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Präzise Positionierung in regionalen GPS-Referenzstationsnetzen / Lambert Wanninger (2000)
Titre : Präzise Positionierung in regionalen GPS-Referenzstationsnetzen Titre original : [Positionnement de précision dans les réseaux régionaux de stations GPS] Type de document : Thèse/HDR Auteurs : Lambert Wanninger, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2000 Collection : DGK - C Sous-collection : Dissertationen num. 508 Importance : 68 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9556-4 Note générale : Bibliographie Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] correction atmosphérique
[Termes IGN] Europe centrale
[Termes IGN] phase GPS
[Termes IGN] positionnement par GPS
[Termes IGN] précision centimétrique
[Termes IGN] réseau géodésique permanent
[Termes IGN] station de référence
[Termes IGN] station GPS
[Termes IGN] station virtuelle
[Termes IGN] traitement de données GNSSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Auteur) Permanent GPS reference stations produce observation corrections to be used for cm-accurate relative positioning and they establish the connection to a geodetic reference frame. In order to supply observation corrections for larger areas at minimum costs, the number of reference stations should be as small as possible, but large enough to guarantee cm-accuracy. The solution lies in the precise modeling of the distance and direction dependent errors.
Error modeling based on GPS phase data requires fixing of the carrier phase ambiguities in the network of reference stations. It could be shown, both theoretically and with real observation data, that a two-dimensional linear interpolation algorithm yields mm-accurate corrections if the reference station distances do not exceed 100 km.
However, if regional scale disturbances exist in the ionosphere or in the troposphere, larger errors can be encountered. For the application in Central Europe, it is therefore recommended to limit the reference station distances to some 50 km.
The realization of this positioning concept is performed in two steps. In the first one, the observations of the reference stations are preprocessed and separated into observation correction of one base station and correction models for the distance and direction dependent errors. In the second step, virtual observations of a reference station at a selected position are calculated. They can then be used for the positioning of a rover receiver in baseline mode using existing software.
The processing of various test data sets showed that in Central Europe and with reference station distances of some 50 km, 1cm accurate horizontal coordinates could be obtained within a few minutes. Since the distance and direction dependent errors can almost completely be corrected, the necessary observation time at a rover site is mainly a function of the rover receiver's data quality.Numéro de notice : 46139 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=58472 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 46139-02 30.61 Livre Centre de documentation Géodésie Disponible 46139-01 30.61 Livre Centre de documentation Géodésie Disponible Regionale und globale Gravitationsfeldanalyse hochauflösender Satellitendaten mittels Mehrgitterverfahren / S. Rudolph (2000)
Titre : Regionale und globale Gravitationsfeldanalyse hochauflösender Satellitendaten mittels Mehrgitterverfahren Titre original : [Analyse du champ de gravitation régional et global des satellites à haute résolution grâce à des méthodes multi grilles] Type de document : Thèse/HDR Auteurs : S. Rudolph, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2000 Collection : DGK - C Sous-collection : Dissertationen num. 528 Importance : 76 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9567-0 Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] champ de gravitation
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] discrétisation
[Termes IGN] données GOCE
[Termes IGN] données GRACE
[Termes IGN] gradiométrie
[Termes IGN] lissage de données
[Termes IGN] poursuite de satelliteIndex. décimale : 30.42 Gravimétrie Résumé : (Auteur) This thesis investigates the use of multigrid methods in conjunction with gravity field recovery from satellite data. The applied methods represent not only very fast techniques for solving large and non-sparse equation systems, but also yield approximations of the gravity field on different discretization levels. This theme becomes more and more acute because of different dedicated satellite missions. They will provide almost globally distributed gravity field information of unprecedented resolution and precision. Therefore new strategies for using this information have to be developed.
In contrast to the methods based on spherical harmonics a parameterization with space-localizing base functions on a sequence of hierarchically chosen grids is used. The investigation of the unavoidable discretization errors follows. The observation equations in the case of satellite-to-satellite tracking as well as in the case of satellite gravity gradiometry are formulated. The estimation of the unknown coefficients leads to ill-conditioned and fully occupied normal equation systems. A regularization technique has to be applied in order to solve them using the multigrid methods. The transformations between the levels of discretization and the different smoothing operators are dealt with. These operators are compared in the convergence analysis and the dependence upon the ordering of the unknowns is demonstrated.
