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Global gravity field determination using the GPS measurements made onboard the low Earth orbiting satellite CHAMP / Lars Prange (2010)

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Titre :	Global gravity field determination using the GPS measurements made onboard the low Earth orbiting satellite CHAMP
Type de document :	Rapport
Auteurs :	Lars Prange, Auteur
Editeur :	Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse
Année de publication :	2010
Collection :	Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 81
Importance :	212 p.
Format :	21 x 30 cm
ISBN/ISSN/EAN :	978-3-908440-25-3
Note générale :	Bibliographie
Langues :	Anglais (eng)
Descripteur :	[Vedettes matières IGN] Géodésie physique [Termes IGN] champ de pesanteur terrestre [Termes IGN] données CHAMP [Termes IGN] données GPS [Termes IGN] Global Positioning System [Termes IGN] gravimétrie spatiale [Termes IGN] modèle de géopotentiel [Termes IGN] orbite basse [Termes IGN] orbitographie [Termes IGN] positionnement par GPS [Termes IGN] validation des données [Termes IGN] variation saisonnière
Index. décimale :	30.40 Géodésie physique
Résumé :	(Auteur) The major goal of this work was to to generate "the best possible" static CHAMP-only gravity field model using most of the openly available CHAMP data. Firstly we wanted to assess the full potential but also the limitations of CHAMP data and a CHAMP-like satellite mission for gravity field determination. Secondly we wanted to gain as much insight as possible in determining gravity fields (static and time variable) from space-based GNSS data in general, because several current and future satellite missions (dedicated to gravity field research, but also non-dedicated) equipped with GNSS receivers could benefit from improvements made here. We believe to have come close to achieving these goals by generating, validating, and publishing the static Earth gravity field models AIUB-CHAMPOIS, AIUB-CHAMP02S, and AIUB-CHAMP03S. Furthermore, the largest constituents of the seasonal gravity field variations could be retrieved from CHAMP data, as well. The Celestial Mechanics Approach (CMA) was successfully applied for gravity field determination.
Note de contenu :	1 Introduction 2 Measuring the Earth's gravity field 2.1 Terrestrial geodesy 2.2 Satellite geodesy 2.2.1 Optical observations 2.2.2 Microwave methods 2.2.3 Satellite Laser Ranging (SLR) 2.2.4 Satellite altimetry 2.2.5 High-low SST of CHAMP 2.2.6 Low-low SST with GRACE 2.2.7 Satellite gradiometry with GOCE 3 Orbit determination and gravity field recovery 3.1 Least squares adjustment 3.1.1 Basic concept 3.1.2 LSA techniques 3.2 Coordinate systems 3.2.1 Geocentric quasi-inertial system 3.2.2 Earth-fixed coordinate system 3.2.3 Satellite-fixed coordinate system 3.3 Satellite orbits 3.3.1 Dynamic orbits 3.3.2 Reduced-dynamic orbits 3.3.3 Kinematic orbits 3.4 The equation of motion 3.5 Spherical harmonic representation of the gravitational potential 3.6 Orbit and gravity field determination 3.6.1 Numerical integration of the primary equations 3.6.2 Numerical integration of the variational equations 4. Global Positioning System - GPS 4.1 History 4.2 Basic measurement principle 4.3 GPS orbit constellation and satellites 4.4 GPS signals 4.5 Modeling GPS observables 4.5.1 Observation equations 4.5.2 Observation differences 4.5.3 Linear combinations 4.6 The International GNSS Service (IGS) 4.7 Bernese GPS Software (BSW) 5 Data processing 5.1 Generation of the A1UB-CHAMP01S gravity field model 5.1.1 Data Screening 5.1.2 Gravity field recovery 5.1.3 The AIUB-CHAMP01S gravity field model 5.2 Generation of the AIUB-CHAMP02S gravity field model 5.2.1 GNSS model changes 5.2.2 GPS orbit reprocessing 5.2.3 GPS satellite clock reprocessing 5.2.4 CHAMP orbit determination 5.2.5 AIUB-CHAMP02S gravity field recovery 5.2.6 The AIUB-CHAMP02S gravity field model 5.3 Generation of the AIUB-CHAMP03S gravity field model 5.3.1 Estimation of high-rate GPS satellite clock corrections 5.3.2 CHAMP orbit determination 5.3.3 Data screening and gravity field recovery 5.3.4 The AIUB-CHAMP03S gravity field model 6 Studies and experiments 6.1 Studies related to A1UB-C11AMP01S 6.1.1 Orbit modeling with arc-specific parameters 6.1.2 Modeling of non-gravitational perturbations with dynamic force models 6.1.3 Accelerometer data 6.1.4 Simulation study 6.1.5 Observation weights . 6.1.6 Influence of the a priori gravity field model 6.1.7 Screening the kinematic positions 6.1.8 Quality variations in monthly gravity field solutions 6.1.9 Summary and discussion of the IUB-CHAMPOlS-related studies 6.2 Experiments related to AIUB-CI1AMP02S 6.2.1 The impact of GNSS model changes 6.2.2 Inconsistency in the low degree harmonics 6.2.3 Simulation study 6.2.4 Latitude dependency of the observation scenario 6.2.5 Summary and conclusion of the AIUB-CHAMP02S-related studies 6.3 Experiments related to AIUB-CHAMP03S .. 6.3.1 Influence of empirical PCV-models on gravity field recovery using CHAMP GPS data .. 6.3.2 Elevation-dependent weighting 6.3.3 Observation sampling 6.3.4 Inter-epoch correlations of kinematic positions 6.3.5 Position differences vs. positions 6.3.6 Impact of observations of eclipsing GPS satellites on CHAMP gravity field recovery ... 6.3.7 Temporal variations of the Earth's gravity field 6.3.8 Recovery of the low degree harmonics 6.3.9 Summary of the experiments related to AIUB-CHAMP03S 7 Gravity field validation 7.1 Validation methods 7.1.1 Formal errors 7.1.2 Comparison with other gravity field models 7.1.3 Comparison with ground data 7.1.4 Altimetry data 7.1.5 Orbit determination 7.2 Validation of AIUB-CHAMP01S 7.2.1 Internal validation . 7.2.2 External validation 7.3 Validation of AIUB-CHAMP02S 7.3.1 Internal validation 7.3.2 External validation 7.4 Validation of AIUB-CHAMP03S 7.4.1 Internal validation 7.4.2 External validation 8 Summary and conclusions
Numéro de notice :	10370
Affiliation des auteurs :	non IGN
Thématique :	POSITIONNEMENT
Nature :	Rapport de recherche
En ligne :	https://www.sgc.ethz.ch/sgc-volumes/sgk-81.pdf
Format de la ressource électronique :	URL
Permalink :	https://documentation.ensg.eu/index.php?lvl=notice_display&id=62409

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