Used for IVS Intensive Sessions / Bohm J, Schuh H
Session 6
Twin-Telescope Wettzell TTW / Hase H, Dassing R, Kronschnabl G, Schluter W, Schwarz W, Lauber P, Kilger R
VLB 12010 Simulations Using SOLVE / MacMillan D S
Monte Carlo Simulations for VLB12010 / Wresnik J, BohmJ, Schuh H
Simulations of atmospheric path delays using turbulence models / Nilsson T, Haas R, Elgered G
Kashima Ray-Tracing Service (KARATS) - Fast ray-tracing through numerical weather models for real-time positioning applications in East Asia / Hobiger T, Ichikawa R, Koyama Y, Kondo T
INTENSIVE - A strategic approach to improve technology and scientific results / Engen B
Posters
An Analysis of Local Tie Vectors' Temporal Evolution and Site Stability at Medicina Observatory through Terrestrial and GPS-based Observations / Abbondanza C, Vittuari L, Sarti P, Negusini M
MK3TOOLS & NetCDF - storing VLBI data in a machine independent array oriented data format / Hobiger Th, Kondo T, Koyama Y
A Comparison of intraday variations of the Earth orientation parameters from different VLBI solutions / Kudryashova M, MacMillan D S, Tilov O
Effects of Geodetic Datum Definition on the Celestial and Terrestrial Reference Frames determined by VLBI / Heinkelmann R, Bohm J, Schuh H
Some issues about the Earth's core and inner core through VLBI / Lambert S, Dehant V, Gontier A -M
Datum Deficiency in VLBI Analysis: Case Study of Session 021020XA / Mendes Cerveira P J, Boehm J, Tanir E, Wresnik J, Schuh H, Tesmer V
VLBI Intra-technique Combination for Kalman Filter and Least-Squares Solutions / Tanir E, Boehm J, Schuh H, Tornatore V, Felsenstein K
VLBI Terminal in Badary Observatory / Fedotov L VNuméro de notice : 14474 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes DOI : sans En ligne : https://www.oso.chalmers.se/evga/18_EVGA_2007_Wien.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34663 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14474-01 CG2007 Livre Centre de documentation Congrès Disponible Tropospheric delay modelling at radio wavelengths for space geodetic techniques / Johannes Böhm (2007)PermalinkMulti-technique comparison of tropospheric zenith delays derived during the CONT02 campaign / Pascal Willis in Journal of geodesy, vol 79 n° 10-11 (February 2006)PermalinkPermalink
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