Descripteur
Termes IGN > sciences naturelles > sciences de la Terre et de l'univers > géosciences > géophysique interne > géodésie > géodésie physique > orientation de la Terre
orientation de la TerreVoir aussi |
Documents disponibles dans cette catégorie (359)
Ajouter le résultat dans votre panier
Visionner les documents numériques
Affiner la recherche Interroger des sources externes
Etendre la recherche sur niveau(x) vers le bas
Journées 2013, Systèmes de référence spatio-temporels, Paris, 16 - 18 September 2013 / Nicole Capitaine (2014)
Titre : Journées 2013, Systèmes de référence spatio-temporels, Paris, 16 - 18 September 2013 : Développements scientifiques à partir de systèmes de référence de haute exactitude Titre original : Scientific developments from highly accurate space-time reference systems Type de document : Actes de congrès Auteurs : Nicole Capitaine, Éditeur scientifique Editeur : Paris, Meudon et Nançay : Observatoire de Paris Année de publication : 2014 Conférence : JSRST 2013, Journées systèmes de référence spatio-temporels, Scientific developments from highly accurate space-time reference systems 16/09/2013 18/09/2013 Paris France OA Proceedings Format : 21 x 30 cm ISBN/ISSN/EAN : 978-2-901057-69-7 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux
[Termes IGN] échelle de temps
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] repère de référence céleste international
[Termes IGN] rotation de la Terre
[Termes IGN] soleil (étoile)
[Termes IGN] système de référence géodésiqueNuméro de notice : 17019 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes DOI : sans En ligne : http://syrte.obspm.fr/jsr/journees2013/pdf/ Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78597 Documents numériques
en open access
Journées 2013, Systèmes de référence spatio-temporelsAdobe Acrobat PDF Non-linear station motions in epoch and multi-year reference frames / Mathis Blossfeld in Journal of geodesy, vol 88 n° 1 (January 2014)
[article]
Titre : Non-linear station motions in epoch and multi-year reference frames Type de document : Article/Communication Auteurs : Mathis Blossfeld, Auteur Année de publication : 2014 Article en page(s) : pp 45 - 63 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données GPS
[Termes IGN] données ITGB
[Termes IGN] données TLS (télémétrie)
[Termes IGN] orientation de la Terre
[Termes IGN] repère de référence
[Termes IGN] station GPS
[Termes IGN] surveillance d'ouvrage
[Termes IGN] surveillance géologiqueRésumé : (Auteur) In the conventions of the International Earth Rotation and Reference Systems Service (e.g. IERS Conventions 2010), it is recommended that the instantaneous station position, which is fixed to the Earth’s crust, is described by a regularized station position and conventional correction models. Current realizations of the International Terrestrial Reference Frame use a station position at a reference epoch and a constant velocity to describe the motion of the regularized station position in time. An advantage of this parameterization is the possibility to provide station coordinates of high accuracy over a long time span. Various publications have shown that residual non-linear station motions can reach a magnitude of a few centimeters due to not considered loading effects. Consistently estimated parameters like the Earth Orientation Parameters (EOP) may be affected if these non-linear station motions are neglected. In this paper, we investigate a new approach, which is based on a frequent (e.g. weekly) estimation of station positions and EOP from a combination of epoch normal equations of the space geodetic techniques Global Positioning System (GPS), Satellite Laser Ranging (SLR) and Very Long Baseline Interferometry (VLBI). The resulting time series of epoch reference frames are studied in detail and are compared with the conventional secular approach. It is shown that both approaches have specific advantages and disadvantages, which are discussed in the paper. A major advantage of the frequently estimated epoch reference frames is that the non-linear station motions are implicitly taken into account, which is a major limiting factor for the accuracy of the secular frames. Various test computations and comparisons between the epoch and secular approach are performed. The authors found that the consistently estimated EOP are systematically affected by the two different combination approaches. The differences between the epoch and secular frames reach magnitudes of 23.6 uas (0.73 mm) and 39.8 uas (1.23 mm) for the x-pole and y-pole, respectively, in case of the combined solutions. For the SLR-only solutions, significant differences with amplitudes of 77.3 uas (2.39 mm) can be found. Numéro de notice : A2014-102 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0668-6 Date de publication en ligne : 05/11/2013 En ligne : https://doi.org/10.1007/s00190-013-0668-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33007
in Journal of geodesy > vol 88 n° 1 (January 2014) . - pp 45 - 63[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2014011 SL Revue Centre de documentation Revues en salle Disponible Combination of modeled short-term angular momentum function forecasts from atmosphere, ocean, and hydrology with 90-day EOP predictions / Robert Dill in Journal of geodesy, vol 87 n° 6 (June 2013)
