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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 Global Positioning System, papers published in Navigation, volume 5 / Institute of navigation (1998)
Titre : Global Positioning System, papers published in Navigation, volume 5 Type de document : Monographie Auteurs : Institute of navigation, Auteur Editeur : Alexandria : Institute of Navigation Année de publication : 1998 Collection : Navigation Importance : 380 p. Format : 17 x 25 cm ISBN/ISSN/EAN : 978-0-936406-05-3 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] détection d'erreur
[Termes IGN] intégrité des données
[Termes IGN] mesurage de pseudo-distance
[Termes IGN] positionnement par GPS
[Termes IGN] Receiver Autonomous Integrity Monitoring
[Termes IGN] récepteur GPS
[Termes IGN] traitement de données GNSSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Numéro de notice : 27276 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=56350 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 27276-01 30.61 Livre Centre de documentation Géodésie Disponible
Titre : Recursive data processing for kinematic GPS surveying Type de document : Thèse/HDR Auteurs : Christian Tiberius, Auteur Editeur : Delft : Netherlands Geodetic Commission NGC Année de publication : 1998 Collection : Netherlands Geodetic Commission Publications on Geodesy, ISSN 0165-1706 num. 45 Importance : 247 p. Format : 21 x 29 cm ISBN/ISSN/EAN : 978-90-6132-265-8 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] compensation Lambda
[Termes IGN] contrôle qualité
[Termes IGN] correction du signal
[Termes IGN] double différence
[Termes IGN] fiabilité des données
[Termes IGN] GPS en mode cinématique
[Termes IGN] modèle mathématique
[Termes IGN] modèle stochastique
[Termes IGN] phase GPS
[Termes IGN] précision des mesures
[Termes IGN] traitement de données GNSSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (auteur) Through the concept of interferometry and using carrier phase measurements, relative positions can be determined very precisely with the Global Positioning System GPS. Carrier phase measurements are made by phase comparison of the generated and received carrier. Due to this technique, an unknown integer number of cycles (ambiguity) is involved in these measurements. Resolving the ambiguities is the key to precise GPS positioning. When the integer (double difference) ambiguities have been successfully resolved, the precision of the relative position is at the 1 cm level or better. The ambiguities are dealt with by the LAMBDA method, the Least-squares AMBiguity Decorrelation Adjustment method, which was introduced in 1993. It features a strict extension of standard least-squares to the integer domain and by the decorrelating reparametrization of the ambiguities, the integer estimation can be made very fast and efficiently. Ambiguity resolution is possible instantaneously, thus based on only one epoch of data, and hence truely On-The-Fly.
In kinematic GPS surveying, the roving receiver visits the locations to be surveyed. This set up allows a high productivity in collecting geometric information. It is convenient to obtain the results of the data processing already in the field while the survey is run, instead of at the home office one day later. In case of insufficient quality, corrective actions can then be taken immediately in the field. The data processing must therefore be recursive. As mechanization the Square Root Information Filter is applied. The SRIF allows estimation and quality control computations to be made in recursion and thus possibly in real-time, in close parallel with the gathering of the data. The quality control comprises the Detection, Identification and Adaptation of errors in the incoming data (outliers, cycle slips). By the DlA-procedure, the effect of the errors on the estimates for the unknown parameters of interest, the coordinates of the rover, is directly removed.
The data of three GPS measurement campaigns are processed and analysed. The quality, in terms of precision and reliability, of the coordinate estimators is considered for various measurement scenarios. Practical results, the positioning performance and the capability of resolving the ambiguities, are given for a kinematic experiment. In conclusion is kinematic GPS, as a measurement technique, very well suited for surveying applications.
The mathematical model for GPS surveying, or positioning in general, that is currently in use, turns out to be a rough one, and must be further sophisticated. It limits the receiver interdistance to the typical short baseline length (-10 km). Shortcomings of the functional model that show up, when high demands are put on the quality of the positioning results, are explored. Refinements of the functional model concern differential atmospheric delay parameters (ionospheric and tropospheric). In addition, (phase) multipath is still a matter of concern. GPS code and phase observables are extensively analysed; an inventory of refinements to the stochastic model is made, and includes elevation dependence, cross-correlation and mutual (channel) correlation.Numéro de notice : 66719 Affiliation des auteurs : non IGN Autre URL associée : Complément Thématique : POSITIONNEMENT Nature : Thèse étrangère DOI : sans En ligne : https://www.ncgeo.nl/downloads/45Tiberius_1.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61651 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 66719-01 30.61 Livre Centre de documentation Géodésie Disponible
Titre : High precision GPS processing in kinematic mode Type de document : Monographie Auteurs : Marc Cocard, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 1995 Collection : Geodätisch-Geophysikalische Arbeiten in der Schweiz, ISSN 0257-1722 num. 52 Importance : 140 p. Format : 21 x 30 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] données GPS
[Termes IGN] GPS en mode cinématique
[Termes IGN] mesurage de pseudo-distance
[Termes IGN] orbitographie
[Termes IGN] résolution d'ambiguïté
[Termes IGN] traitement de données GNSSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Résumé : (Auteur) This report deals with the calculation of highly accurate trajectories of moving vehicles, and of air planes in particular, from differential GPS measurements processed in the offline mode.
