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Titre : International VLBI Service for Geodesy and Astrometry 2007 annual report Type de document : Rapport Auteurs : Dirk Behrend, Éditeur scientifique ; Karen D. Baver, Éditeur scientifique Editeur : Washington : National Aeronautics and Space Administration NASA Année de publication : 2008 Importance : 324 p. Format : 21 x 28 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] astrométrie
[Termes IGN] corrélateur
[Termes IGN] géodynamique
[Termes IGN] interférométrie à très grande base
[Termes IGN] observatoire astronomique
[Termes IGN] orientation de la Terre
[Termes IGN] radioastronomie
[Termes IGN] repère de référence
[Termes IGN] station VLBI
[Termes IGN] système de référence céleste
[Termes IGN] système de référence mondialNuméro de notice : 24929 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Rapport d'activité En ligne : http://ivscc.gsfc.nasa.gov/publications/annualreport.html Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=92846 Local ties, VLBI-GPS eccentricities and combination of geodetic reference frames / Claudio Abbondanza (2008)
Titre : Local ties, VLBI-GPS eccentricities and combination of geodetic reference frames : a critical investigation applied to the co-located observatory of Medicina Type de document : Thèse/HDR Auteurs : Claudio Abbondanza, Auteur Editeur : Bologne : Universita degli studi di Bologna Année de publication : 2008 Importance : 195 p. Format : 21 x 30 cm Note générale : Bibliographie
Dottorato di ricerca in scienze geodetiche e topografiche, Universita degli studi di BolognaLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] CATREF
[Termes IGN] co-positionnement
[Termes IGN] déformation de la croute terrestre
[Termes IGN] données GPS
[Termes IGN] données ITGB
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] points homologues
[Termes IGN] repère de référence
[Termes IGN] stabilité
[Termes IGN] station de référenceIndex. décimale : THESE Thèses et HDR Note de contenu : Introduction
