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Titre : GNSS kinematic position and velocity determination for airborne gravimetry Type de document : Thèse/HDR Auteurs : Kaifei He, Auteur Editeur : Postdam : GeoForschungsZentrum Postdam Année de publication : 2015 Collection : Scientific technical reports num. 15-04 Importance : 187 p. Format : 21 x 30 cm Note générale : bibliographie
zur Erlangung des akademischen Grades Doktor der Ingenieurwissenschaften – Dr.-Ing. – genehmigte DissertationLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] gravimétrie aérienne
[Termes IGN] positionnement cinématique
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] station de référence
[Termes IGN] vitesseMots-clés libres : GNSS, Kinematic Precise Positioning Airborne Gravimetry Least Squares Nuisance Parameter Elimination Two-way Kalman filter Receiver Clock Error Multiple Reference Stations Robust Estimation Multiple kinematic Stations A Priori Distance Constraint Common Troposphere Parameterization GNSS Integration Helmert’s Variance Components Estimation Doppler Velocity Determination GEOHALO HALO HALO_GNSS Résumé : (auteur) The Global Navigation Satellite System (GNSS) plays a significant role in the fields of airborne gravimetry. The objective of this thesis is to develop reliable GNSS algorithms and software for kinematic highly precise GNSS data analysis in airborne gravimetry. Based on the requirements for practical applications in airborne gravimetry and shipborne gravimetry projects, the core research and the contributions of this thesis are summarized. […] Note de contenu : 1 Introduction
2 GNSS Observations and Error Sources
3 Algorithms Developing and Quality Analysis for GNSS Kinematic Positioning
4 Kinematic Positioning Based on Multiple Reference Stations
5 Kinematic Positioning Based on Multiple Kinematic Stations
6 Kinematic Positioning Based on GNSS Integration
7 GNSS Velocity Determination Based on the Doppler Effect
8 Software Development and Application
9 Summary and Future WorkNuméro de notice : 16181 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : mémoire de docteur-ingénieur : sciences de l'ingénieur : Université technique de Berlin : 2015 DOI : 10.2312/GFZ.b103-15044 En ligne : https://doi.org/10.2312/GFZ.b103-15044 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75987 Juniperus phoenicea growing on cliffs: dendrochronology and wiggle-matching applied to the oldest trees in France / C. Mathaux (2015)
contenu dans TRACE - Tree Rings in Archaeology, Climatology and Ecology, Volume 13 / Rob Wilson (2015)
Titre : Juniperus phoenicea growing on cliffs: dendrochronology and wiggle-matching applied to the oldest trees in France Type de document : Article/Communication Auteurs : C. Mathaux, Auteur ; J. P. Mandin, Auteur ; J.-L. Edouard, Auteur ; et al., Auteur Editeur : Postdam : GeoForschungsZentrum Postdam Année de publication : 2015 Collection : Scientific technical reports Conférence : Dendrosymposium 2014 06/05/2014 10/05/2014 Aviemore Royaume-Uni OA Proceedings Importance : pp 76 - 81 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] dendrochronologie
[Termes IGN] juniperus phoeniceaRésumé : (auteur) [introduction] [...] In the French Mediterranean region, populations of this Juniper tree can also grow on vertical and exposed limestone cliffs. Larson et al. (1999, 2000) assigned to cliffs the property of supporting ancient, primary or virgin woodland. In such habitats, disturbances from humans are absent, due to inaccessibility. Trees also benefit of absence of fires, grazing and competition by more aggressive level-ground vegetation. On these cliffs, in the southeast of France, Juniperus phoenicea is adapted to extreme growing conditions where the main constraints are verticality and compact hard limestone constituting a strong mechanical stress on roots. Indeed it limits their growth and both nutrients and water supply in dry and warm conditions under Mediterranean climate. In addition to that, trees face sporadic rockfall. [...] Numéro de notice : C2015-001 Affiliation des auteurs : non IGN Thématique : FORET Nature : Communication DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75986 Documents numériques
en open access
Juniperus phoeniceaAdobe Acrobat PDF
Titre : TRACE - Tree Rings in Archaeology, Climatology and Ecology, Volume 13 : Proceedings of the DENDROSYMPOSIUM 2014 May 6th – 10th, 2014 in Aviemore, Scotland, UK Type de document : Actes de congrès Auteurs : Rob Wilson, Éditeur scientifique ; Gerhard Helle, Éditeur scientifique ; Holger Gärtner, Éditeur scientifique Editeur : Postdam : GeoForschungsZentrum Postdam Année de publication : 2015 Collection : Scientific technical reports num. 15-06 Conférence : Dendrosymposium 2014 06/05/2014 10/05/2014 Aviemore Royaume-Uni OA Proceedings Importance : 128 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Végétation