In the last few years the Global Positioning System (GPS) has become the most powerful navigation system worldwide. Although it was developed by the American Department of Defense (DoD) and is, therefore, primarily designated for military use, the number of civilian users is rapidly increasing from day to day. Based on satellite measurements, GPS allows instantaneous positioning accurate to within 100200 meters. [Remondi, 1984] bas shown that differential processing of phase measurements allows improvement of position accuracy to few centimeters. There are numerous applications for spatial trajectories calculated with such high quality accuracy: e.g. their integration in photogrammetric aerotriangulation allows considerable reduction of the number of control points on the ground. Also in airborne gravimetry new horizons are being opened by using GPS.
A software system for processing kinematic data in the offline mode has been developed. Its key features are presented first. A robust and flexible approach using simultaneously phase and codemeasurements in a differential way is used. For the computation the differences between the code and phase information, measured by the roving receiver as well as by a fixed reference receiver, are used in order to reduce the systematic errors, which affect both receivers in a similar way. The main differences between the phase and the code data are (a) noise (decimeters to meters for the code, millimeters for the phase) and (b) the unknown ambiguities in the phase measurements, which are known to be integer values. Processing is carried out in two steps: firstly a least squares adjustment is applied in order to determine the timeinvariant parameters, using the entire data set. Parameters which are considered as invariant are the ambiguities and the coordinates of the roving receiver during stationary periods. Next, the integer values of the ambiguities are determined. In a second step the trajectory is reprocessed by introducing the known ambiguities.
The key problem in obtaining highaccuracy trajectories consists in making reliable identification of the integervalued ambiguities. It is demonstrated that a conventional sigma dependent rounding strategy, commonly used in static applications, is still a useful tool in offline kinematic processing. In addition, a more powerful search strategy has been analyzed and simulations show that under ideal conditions the integer values of the ambiguities can be retrieved within one epoch worth of dualfrequency measurements. These simulated results have been validated by real data. With increasing distance between the roving and the reference receiver a stochastic modelling of the ionospheric path delay gave good results but also showed the limitation of instantaneous ambiguity resolution.
Using GPS data of good quality trajectories with an accuracy of a few centimeters were recovered. With increasing distance between rover and reference station (up to 100 kilometers), however, all ambiguities could not always be resolved and the quality of the resulting trajectories deteriorates to some decimeters. But even in this case it was possible to derive the velocity and acceleration of the aircraft with high accuracy from the coordinates.Numéro de notice : 12607 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie En ligne : https://www.sgc.ethz.ch/sgc-volumes/sgk-52.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54706 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 12607-01 30.61 Livre Centre de documentation Géodésie Disponible 12607-02 30.61 Livre Centre de documentation Géodésie Disponible New GPS measurement modeling techniques of orbit determination and precise kinematic positioning / M. Yang (1995)
Titre : New GPS measurement modeling techniques of orbit determination and precise kinematic positioning Type de document : Monographie Auteurs : M. Yang, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1995 Collection : Department of Geodetic Science and Surveying Reports num. 43 Importance : 150 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] GPS en mode cinématique
[Termes IGN] modèle stochastique
[Termes IGN] orbitographie
[Termes IGN] positionnement cinématique
[Termes IGN] positionnement par GNSS
[Termes IGN] propagation ionosphérique
[Termes IGN] triple différenceIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Numéro de notice : 67476 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=61780 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 67476-01 30.61 Livre Centre de documentation Géodésie Disponible GPS-Verfahren für den Nahbereich mit kurzen Beobachtungszeiten in Vermessung und Ortung / K. Sauermann (1993)PermalinkLissage des mesures GPS de pseudo-distance par mesure de phase, et application à l'orbitographie / J.F. Cretaux (1992)PermalinkOrbitographie des satellites GPS par la mesure de pseudo-distance / J.F. Cretaux (1991)PermalinkPremiers essais des récepteurs GPS Ashtech LD 12 au SHOM / H. Bisquay (1991)PermalinkUntersuchung zum rationellen Einsatz des GPS in kleinräumigen Netzen / H.J. Euler (1990)PermalinkGPS - network analysis / Wojciech Pachelski (1988)PermalinkPUMA / W. Lindlohr (1988)PermalinkComparaisons de temps par divers récepteurs du système GPS / Noëlle Ramamison (1986)PermalinkGPS orbit determination using the double difference phase observable / Gerhard Beutler (04/11/1985)PermalinkJournées luxembourgeoises de géodynamique, European working group on satellite radio positioning Satrape, Proceedings of the Second Satrape Meeting / Council of europe (1985)Permalink