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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