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Future global SLR network evolution and its impact on the terrestrial reference frame / Alexander Kehm in Journal of geodesy, vol 92 n° 6 (June 2018)
[article]
Titre : Future global SLR network evolution and its impact on the terrestrial reference frame Type de document : Article/Communication Auteurs : Alexander Kehm, Auteur ; Mathis Blossfeld, Auteur ; Erricos C. Pavlis, Auteur ; Florian Seitz, Auteur Année de publication : 2018 Article en page(s) : pp 625 – 635 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] données TLS (télémétrie)
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] paramètres d'orientation de la Terre
[Termes IGN] télémétrie laser sur satelliteRésumé : (Auteur) Satellite laser ranging (SLR) is an important technique that contributes to the determination of terrestrial geodetic reference frames, especially to the realization of the origin and the scale of global networks. One of the major limiting factors of SLR-derived reference frame realizations is the datum accuracy which significantly suffers from the current global SLR station distribution. In this paper, the impact of a potential future development of the SLR network on the estimated datum parameters is investigated. The current status of the SLR network is compared to a simulated potential future network featuring additional stations improving the global network geometry. In addition, possible technical advancements resulting in a higher amount of observations are taken into account as well. As a result, we find that the network improvement causes a decrease in the scatter of the network translation parameters of up to 24%, and up to 20% for the scale, whereas the technological improvement causes a reduction in the scatter of up to 27% for the translations and up to 49% for the scale. The Earth orientation parameters benefit by up to 15% from both effects. Numéro de notice : A2018-152 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-017-1083-1 Date de publication en ligne : 09/11/2017 En ligne : https://doi.org/10.1007/s00190-017-1083-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=89765
in Journal of geodesy > vol 92 n° 6 (June 2018) . - pp 625 – 635[article]Separation of atmospheric, oceanic and hydrological polar motion excitation mechanisms based on a combination of geometric and gravimetric space observations / F. Göttl in Journal of geodesy, vol 89 n° 4 (April 2015)
[article]
Titre : Separation of atmospheric, oceanic and hydrological polar motion excitation mechanisms based on a combination of geometric and gravimetric space observations Type de document : Article/Communication Auteurs : F. Göttl, Auteur ; M. Schmidt, Auteur ; Florian Seitz, Auteur ; Mathis Blossfeld, Auteur Année de publication : 2015 Article en page(s) : pp 377 - 390 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] atmosphère terrestre
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] géodésie physique
[Termes IGN] masse d'eau
[Termes IGN] mouvement du pôle
[Termes IGN] océanographie spatiale
[Termes IGN] réseau de surveillance géophysique
[Termes IGN] rotation de la TerreRésumé : (auteur) The goal of our study is to determine accurate time series of geophysical Earth rotation excitations to learn more about global dynamic processes in the Earth system. For this purpose, we developed an adjustment model which allows to combine precise observations from space geodetic observation systems, such as Satellite Laser Ranging (SLR), Global Navigation Satellite Systems, Very Long Baseline Interferometry, Doppler Orbit determination and Radiopositioning Integrated on Satellite, satellite altimetry and satellite gravimetry in order to separate geophysical excitation mechanisms of Earth rotation. Three polar motion time series are applied to derive the polar motion excitation functions (integral effect). Furthermore we use five time variable gravity field solutions from Gravity Recovery and Climate Experiment to determine not only the integral mass effect but also the oceanic and hydrological mass effects by applying suitable filter techniques and a land–ocean mask. For comparison the integral mass effect is also derived from degree 2 potential coefficients that are estimated from SLR observations. The oceanic mass effect is also determined from sea level anomalies observed by satellite altimetry by reducing the steric sea level anomalies derived from temperature and salinity fields of the oceans. Due to the combination of all geodetic estimated excitations the weaknesses of the individual processing strategies can be reduced and the technique-specific strengths can be accounted for. The formal errors of the adjusted geodetic solutions are smaller than the RMS differences of the geophysical model solutions. The improved excitation time series can be used to improve the geophysical modeling. Numéro de notice : A2015-343 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0782-0 Date de publication en ligne : 18/12/2014 En ligne : https://doi.org/10.1007/s00190-014-0782-0 Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76715
