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Fast error analysis of continuous GNSS observations with missing data / M.S. Bos in Journal of geodesy, vol 87 n° 4 (April 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 4 (April 2013) . - pp 351 - 360 Titre : Fast error analysis of continuous GNSS observations with missing data Type de document : Article/Communication Auteurs : M.S. Bos, Auteur ; R. Fernandes, Auteur ; S. Williams, Auteur ; Luisa Bastos, Auteur Année de publication : 2013 Article en page(s) : pp 351 - 360 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] bruit (théorie du signal) [Termes IGN] classification par maximum de vraisemblance [Termes IGN] données GNSS [Termes IGN] matrice de covariance [Termes IGN] série temporelle [Termes IGN] traitement de données GNSS Résumé : (Auteur) One of the most widely used method for the time-series analysis of continuous Global Navigation Satellite System (GNSS) observations is Maximum Likelihood Estimation (MLE) which in most implementations requires O(n3) operations for n observations. Previous research by the authors has shown that this amount of operations can be reduced to O(n2) for observations without missing data. In the current research we present a reformulation of the equations that preserves this low amount of operations, even in the common situation of having some missing data. Our reformulation assumes that the noise is stationary to ensure a Toeplitz covariance matrix. However, most GNSS time-series exhibit power-law noise which is weakly non-stationary. To overcome this problem, we present a Toeplitz covariance matrix that provides an approximation for power-law noise that is accurate for most GNSS time-series. Numerical results are given for a set of synthetic data and a set of International GNSS Service (IGS) stations, demonstrating a reduction in computation time of a factor of 10–100 compared to the standard MLE method, depending on the length of the time-series and the amount of missing data. Numéro de notice : A2013-218 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0605-0 Date de publication en ligne : 02/12/2012 En ligne : https://doi.org/10.1007/s00190-012-0605-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32356 [article]

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266-2013041	SL	Revue	Centre de documentation	Revues en salle	Disponible

Gravity, geoid and space missions GGSM 2004, IAG international symposium, Porto, Portugal, August 30 - September 3, 2004 / Christopher Jekeli (2005)  