[Termes IGN] dendrochronologie
[Termes IGN] dendroécologie
[Termes IGN] dendrologie
[Termes IGN] dendrométrieRésumé : (auteur) This publication is a result of the 13th TRACE conference (Tree Rings in Archaeology, Climatology and Ecology) organized by the Department of Department of Earth and Environmental Sciences at the University of St Andrews on May 6th – 10th, 2014 in Aviemore, Scotland, UK. TRACE is an initiative of the ‘Association of Tree-Ring Research’ (ATR) and seeks to strengthen the network and scientific exchange of scientists and students involved in the study of tree rings. The annual conference provides a scientific platform for young scientists at the cutting edge of tree-ring science. Around 110 scientists working on tree-ring related topics participated in the conference coming from Belgium, Canada, Czech Republic, France, Germany, India, Netherlands Poland, Slovenia, Spain, Sweden, Switzerland, Taiwan, United Kingdom and the United States. The participants enjoyed about 100 presentations, divided almost equally between talks and posters, organized into six thematic sessions: “Climate”, “Ecology”, “Historical”, “Wood Anatomy”, “Isotopes” and “Tree- Response”. After review, 18 short papers are published in this volume, giving an overview of the wide spectrum of different fields covered at TRACE. Numéro de notice : 16277 Affiliation des auteurs : non IGN Thématique : FORET Nature : Actes DOI : 10.2312/GFZ.b103-15069 En ligne : https://doi.org/10.2312/GFZ.b103-15069 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75984 Documents numériques
en open access
16277 TRACEAdobe Acrobat PDFUpdating ESA’s Earth System Model for Gravity Mission Simulation Studies, 2. Comparison with the Original Model / I. Bergmann–Wolf (2014)
Titre de série : Updating ESA’s Earth System Model for Gravity Mission Simulation Studies, 2 Titre : Comparison with the Original Model Type de document : Rapport Auteurs : I. Bergmann–Wolf, Auteur ; Robert Dill, Auteur ; E. Forootan, Auteur ; et al., Auteur Editeur : Postdam : GeoForschungsZentrum Postdam Année de publication : 2014 Collection : Scientific technical reports num. 14-08 Importance : 60 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] calotte glaciaire
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] marée océanique
[Termes IGN] masse d'air
[Termes IGN] variabilitéRésumé : (auteur) The ability of any satellite gravity mission concept to monitor mass transport processes in the Earth system is typically tested well ahead of its implementation by means of various simulation studies. Those studies often extend from the simulation of realistic orbits and instrumental data all the way down to the retrieval of global gravity field solution time-series. Basic requirement for all these simulations are realistic representations of the spatio-temporal mass variability in the different sub-systems of the Earth, as a source model for the orbit computations. For such simulations, a suitable source model is required to represent (i) high-frequency (i.e., sub-daily to weekly) mass variability in the atmosphere and oceans, in order to realistically include the effects of temporal aliasing due to non-tidal high-frequency mass variability into the retrieved gravity fields. In parallel, (ii) low-frequency (i.e., monthly to interannual) variability needs to be modelled with realistic amplitudes, particularly at small spatial scales, in order to assess to what extent a new mission concept might provide further insight into physical processes currently not observable. The new source model documented here attempts to fulfil both requirements: Based on ECMWF’s recent atmospheric reanalysis ERA-Interim and corresponding simulations from numerical models of the other Earth system components, it offers spherical harmonic coefficients of the time-variable global gravity field due to mass variability in atmosphere, oceans, the terrestrial hydrosphere including the ice-sheets and glaciers, as well as the solid Earth. Simulated features range from sub-daily to multiyear periods with a spatial resolution of spherical harmonics degree and order 180 over a period of 12 years. In addition to the source model, a de-aliasing model for atmospheric and oceanic high-frequency variability with augmented systematic and random noise is required for a realistic simulation of the gravity field retrieval process, whose necessary error characteristics are discussed. The documentation is organized as follows: The characteristics of the updated ESM along with some basic validation are presented in Volume 1 of this report (Dobslaw et al., 2014). A detailed comparison to the original ESA ESM (Gruber et al., 2011) is provided in Volume 2 (Bergmann-Wolf et al., 2014), while Volume 3 (Forootan et al., 2014) contains a description of the strategy to derive a realistically noisy de-aliasing model for the high-frequency mass variability in atmosphere and oceans. Numéro de notice : 16183 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Rapport d'étude technique Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=75978 Documents numériques