in Journal of geodesy > vol 89 n° 4 (April 2015) . - pp 377 - 390[article]The 1st International workshop on the quality of geodetic observation and monitoring systems (QuGOMS'11) / Hansjörg Kutterer (2015)
Titre : The 1st International workshop on the quality of geodetic observation and monitoring systems (QuGOMS'11) : Proceedings of the 2011 IAG International Worshop, Munich, Germany, April 13-15, 2011 Type de document : Actes de congrès Auteurs : Hansjörg Kutterer, Éditeur scientifique ; Florian Seitz, Éditeur scientifique ; Hamza Alkhatib, Éditeur scientifique ; et al., Éditeur scientifique Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2015 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 140 Conférence : QuGOMS 2011, 1st IAG International workshop on the quality of geodetic observation and monitoring systems 13/04/2011 15/04/2011 Munich Allemagne Proceedings Springer Importance : 183 p. Format : 21 x 29 cm ISBN/ISSN/EAN : 978-3-319-10827-8 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] ajustement de paramètres
[Termes IGN] données géodésiques
[Termes IGN] méthode des moindres carrés
[Termes IGN] modèle d'incertitude
[Termes IGN] positionnement par géodésie spatiale
[Termes IGN] surveillanceIndex. décimale : CG2011 Actes de congrès en 2011 Note de contenu : PART 1 -- Uncertainty Modeling of Geodetic Data
- Modeling Data Quality Using Artificial Neural Networks / Ralf Laufer and Volker Schwieger
- Magic Square of Real Spectral and Time Series Analysis with an Application to Moving Average Processes / I Krasbutter, B Kargoll, and W-D Schuh
- Describing the Quality of Inequality Constrained Estimates / L Roese-Koerner, B Devaraju,W-D Schuh, and N Sneeuw
- GNSS Integer Ambiguity Validation Procedures: Sensitivity Analysis /J Wang and T Li
- Optimal Design of Deformation Monitoring Networks Using the Global Optimization Methods / M Yetkin and C Inal
PART 2 -- Theoretical Studies on Combination Strategies and Parameter Estimation
- Towards the Combination of Data Sets from Various Observation Techniques / M Schmidt, F Göttl, and R Heinkelmann
- On the Weighted Total Least Squares Solutions / X Fang and H Kutterer
- Integration of Observations and Models in a Consistent Least Squares Adjustment Model / A Heiker and H Kutterer
- Comparison of Different Combination Strategies Applied for the Computation of Terrestrial Reference Frames and Geodetic Parameter Series / Manuela Seitz
- W-Ratio Test as an Integer Aperture Estimator: Pull-in Regions and Ambiguity Validation Performance / T Li and J Wang
- Performing 3D Similarity Transformation Using theWeighted Total Least-Squares Method / J Lu, Y Chen, X Fang, and B Zheng
- Comparison of Spatial Analyzer and Different Adjustment Programs / C Herrmann, M Lösler, and H Bähr
PART 3 -- Recursive State-Space Filtering
- State-Space Filtering with Respect to Data Imprecision and Fuzziness / I Neumann and H Kutterer
- Unscented Kalman Filter Algorithm with Colored Noise and Its Application in Spacecraft Attitude Estimation / Lifen Sui, Zhongkai Mou, Yu Gan, and Xianyuan Huang
- Principles and Comparisons of Various Adaptively Robust Filters with Applications in Geodetic Positioning / Yuanxi Yang, Tianhe Xu, and Junyi Xu
- Alternative Nonlinear Filtering Techniques in Geodesy for Dual State and Adaptive Parameter Estimation / H Alkhatib
PART 4 -- Sensor Networks and Multi Sensor Systems in Engineering Geodesy
- Parametric Modeling of Static and Dynamic Processes in Engineering Geodesy / A Eichhorn
- Land Subsidence in Mahyar Plain, Central Iran, Investigated Using Envisat SAR Data / M Davoodijam, M Motagh, and M Momeni
- Recent Impacts of Sensor Network Technology on Engineering Geodesy / O Heunecke
- Design of Artificial Neural Networks for Change-Point Detection / H Neuner
- Spatial and Temporal Kinematics of the Inylchek Glacier in Kyrgyzstan Derived from Landsat and ASTER Imagery / M Nobakht, M Motagh, H.U Wetzel, and M.A Sharifi
- Response Automation in Geodetic Sensor Networks by Means of Bayesian Networks / S Horst, H Alkhatib, and H Kutterer
- Efficiency Optimization of Surveying Processes / Ivon Gösseln and H Kutterer
- Modeling and Propagation of Quality Parameters in Engineering Geodesy Processes in Civil Engineering / Jürgen Schweitzer and Volker Schwieger