Public Titre : Gravity, geoid and space missions GGSM 2004, IAG international symposium, Porto, Portugal, August 30 - September 3, 2004 Type de document : Actes de congrès Auteurs : Christopher Jekeli, Éditeur scientifique ; Luisa Bastos, Éditeur scientifique ; J. Fernandes, Éditeur scientifique Editeur : Berlin, Heidelberg, Vienne, New York, ... : Springer Année de publication : 2005 Collection : International Association of Geodesy Symposia, ISSN 0939-9585 num. 129 Conférence : IAG 2004, GGSM international symposium Gravity, geoid and space missions 30/08/2004 03/09/2004 Porto Portugal Importance : 368 p. Format : 20 x 27 cm ISBN/ISSN/EAN : 978-3-540-26930-4 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] anomalie de pesanteur [Termes IGN] base de données topographiques [Termes IGN] champ de pesanteur terrestre [Termes IGN] géodynamique [Termes IGN] géoïde local [Termes IGN] géoïde terrestre [Termes IGN] gravimètre [Termes IGN] gravimétrie [Termes IGN] modèle de géopotentiel [Termes IGN] océanographie spatiale [Termes IGN] pesanteur terrestre Résumé : (Documentaliste) Ce document rassemble les communications présentées lors du symposium international de l'Association Internationale de Géodésie qui a eu lieu à Porto, du 30 août au 3 septembre 2004. Neuf sessions ont regroupé les présentations : le modèle de champ de pesanteur d'après des missions satellitaires ; l'instrumentation en gravimétrie aérienne et satellitaire ; la modélisation de geoïde régional ; la cartographie par radar et laser satellitaires ; les bases de données topographiques et la modélisationde pesanteur ; l'altimétrie satellitaire, l'océanographie et le géoïde ; l'instrumentation et les réseaux en gravimétrie terrestre et la géodynamique ; les variations temporelles de pesanteur ; les champs et modèles de pesanteur de planètes. Note de contenu : Session 1: Initial results from retracking and reprocessing the ERS-1 geodetic mission altimetry for gravity field purposes. / O.B. Andersen, P. Knudsen, P. A. M. Berry, E. L. Mathers, R. Trimmer, and S. Kenyan Space-borne gravimetry: determination of the time variable gravity field / P.N.A.M. Visser and E.J.O. Schrama Satellite clusters for future gravity field missions / N. Sneeuw and H.P. Schaub A Preliminary Gravitational Model to Degree 2160 / N.K. Pavlis, S.A. Holmes, S.C. Kenyan, D. Schmidt, and R. Trimmer Stochastic model validation of satellite gravity data: A test with CHAMP pseudo-observations / J.P. van Loon and J. Kusche Analysis of J2-Perturbed Relative Orbits for Satellite Formation Flying / C. Xu, R. Tsoi and N. Sneeuw GOCE Gravity Field Processing / R. Pail, W.-D. Schuh andM. Wermuth GRACE Gradiometer / MA. Sharifi and W. Keller Modelling the Earth's gravity field using wavelet frames / l. Panet, O. Jamet, M. Diament and A. Chambodut Numerical Velocity Determination and Calibration Methods for CHAMP Using the Energy Balance Approach / M. Weigelt and N. Sneeuw Upward Continuation of Ground Data for GOCE Calibration/Validation Purposes / K.I. Wolf and H. Denker Global Gravity Field Solutions Based on a Simulation Scenario of GRACE SST Data and Regional Refinements by GOCE SGG Observations / A. Bicker, T. Mayer-Guerr and K.H. Ilk Effect of geopotential model errors on the projection of GOCE gradiometer observables / Gy. Toth and L. Foldvary Comparison of some robust parameter estimation techniques for outlier analysis applied to simulated GOCE mission data / B. Kargoll Comparison of outlier detection algorithms for GOCE gravity gradients / J. Bouman, M. Kern, R. Koop, R. Pail, R. Haagmans and T. Preimesberger Using the EIGEN-GRACE02S Gravity Field to Investigate Defectiveness of Marine Gravity Data / Wolfgang Bosch Determination of gravity gradients from terrestrial gravity data for calibration and validation of gradiometric GOCE data / M. Kern and R. Haagmans Session 2: Evaluation of Airborne Gravimetry Integrating GNSS and Strapdown INS Observations / Ch. Kreye, G. W. Hein and B. Zimmermann Network Approach versus State-space Approach for Strapdown Inertial Kinematic Gravimetry / A. Termens and I. Colomina The Airborne Gravimeter CHEKAN-A at the Institute of Flight Guidance (IFF) / T. H. Stelkens-Kobsch Numerical investigation of downward continuation methods for airborne gravity data / I.N. Tziavos, V.D. Andritsanos, R. Forsberg andA.V. Olesen Session 3: Status of the European Gravity and GeoidProject EGGP / H. Denker, J.-P. Barriot, R. Barzaghi, R. Forsberg, J. Ihde, A. Kenyeres, U. Marti, I.N. Tziavos Merging a Gravimetric Model of the Geoid withGPS/Leveiling data : an Example in Belgium / H. Duquenne, M. Everaerts and P. Lambot The Antarctic Geoid Project: Status Report and Next Activities / Mirko Scheinert First Results from new High-precision Measurements of Deflections of the Vertical in Switzerland / A. Mutter, B. Burki, H.-G. Kahle, Ch. Hirt and U. Marti Error Propagation with Geographic Specificity for Very High Degree Geopotential Models / N.K. Pavlis andJ. Saleh Gravity Data Base Generation and Geoid Model Estimation Using Heterogeneous Data / G.S. Vergos, I.N. Tziavos and V.D. Andritsanos A new strategy for processing airborne gravity data / B.A. Alberts, R. Klees and P. Ditmar Multiresolution representation of a regional geoid from satellite and terrestrial gravity data / M. Schmidt, J. Kusche, J.P. van Loon, C.K. Shum, S.