en open access
16183 Updating ESA’s Earth System ModelAdobe Acrobat PDFBestimmung des Gesamtelektroneninhalts der Ionosphäre aus PRARE-Entfernungs- und Dopplerbeobachtungen / Frank Flechtner (2000)
Titre : Bestimmung des Gesamtelektroneninhalts der Ionosphäre aus PRARE-Entfernungs- und Dopplerbeobachtungen Titre original : [Détermination du contenu total en électrons de l'ionosphère à partir des observations de télémétrie doppler de PRARE] Type de document : Monographie Auteurs : Frank Flechtner, Auteur Editeur : Postdam : GeoForschungsZentrum Postdam Année de publication : 2000 Collection : Scientific technical reports num. 00/02 Importance : 135 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] données PRARE
[Termes IGN] ionosphère
[Termes IGN] positionnement par PRARE
[Termes IGN] teneur totale en électronsIndex. décimale : 30.84 Applications de géodésie spatiale à l'atmosphère Résumé : (Auteur) Since many years, geodetic and geophysical quantities such as satellite orbits, ground station coordinates, Earth rotation parameters or Earth gravity field models are determined using radio or optical signals transmitted between ground stations and satellites. Beside many other disruptive factors, microwave observations are influenced to a great extent by the spatial and temporal highly variable behaviour of the Ionosphere. This leads usually to a change in signal travel time, but may also cause the complete loss of the signal. The fundamental parameter which describes the condition of the ionosphere is the total electron content (TEC). Because the ionosphere is a dispersive medium, TEC can be determined by measuring the travel time difference between two simultaneously transmitted signals of different frequency. Therefore, the German satellite tracking system PRARE (Precise Range And Range Rate Equipment) on ESA's remote sensing satellite ERS2 is also operated on two coherent frequencies. Unique with PRARE is the fact that the ionospheric parameters can alternatively be calculated from quasisimultaneous independent range and doppler measurements of the PRARE space segment. This method is called Differenced Range Versus Integrated Doppler (DRVID) and makes use of the different refraction index of code and phase measurements in refractive media such as the ionosphere. After a short introduction to the subject of this thesis the main characteristics of the PRARE system are presented, followed by the description of the properties of the Earth's atmospheric layers under special consideration of the refractivity and the spatial and temporal variations of the ionosphere. This more general part is completed by a survey of the presently used methods and models for the derivation of TEC. The data preprocessing of PRARE range and doppler measurements is the basis to derive the PRARE typical DRVID method. It is shown that this procedure is suitable to precisely derive the TEC and to detect multipath on PRARE range observations caused by the solar array of ERS-2. Different ideas for the necessary relative and absolute calibration of PRARE TEC values are discussed and carried out using two global ionospheric models, IRI95 and CODEGIM. The following comparison of simultaneous PRARE DRVID data with each other and with independent twofrequency TOPEX/POSEIDON altimeter observations shows their high reliability and quality. It is shown that especially under increasing solar activity and by further extension of the PRARE ground tracking network over the oceans the singlefrequency ERS-2 altimeter observations can be improved by means of PRARE TEC measurements. Finally, as an additional result of the experience gained during this work, some concrete suggestions for improvement of the PRARE system in case of operation on future satellite missions are presented. Numéro de notice : 15049 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=55053 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 15049-01 30.84 Livre Centre de documentation Géodésie Disponible PermalinkPermalink