1 Local Ties as result of a Network Approach
1.1 Local ties within the context of local and global geodetic networks
1.1.1 Global geodetic networks: some peculiarities
1.1.2 Reference point definition for a VLBI-GPS eccentricity
1.1.3 Reference point estimation for a VLBI-GPS eccentricity
1.2 Peculiarities of local geodetic networks for the eccentricity estimation
1.3 Articulation of a local tie estimation procedure
1.3.1 Datum definition for GPS-based and terrestrial local ties
1.4 Surveying the VLBI-GPS eccentricity at Medicina
1.4.1 Overview of terrestrial and GPS datasets
1.4.2 Site Description
1.4.3 The application of the indirect approach to the VLBI-GPS eccentricity
1.5 Terrestrial surveys at Medicina
1.5.1 Instruments and Devices
1.5.2 Ancillary GPS observations
1.5.3 Local geodetic network description
1.5.4 Terrestrial Network solutions
1.6 GPS-based surveys at Medicina
1.6.1 The experiences undertaken at Medicina
2 Eccentricity as outcome of a Local Tie
2.1 Geometrical modelling of reference points
2.1.1 The VLBI case
2.1.2 Construction of the normal conditioned system for a VLBI-GPS eccentricity
2.1.3 Geometric Hyper-conditioning
2.1.4 The GPS case
2.2 The passage from local to global reference frame
2.2.1 The GPS-dependency of terrestrial eccentricities
2.2.2 Self-consistency of GPS-based local ties
2.3 Some guidelines in the analysis of results
2.3.1 Geometrical modelling Scenarios proposed in the eccentricity estimations
2.4 Assessment of results
3 Local Ties and interactions with the combination of Geodetic Reference frames
3.1 The role of local ties in a combination procedure
3.1.1 A Balance Unknowns versus Pseudo-observations
3.1.2 Local ties: how to handle them
3.1.3 Local ties' usage within an ITRF combination
3.1.4 Local ties and criteria for their quality assessment
3.2 CATREF and Local ties
3.3 Analysis of the ITRF-like combinations performed
3.3.1 Input Data for the ITRF-like combinations
3.3.2 An outline of the ITRF-like combinations performed
3.3.3 Assessment of the results
3.4 Ill-alignment Scenarios
4. Local Ties, site stability and VLBI gravitational deformations
4.1 Site Stability via Local Ties' analysis
4.1.1 Introduction
4.1.2 Is it possible to detect relative site-dependent displacements from multi-temporal realizations of tie vectors?
4.2 Effects of deformations over the VLBI IP determination
4.2.1 Introduction
4.2.2 Local ties and VLBI deformations
4.2.3 VLBI deformational patterns through terrestrial observations
ConclusionNuméro de notice : 13752 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse française Note de thèse : Dottorato di ricerca : scienze geodetiche e topografiche : , Italia, Universita degli studi di Bologna : 2008 nature-HAL : Thèse DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=45232 Documents numériques
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13752_phd2008_ties-medicina_abbondanza.pdfAdobe Acrobat PDF Comparison 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)
[article]
Titre : Comparison of very long baseline interferometry, GPS, and satellite laser ranging height residuals from ITRF2005 using spectral and correlation methods Type de document : Article/Communication Auteurs : Xavier Collilieux , Auteur ; Zuheir Altamimi , Auteur ; David Coulot , Auteur ; Jim Ray, Auteur ; Patrick Sillard , Auteur Année de publication : 2007 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] analyse comparative
[Termes IGN] corrélation
[Termes IGN] données GPS
[Termes IGN] données ITGB
[Termes IGN] données TLS (télémétrie)
[Termes IGN] résiduRésumé : (auteur) For the first time, the ITRF2005 input data are in the form of time series of station positions and Earth orientation parameters, together with full variance-covariance information. The first step of the ITRF2005 analysis consists of rigorously stacking each time series to yield a long-term solution per technique. As a by-product, time series of position residuals contain the nonlinear motion of points over the Earth's surface. In this paper, the height residual time series of very long baseline interferometry (VLBI), Global Positioning System (GPS), and satellite laser ranging (SLR) solutions submitted to ITRF2005 are compared. We note that the interpretation of the ITRF2005 position residual time series as observed physical motions at the various stations is delicate due to the inhomogeneous site distribution. We estimate that the network effect may introduce an averaged scatter of 3 and 2 mm in the VLBI and SLR height residuals, respectively. Although noise levels are different among these three techniques, a common 1.0 cycles per year (cpy) frequency is clearly detected. The GPS height annual signal exhibits significant regional correlations that are confirmed by VLBI and SLR measurements in some colocated sites. Significant power near frequencies 2.00, 3.12, and 4.16 cpy is also detected in the individual GPS height residuals time series as mentioned by Ray et al. (2007). However, neither VLBI nor SLR show any significant signals at these frequencies for colocated sites. The agreement between detrended height time series at colocated sites is quantified using a novel method based on Kalman filtering and on maximum likelihood estimation. The GPS and VLBI measurements are shown to agree fairly well for most of the colocated sites. However, agreement is not generally observed in the GPS and SLR comparisons. A study of the interannual signal at colocated sites indicates that the good correlation cannot be completely attributed to the annual harmonic. Numéro de notice : A2007-660 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1029/2007JB004933 Date de publication en ligne : 28/12/2007 En ligne : https://doi.org/10.1029/2007JB004933 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102705
in Journal of geophysical research : Solid Earth > vol 112 n° B12 (December 2007)[article]ITRF2005: A new release of the International Terrestrial Reference Frame based on time series of station positions and Earth Orientation Parameters / Zuheir Altamimi in Journal of geophysical research : Solid Earth, vol 112 n° 9 (September 2007)
[article]
Titre : ITRF2005: A new release of the International Terrestrial Reference Frame based on time series of station positions and Earth Orientation Parameters Type de document : Article/Communication Auteurs : Zuheir Altamimi , Auteur ; Xavier Collilieux , Auteur ; J. Legrand, Auteur ; Bruno Garayt , Auteur ; Claude Boucher , Auteur Année de publication : 2007 Article en page(s) : pp B09401 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] interférométrie à très grande base