-C. Han and O. Fabert A Study on Two-boundary Problems in Airborne Gravimetry and Satellite Gradiometry / P. Holota and M. Kern Local Geoid Computation by the Spectral Combination Method / O. Gitlein, H. Denker and J. Muller On the incorporation of sea surface topography in establishing vertical control / G. Fotopoulos, I.N. Tziavos and M.G. Sideris A New Gravimetric Geoidal Height Model over Norway Computed by the Least-Squares Modification Parameters / H. Nahavandchi, A. Soltanpour and E. Nyrnes On the Accuracy of Vertical Deflection Measurements Using the High-Precision Digital Zenith Camera System TZK2-D / Ch. Hirt, B. Reese and H. Enslin TERRA: A feasibility study on local geoid determination in Bolivia with strapdown inertial airborne gravimetry / M. Gimenez, I. Colomina, J. J. Resales, M. Wis, C. C. Tscherning and E. Vdsquez Artificial Neural Network: A Powerful Tool for Predicting Gravity Anomaly from Sparse Data / A.R. Tierra and S.R.C. de Freitas Session 4: Photon Counting Airborne Laser Swath Mapping(PC-ALSM) / W. E. Carter, R. L. Shrestha, and K.C. Slatton Evaluation of SRTM3 and GTOPO30 Terrain Data in Germany / H. Denker Multiscale Estimation of Terrain Complexity Using ALSM Point Data on Variable Resolution Grids / K.C. Slatton, K. Nagarajan, V. Aggarwal, H. Lee, W. Carter and R. Shrestha Session 5: A comparison of different isostatic models applied to satellite gravity gradiometry / F. Wild and B. Heck Session 6: Spectral Analysis of Mean Dynamic Ocean Topography From the GRACE GGM01 Geoid / Z. Zhang and Y. Lu Interannual to decadal sea level change in south-western Europe from satellite altimetry and in-situ measurements / L. Fenoglio-Marc, E. Tel, M.J. Garcia and N. Kjaer Spacetime analysis of sea level in the North Atlantic from TOPEX/Poseidon satellite altimetry / S.M, Barbosa, M. J. Fernandes and M. E. Silva Mean Sea Level and Sea Level Variation Studies in the Black Sea and the Aegean / I.N. Tziavos, G.S. Vergos, V. Kotzev and L. Pashova Modelling Future Sea-level Change under Greenhouse Warming Scenarios with an Earth System Model of Intermediate Complexity / 0. Makarynskyy, M. Kuhn and W.E. Featherstone Crossover Adjustment of New Zealand Marine Gravity Data, and Comparisons with Satellite Altimetry and Global Geopotential Models / M.J. Amos, W.E. Featherstone and J. Brett Session 7: Results of the International Comparison of Absolute Gravimeters in Walferdange (Luxembourg) of November 2003 / Olivier Francis, Tonie van Dam, M. Amalvict, M. Andrade de Sousa, M. Bilker, R. Billson, G. D'Agostino, S. Desogus, R. Falk, A. Germak, O. Gitlein, D. Jonhson, F. KloppingJ. Kostelecky, B. Luck, J. Makinen, D. McLaughlin, E. Nunez, C. Origlia, V.Palinkas,P. Richard, E. Rodriguez, D. Ruess, D. Schmerge, S. Thies, L. Timmen, M. Van Camp, D. van Westrum and H. Wilmes A New Small Cam-Driven Absolute Gravimeter / J.E. Fatter and A.L. Vitouchkine Absolute Gravity Measurements in Australia and Syowa Station, Antarctica / Y. Fukuda, T. Higashi, S. Takemoto, S. Iwano, K. Dot, K. Shibuya, Y. Hiraoka, I. Kimura, H. McQueen and R. Govind Unified European Gravity Reference Network 2002 (UEGN02) - Status 2004 / G. Boedecker, O. Francis and A. Kenyeres Determination of gravity anomalies from torsion balance measurements / L. Volgyesi, G. Toth and G. Csapo Session 8: Decadal Ocean Bottom Pressure Variability and its Associated Gravitational Effects in a Coupled Ocean-Atmosphere Model / R.J. Bingham and K. Haines Gravity Changes in the Fennoscandian Uplift Area to be Observed by GRACE and Absolute Gravimetry / J. Mutter, L. Timmen, O. Gitlein and H. Denker Recovery of global time-variations of surface water mass by GRACE geoid inversion / G. Ramillien, A. Cazenave, Ch. Reigber, R. Schmidt and P. Sckwintzer Seasonal Gravity Field Variations from GRACE and Hydrological Models / O.B. Andersen, J. Hinderer, F. G. Lemoine Mass redistribution from global GPS timeseries and GRACE gravity fields: inversion issues / J. Kusche and E.J.O. Schrama The Fennoscandian Land Uplift Gravity Lines 1966-2003 / J Makinen, A. Engfeldt, B.C. Harsson, H. Ruotsalainen, G. Strykowski, T. Oja, D. Wolf Temporal Gravity Variations in GOCE Gradiometric Data / F. Jarecki, J. Mutter, S. Petrovic and P. Schwintzer Estimating GRACE Aliasing Errors / K.-W. Seo and C.R. Wilson Methods to Study Co-seismic Deformations Detectable by Satellite Gravity Mission GRACE / W. Sun and S. Okubo The gradiometric-geodynamic boundary value problem / Gy. Toth Relation between the geological conditions and vertical surface movements in the Pannonian basin / L. Volgyesi, G. Csapo and Z. Szabo Modelling gravity gradient variation due to water mass fluctuations / L. Volgyesi and G. Toth Numéro de notice : 13811 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Actes DOI : 10.1007/b138327 En ligne : https://doi.org/10.1007/b138327 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=34646