[article]
Titre : Combination of modeled short-term angular momentum function forecasts from atmosphere, ocean, and hydrology with 90-day EOP predictions Type de document : Article/Communication Auteurs : Robert Dill, Auteur ; H. Dobslaw, Auteur ; M. Thomas, Auteur Année de publication : 2013 Article en page(s) : pp 567 - 577 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] moment cinétique atmosphérique
[Termes IGN] moment cinétique océanique
[Termes IGN] orientation de la Terre
[Termes IGN] prévisionRésumé : (Auteur) Angular momentum forecasts for up to 10 days into the future, modeled from predicted states of the atmosphere, ocean and continental hydrosphere, are combined with the operational IERS EOP prediction bulletin A to reduce the prediction error in the very first day and to improve the subsequent 90-day prediction by exploitation of the revised initial state and trend information. EAM functions derived from ECMWF short-range forecasts and corresponding LSDM and OMCT simulations can account for high-frequency mass variations within the geophysical fluids for up to 7 days into the future primarily limited by the accuracy of the forecasted atmospheric wind fields. Including these wide-band stochastic signals into the first days of the 90-day statistical IERS predictions reduces the mean absolute prediction error even for predictions beyond day 10, especially for polar motion, where the presently used prediction approach does not include geophysical fluids data directly. In a hindcast experiment using 1 year of daily predictions from May 2011 till July 2012, the mean prediction error in polar motion, compared to bulletin A, is reduced by 32, 12, and 3 % for prediction days 10, 30, and 90, respectively. In average, the prediction error for medium-range forecasts (30–90 days) is reduced by 1.3–1.7 mas. Even for UT1-UTC, where AAM forecasts are already included in IERS bulletin A, we obtain slight improvements of up to 5 % (up to 0.5 ms) after day 10 due to the additional consideration of oceanic angular momentum forecasts. The improved 90-day predictions can be generated operationally on a daily basis directly after the publication of the related IERS bulletin A product finals2000A daily. Numéro de notice : A2013-340 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0631-6 Date de publication en ligne : 17/03/2013 En ligne : https://doi.org/10.1007/s00190-013-0631-6 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32478
in Journal of geodesy > vol 87 n° 6 (June 2013) . - pp 567 - 577[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2013061 SL Revue Centre de documentation Revues en salle Disponible Impact of seasonal station motions on VLBI UT1 intensives results / Zinovy Malkin in Journal of geodesy, vol 87 n° 6 (June 2013)
[article]
Titre : Impact of seasonal station motions on VLBI UT1 intensives results Type de document : Article/Communication Auteurs : Zinovy Malkin, Auteur Année de publication : 2013 Article en page(s) : pp 505 - 514 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] déformation de la croute terrestre
[Termes IGN] erreur systématique
[Termes IGN] European VLBI network
[Termes IGN] interférométrie à très grande base
[Termes IGN] orientation de la Terre
[Termes IGN] positionnement par ITGB
[Termes IGN] station VLBI
[Termes IGN] variation saisonnièreRésumé : (Auteur) UT1 estimates obtained from the very long baseline interferometry (VLBI) Intensives data depend on the station displacement model used during processing. In particular, because of seasonal variations, the instantaneous station position during the specific intensive session differs from the position predicted by the linear model generally used. This can cause systematic errors in UT1 Intensives results. In this paper, we first investigated the seasonal signal in the station displacements for the 5 VLBI antennas participating in UT1 Intensives observing programs, along with the 8 collocated GPS stations. It was found that a significant annual term is present in the time series for most stations, and its amplitude can reach 8 mm in the height component, and 2 mm in horizontal components. However, the annual signals found in the displacements of the collocated VLBI and GPS stations at some sites differ substantially in amplitude and phase. The semiannual harmonics are relatively small and unstable, and for most stations no prevailing signal was found in the corresponding frequency band. Then two UT1 Intensives series were computed with and without including the seasonal term found in the previous step in the station movement model. Comparison of these series has shown that neglecting the seasonal station position variations can cause a systematic error in UT1 estimates, which can exceed 1us, depending on the observing program. Numéro de notice : A2013-338 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-013-0624-5 Date de publication en ligne : 24/02/2013 En ligne : https://doi.org/10.1007/s00190-013-0624-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32476
in Journal of geodesy > vol 87 n° 6 (June 2013) . - pp 505 - 514[article]Réservation
Réserver ce documentExemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 266-2013061 SL Revue Centre de documentation Revues en salle Disponible