The gravity field recovery based on the developed methods is examined in simulations concerning the dedicated missions CHAMP, GRACE and GOCE. The global investigations in the case of GRACE show that the L-curve is a proper method for choosing the regularization parameter. In addition the CHAMP simulation demonstrates the effective use of this parameter determination procedure for iteration techniques. The combination of different discretization levels is a main feature of the developed method. Its application in the simulation concerning GOCE leads to a regional refinement, when the estimated gravity field of GRACE is used as a-priori information.Numéro de notice : 27823 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=56447 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 27823-01 30.42 Livre Centre de documentation Géodésie Disponible A semi-analytical approach to gravity field analysis from satellite observations / Nico Sneeuw (2000)
Titre : A semi-analytical approach to gravity field analysis from satellite observations Type de document : Thèse/HDR Auteurs : Nico Sneeuw, Auteur Mention d'édition : 1 Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2000 Collection : DGK - C Sous-collection : Dissertationen num. 527 Importance : 102 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9566-3 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse spectrale
[Termes IGN] orbite
[Termes IGN] pesanteur terrestre
[Termes IGN] satellite artificiel
[Termes IGN] transmission de donnéesIndex. décimale : 30.42 Gravimétrie Numéro de notice : 68819 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62018 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 68819-01 30.42 Livre Centre de documentation Géodésie Disponible Zur Entwicklung eines GPS-Programmsystems für Lehre und Tests unter besonderer Berücksichtigung der Ambiguity Function Methode / B. Zebhauser (2000)
Titre : Zur Entwicklung eines GPS-Programmsystems für Lehre und Tests unter besonderer Berücksichtigung der Ambiguity Function Methode Titre original : [Pour le développement d'un système de programme GPS pour l'apprentissage et les tests en considérant particulièrement la méthode de fonction d'ambiguïté] Type de document : Thèse/HDR Auteurs : B. Zebhauser, Auteur Mention d'édition : 1 Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 2000 Collection : DGK - C Sous-collection : Dissertationen num. 523 Importance : 123 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9562-5 Langues : Allemand (ger) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] correction ionosphérique
[Termes IGN] double différence
[Termes IGN] GPS en mode différentiel
[Termes IGN] logiciel libre
[Termes IGN] Matlab
[Termes IGN] mesurage de pseudo-distance
[Termes IGN] phase GPS
[Termes IGN] résolution d'ambiguïté
[Termes IGN] traitement de données GNSSIndex. décimale : 30.42 Gravimétrie Résumé : (Auteur) The processing of GPS data is daily business for surveyors. But they often lack the basics in observables, models and algorithms of the commercial software they use, and how to value the results. To give the possibility to face, research and learn from the relating problems, a modular software package was written in MatLab 5 - an interpreting mathematical language - that enables total access to the data, program source code and run time variables and by that allows own software extensions. As a significant feature it visualizes the results graphically. Restrictions were made in data processing by considering only one baseline, of short distance, with short observation times and an expectation of centimeter accuracy. The reason for that is the primary interest in the principles of absolute and relative positioning. Phenomena, effects and algorithms concerning these techniques are comprehensively documented. Examples of typical applications illustrate the diverse aspects of data processing and emphasizes the investigations, that were performed especially for the partially new design, the implementation and the validation of the Ambiguity Function Method for carrier phase processing. The advantage of that method is its independence of cycle slips and integer ambiguities. The unknown coordinates can be determined by a search in the gridded position space. Relevant parameters are the precision of the initial coordinates, the wavelength of the observable used, the volume of the search space around the initial position and its grid distance. The derivation of the method starts from the conventional approach. For evaluating the results plausibility checks and statistical measures are introduced. The implemented approach shows reliable and repeatable results only for baseline lengths up to some kilometers and only for dual frequency data that enable the forming of linear combinations from L1 and L2 earner phase observations - the so-called laning methods. The investigations lead to the conclusion that, when using the wide lane, a pseudorange DGPS solution is sufficient as initial position. Another linear combination with poor ionospheric noise did not succeed to give really better results at long baselines although it was expected so. An approach for deleting cycle slips in double differences by fixing coordinates, resulting from an ambiguity function processing, is considered. A processing strategy is proposed and remaining problems are discussed. The publication is completed by extensive references and a documentation of the freely available software. Numéro de notice : 27820 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=56444 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 27820-01 30.42 Livre Centre de documentation Géodésie Disponible Analytical and numerical methods in gravity field modelling of ideal and real masses / Dimitrios Tsoulis (1999)
Titre : Analytical and numerical methods in gravity field modelling of ideal and real masses Type de document : Thèse/HDR Auteurs : Dimitrios Tsoulis, Auteur Editeur : Munich : Bayerische Akademie der Wissenschaften Année de publication : 1999 Collection : DGK - C, ISSN 0065-5325 num. 510 Importance : 133 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-7696-9548-9 Note générale : Bibliographie
Thèse allemandeLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique
[Termes IGN] analyse de variance
[Termes IGN] champ de pesanteur terrestre
[Termes IGN] International Terrestrial Reference Frame
[Termes IGN] matrice de covariance
[Termes IGN] modèle mathématique
[Termes IGN] varianceIndex. décimale : 30.40 Géodésie physique Résumé : (Auteur) Based on Newton's law of gravitation, one can compute at arbitrary points in space the gravitational potential of a given mass distribution, as well as its first and second order derivatives. For a number of ideal bodies the solution of these computations can be given in closed analytical form or as series expansion. In particular for points situated outside the symmetry axes of ideal bodies the analytical solutions are very tedious. Expressions of this type find application especially for gravitational experiments in the laboratory or inside of satellites. For more complicated mass distributions, for example for a topographic terrain model, finite discretization of the masses into elementary blocks or twodimensional Fourier representation are employed. In order to avoid singularities a combination method for this latter case is proposed, where a biner part is computed by numerical integration and Fourier expansion is applied to the outer area. Note de contenu : 1 Introduction
2 Terrestrial Reference Systems
2.1 General Remarks on TRS
2.2 Datum Determination
2.3 Datum Transformation
2.4 Reference Frame Noise and STransformation
3 International Terrestrial Reference Frame
3.1 Historical Background
3.4 Mathematical Model
3.5 Stochastic Model
3.6 Normal Equations
3.7 Variance Component Estimation used in ITRF
3.8 Minimum Position Variance Investigation
3.9 Introduction of a Unique Reference Frame Noise
3.10 Combination Steps in the ITRF
4 Connection to ITRF
4.1 Connection to ITRF some Ideas and Concepts
4.2 Connecting by SevenParameter Transformation
4.3 Datum Information contained in aNetwork Solution
4.4 Spectral Analysis
4.5 Seven Parameter Transformation necessary?
5 Data and DataQuality Measures
5.1 Variance covariance Analysis
5.2 Data Analysis The Concepts
6 Data Analysis
6.1 Data Analysis
6.2 Influence on the Variance Component Estimation
6.3 Influence on the Seven Transformation Parameters
6.4 Influence on Transformed Point Positions
6.5 Final Transformation Concept
7 ConclusionNuméro de notice : 56580 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=52105 Réservation
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