Contient

• Merging a gravimetric model of the geoid with GPS-leveling data: an example in Belgium / Henri Duquenne (01/08/2004)  
• Modelling the Earth’s gravity field using wavelet frames / Isabelle Panet (2005)  

Exemplaires(1)

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13811-01	CG2004	Livre	Centre de documentation	Congrès	Disponible

vol 294 n° 3-4 - September 1998 - Wegener: an interdisciplinary contribution to unraveling the geodynamics of the European and mediterranean area, selected papers from the 7th general assembly of the Wegener project, special commission 6, section 2 of the IAG (Bulletin de Tectonophysics) / Susanna Zerbini

Public [n° ou bulletin]  est un bulletin de Tectonophysics / Philippe Agard (1964 - )   Titre : vol 294 n° 3-4 - September 1998 - Wegener: an interdisciplinary contribution to unraveling the geodynamics of the European and mediterranean area, selected papers from the 7th general assembly of the Wegener project, special commission 6, section 2 of the IAG Type de document : Périodique Auteurs : Susanna Zerbini, Éditeur scientifique ; Luisa Bastos, Éditeur scientifique ; Hans-Peter Plag, Éditeur scientifique Année de publication : 1998 Conférence : Wegener 1996, 7th general assembly meeting 03/06/1996 07/06/1996 Porto Portugal Importance : 350 p. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] positionnement par GPS [Termes IGN] projet WEGENER [Termes IGN] tectonique Numéro de notice : 15970 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Numéro de périodique Permalink : https://documentation.ensg.eu/index.php?lvl=bulletin_display&id=27408 [n° ou bulletin]

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15970-01	30.82	Revue	Centre de documentation	Géodésie	Disponible