Titre : Atmospheric effects on measurements of the Earth gravity field Type de document : Thèse/HDR Auteurs : Maria Karbon, Auteur Editeur : Vienne [Autriche] : Technische Universität Wien Année de publication : 2013 Collection : Geowissenschaftliche Mitteilungen, ISSN 1811-8380 num. 94 Importance : 150 p. Format : 21 x 30 cm Note générale : bibliographie
Diese Arbeit wurde an der Fakultät für Mathematik und Geoinformation der Technischen Universität Wien zur Erlangung des akademischen Grades einer Doktorin der technischen Wissenschaften eingereichtLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] correction atmosphérique
[Termes IGN] données GRACE
[Termes IGN] effet atmosphérique
[Termes IGN] gravimètre supraconducteur
[Termes IGN] marée terrestre
[Termes IGN] modèle mathématique
[Termes IGN] rotation de la Terre
[Termes IGN] surcharge atmosphérique
[Termes IGN] surcharge océaniqueIndex. décimale : 30.40 Géodésie physique Résumé : (auteur) Atmospheric pressure variations are one of the major sources of surface gravity perturbations. The varying atmosphere introduces two disturbing forces in the gravity signal, the so called direct effect or Newtonian attraction, where the measuring object is attracted by the atmospheric mass itself, and secondly the indirect effect or atmospheric loading, where the masses deform the Earth’s surface, what again influences the measured gravity signal due to the slightly changes gravity field. In satellite gravity missions such signals are referred to as aliasing. To eliminate them, the de- termination of accurate atmospheric gravity field coefficients (AGC) is indispensable. For the determination of AGC it is state of the art to use high resolution numerical weather models which take into account the time-variable three-dimensional distribution of the atmospheric mass. By subtracting the gravity spherical harmonics of the instantaneous atmosphere from the ones of a long term mean field, the residual gravity spherical harmonic series is obtained. It describes the deviation of the actual gravity field from the mean gravity field due to atmospheric mass variations. Ground based gravimetric measurements encounter the same difficulty of eliminating the disturbing signal introduced by the atmosphere. Superconducting gravimeters are usually corrected using the local air pressure, which reduces up to 90-95 % of the atmospheric signal. However, modern superconducting gravimeters require an even better atmospheric correction if small signals are to be identified. For this task the use of three-dimensional modeling of atmospheric mass attraction based on operational numerical weather models has shown promising results. Note de contenu : 1. Introduction
2. The gravity field of the Earth
3. Atmospheric effects on the gravity field of the Earth
4. Mathematical description of the de-aliasing model for GRACE and its validation
5. Atmospheric corrections for superconducting gravimeters
6. Conclusion and outlookNuméro de notice : 14939 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : Mathematik und Geoinformation : Wien : 2013 En ligne : http://www.ub.tuwien.ac.at/diss/AC07815618.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77497 PermalinkPermalinkZero-difference GPS ambiguity resolution at CNES–CLS IGS Analysis Center / Sylvain Loyer in Journal of geodesy, vol 86 n° 11 (November 2012)PermalinkAnalysis of 4 years (2002-2005) of laser data on Starlette, Stella and LAGEOS-1/2 satellites for stations coordinates and Earth orientations parameters (EOP) / Bachir Gourine in Bulletin des sciences géographiques, n° 27 (juin 2012)PermalinkIntroduction à l’astronomie de position / Jonathan Chenal (2012)PermalinkRobust determination of station positions and Earth orientation parameters by VLBI intra-technique combination / S. Böckmann (2012)PermalinkPermalinkITRF2008: an improved solution of the international terrestrial reference frame / Zuheir Altamimi in Journal of geodesy, vol 85 n° 8 (August 2011)PermalinkHigh-resolution atmospheric angular momentum functions related to Earth rotation parameters during CONT08 / Daniel Gambis in Journal of geodesy, vol 85 n° 7 (July 2011)PermalinkApplication des algorithmes génétiques à la recherche de sous-réseaux de stations de télémétrie laser / David Coulot in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)PermalinkRésultats récents du centre français GRGS d'analyse de données de télémétrie laser sur satellites / Florent Deleflie in Bulletin d'information scientifique et technique de l'IGN, n° 77 (avril 2011)PermalinkPermalinkPermalinkIntroduction à l’astronomie de position / Jonathan Chenal (2011)PermalinkPermalinkIDS contribution to ITRF2008 / Jean-Jacques Valette in Advances in space research, vol 46 n° 12 (15/12/2010)PermalinkRefining DORIS atmospheric drag estimation in preparation of ITRF2008 / Marie-Line Gobinddass in Advances in space research, vol 46 n° 12 (15/12/2010)PermalinkContributions 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)PermalinkGSFC DORIS contribution to ITRF2008 / Karine Le Bail in Advances in space research, vol 45 n° 12 (15/06/2010)PermalinkMantle dynamics, geoid, inertia and TPW since 120 Myr / Hélène Rouby in Earth and planetary science letters, vol 292 n° 3-4 (April 2010)Permalink