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] orientation de la TerreRésumé : (auteur) Unlike the past International Terrestrial Reference Frame (ITRF) versions where global long-term solutions were combined, the ITRF2005 uses as input data time series (weekly from satellite techniques and 24-h session-wise from Very Long Baseline Interferometry) of station positions and daily Earth Orientation Parameters (EOPs). The advantage of using time series of station positions is that it allows to monitor station non-linear motion and discontinuities and to examine the temporal behavior of the frame physical parameters, namely the origin and the scale. The ITRF2005 origin is defined in such a way that it has zero translations and translation rates with respect to the Earth center of mass, averaged by the Satellite Laser Ranging (SLR) time series spanning 13 years of observations. Its scale is defined by nullifying the scale and its rate with respect to the Very Long Baseline Interferometry (VLBI) time series spanning 26 years of observations. The ITRF2005 orientation (at epoch 2000.0) and its rate are aligned to the ITRF2000 using 70 stations of high geodetic quality. The estimated level of consistency of the ITRF2005 origin (at epoch 2000.0) and its rate with respect to the ITRF2000 is respectively 0.1, 0.8, 5.8 mm and 0.2, 0.1, 1.8 mm/yr along the X, Y and Z-axis. We estimate the formal errors on these components to be 0.3 mm and 0.3 mm/yr. We believe that this low level of agreement between the two frame origins is most probably due to the poor SLR network geometry and its degradation over time. The ITRF2005 combination involving 84 co-location sites revealed a scale inconsistency of 1 ppb (6.3 mm at the equator), at epoch 2000.0, and 0.08 ppb/yr between the SLR and VLBI long-term solutions as obtained by the stacking of their respective time series. Possible causes of this inconsistency may include the poor SLR and VLBI networks and their co-locations, local tie uncertainties, systematic effects and possible inconsistent model corrections used in the data analysis of both techniques. For the first time of the ITRF history, the ITRF2005 rigorous combination provides self-consistent series of EOPs, including Polar Motion from VLBI and satellite techniques and Universal Time and Length of Day from VLBI only. A velocity field of 152 sites with an error less than 1.5 mm/yr is used to estimate absolute rotation poles of 15 tectonic plates that are consistent with the ITRF2005 frame. This new absolute plate motion model supersedes and significantly improves that of the ITRF2000 which involved six major tectonic plates. Numéro de notice : A2007-684 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Article DOI : 10.1029/2007JB004949 Date de publication en ligne : 07/09/2007 En ligne : https://doi.org/10.1029/2007JB004949 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102733
in Journal of geophysical research : Solid Earth > vol 112 n° 9 (September 2007) . - pp B09401[article]Combined Earth orientation parameters based on homogeneous and continuous VLBI and GPS data / Daniela Thaller in Journal of geodesy, vol 81 n° 6-8 (June - August 2007)
[article]
Titre : Combined Earth orientation parameters based on homogeneous and continuous VLBI and GPS data Type de document : Article/Communication Auteurs : Daniela Thaller, Auteur ; Manuela Krügel, Auteur ; Markus Rothacher, Auteur ; et al., Auteur Année de publication : 2007 Article en page(s) : pp 529 - 541 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] Bernese
[Termes IGN] données GPS
[Termes IGN] données ITGB
[Termes IGN] mouvement du pôle
[Termes IGN] nutation
[Termes IGN] point de liaison (géodésie)
[Termes IGN] rotation de la TerreRésumé : (Auteur) The CONT02 campaign is of great interest for studies combining very long baseline interferometry (VLBI) with other space-geodetic techniques, because of the continuously available VLBI observations over 2 weeks in October 2002 from a homogeneous network. Especially, the combination with the Global Positioning System (GPS) offers a broad spectrum of common parameters. We combined station coordinates, Earth orientation parameters (EOPs) and troposphere parameters consistently in one solution using technique- specific datum-free normal equation systems. In this paper, we focus on the analyses concerning the EOPs, whereas the comparison and combination of the troposphere parameters and station coordinates are covered in a companion paper in Journal of Geodesy. In order to demonstrate the potential of the VLBI and GPS space-geodetic techniques, we chose a sub-daily resolution for polar motion (PM) and universal time (UT). A consequence of this solution set-up is the presence of a one-to-one correlation between the nutation angles and a retrograde diurnal signal in PM. The Bernese GPS Software used for the combination provides a constraining approach to handle this singularity. Simulation studies involving both nutation offsets and rates helped to get a deeper understanding of this singularity. With a rigorous combination of UT1–UTC and length of day (LOD) from VLBI and GPS, we showed that such a combination works very well and does not suffer from the systematic effects present in the GPS-derived LOD values. By means of wavelet analyses and the formal errors of the estimates, we explain this important result. The same holds for the combination of nutation offsets and rates. The local geodetic ties between GPS and VLBI antennas play an essential role within the inter-technique combination. Several studies already revealed non-negligible discrepancies between the terrestrial measurements and the space-geodetic solutions. We demonstrate to what extent these discrepancies propagate into the combined EOP solution. Copyright Springer Numéro de notice : A2007-243 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0115-z En ligne : https://doi.org/10.1007/s00190-006-0115-z Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28606
in Journal of geodesy > vol 81 n° 6-8 (June - August 2007) . - pp 529 - 541[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-07062 RAB Revue Centre de documentation En réserve L003 Disponible 266-07061 RAB Revue Centre de documentation En réserve L003 Disponible Indirect approach to invariant point determination for SLR and VLBI systems: an assessment / John Dawson in Journal of geodesy, vol 81 n° 6-8 (June - August 2007)PermalinkThe impact of radio source structure on European geodetic VLBI measurements / V. Tornatore in Journal of geodesy, vol 81 n° 6-8 (June - August 2007)PermalinkA comparison of GPS, VLBI and model estimates of ocean tide loading displacements / I.D. Thomas in Journal of geodesy, vol 81 n° 5 (May 2007)PermalinkPermalinkProccedings of the 18th European VLBI for geodesy and astrometry working meeting, Vienna, 12-13 April 2007 / Johannes Böhm (2007)PermalinkSpace geodetic techniques and the canadian spatial reference system evolution, status and possibilities / Pierre Héroux in Geomatica, vol 60 n° 2 (June 2006)PermalinkPermalinkPermalinkPermalinkPermalink