PART 5 -- Multi-Mission Approaches with View to Physical Processes in the Earth System
- Completion of Band-Limited Data Sets on the Sphere / W-D Schuh, S Müller, and J.M BrockmannNuméro de notice : 15830 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes DOI : 10.1007/978-3-319-10828-5 En ligne : https://doi.org/10.1007/978-3-319-10828-5 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75494 ContientRéservation
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Code-barres Cote Support Localisation Section Disponibilité 15830-01 CG2011 Livre Centre de documentation Congrès Disponible Atmosphärische und ozeanische Einflüsse auf die Rotation der Erde - Nummerische Untersuchungen mit einem dynamischen Erdsystemmodell / Florian Seitz (2004)
Titre : Atmosphärische und ozeanische Einflüsse auf die Rotation der Erde - Nummerische Untersuchungen mit einem dynamischen Erdsystemmodell Titre original : [Influences atmosphérique et océanographique sur la rotation de la Terre : études numériques avec un modèle dynamique systémique de la Terre] Type de document : Thèse/HDR Auteurs : Florian Seitz, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2004 Collection : DGK - C Sous-collection : Dissertationen num. 578 Importance : 94 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-5017-4 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] atmosphère terrestre
[Termes IGN] circulation atmosphérique
[Termes IGN] circulation océanique
[Termes IGN] marée terrestre
[Termes IGN] modèle dynamique
[Termes IGN] moment cinétique atmosphérique
[Termes IGN] mouvement du pôle
[Termes IGN] océan
[Termes IGN] ondelette
[Termes IGN] rotation de la Terre
[Termes IGN] terme de Chandler
[Termes IGN] théorème de LiouvilleIndex. décimale : 30.40 Géodésie physique Résumé : (Auteur) Variations of Earth rotation are caused by a multitude of gravitational and geophysical processes in the Earth system. The largest effects are due to tidal deformations of the solid Earth and mass redistributions within the atmosphere and the oceans. In order to study the Earth's reaction on gravitational and geophysical excitations, the dynamic Earth system model DyMEG has been developed. It is based on the balance of angular momentum in the Earth system, which is described by the non-linear Liouville equation. The model is forced by consistent time series of variations of the Earth's tensor of inertia and relative angular momenta which are deduced from atmospheric and oceanic circulation models. In contrast to former investigations, the characteristics of the Earth's free polar motion (Chandler wobble) are not explicitly predetermined with respect to period and damping but reproduced by the model from geometrical and rheological parameters. Therefore the traditional analytical solution is not applicable, and the Liouville equation is solved numerically as an initial value problem. A sensitivity analysis of DyMEG reveals that the solution based on a Runge-Kutta method is reliable from an algorithmic point of view. However, the system is sensitive to the initial conditions of the integration and the rheological model parameters (Love numbers). Forced variations of Earth rotation due to atmospheric and oceanic excitations yield an effect on the free polar motion as rotational deformations of the solid Earth are regarded in DyMEG. Wavelet analyses of the resulting time series for polar motion show that the Chandler wobble from DyMEG is excited by the atmospheric and oceanic mass redistributions over more than two decades. The noise of the excitation series is found to contain sufficient energy to counteract the damping of the Chandler amplitude which is caused by friction. It is assumed that the noise is due to stochastic processes within the atmosphere (weather). The numerical results for polar motion and length-of-day variations from DyMEG are significantly related with geodetic observations. Depending on the quality of the excitations, the correlation coefficients between the model time series and observations amount to 0,99. In addition to the rotational variations, time series of the second degree spherical harmonic coefficients of the Earth's gravity field, which are directly linked to the tensor of inertia, are computed. The mean values of the respective coefficients are in good agreement with recent gravity models. However the validation of their temporal variations is limited as suitable observation time series are not yet available. Numéro de notice : 13278 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54957 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13278-01 30.40 Livre Centre de documentation Géodésie Disponible