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Termes IGN > géomatique > géopositionnement > positionnement absolu > positionnement ponctuel précis
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Mouvements verticaux des marégraphes par GPS / Emmanuel Bardiere (2009)
Titre : Mouvements verticaux des marégraphes par GPS : installations, rattachements, traitements et analyses en soutien des actions de l'équipe ULR Type de document : Mémoire Auteurs : Emmanuel Bardiere, Auteur Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Année de publication : 2009 Importance : 96 p. Format : 21 x 30 cm Note générale : Bibliographie
Rapport de projet pluridisciplinaire, cycle des ingénieurs diplômés de l'ENSG 2ème année (IT2)Langues : Français (fre) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Bernese
[Termes IGN] déformation verticale de la croute terrestre
[Termes IGN] GAMIT
[Termes IGN] marégraphe
[Termes IGN] Matlab
[Termes IGN] positionnement ponctuel précis
[Termes IGN] rattachement de station
[Termes IGN] série temporelle
[Termes IGN] station GPS
[Termes IGN] temps réelIndex. décimale : PROJET Mémoires : Rapports de projet - stage des ingénieurs de 2e année Résumé : (Auteur) Ce rapport reprend différents aspects d'un stage réalisé au cours de l'été 2009 à l'Université de La Rochelle. Le laboratoire a en charge le suivi, l'entretien et l'installation de stations GPS conjointement à des marégraphes. Le but de l'installation de station GPS en relation avec des marégraphes est de permettre le suivi des mouvements verticaux. Ces mouvements sont aussi bien ceux de la croûte terrestre et des plaques continentales que des mouvements locaux. Par exemple, le quai qui sert du support au marégraphe peut s'affaisser ou se tasser. Aussi, ce rapport comprend des aspects allant des installations techniques de stations GPS aux méthodes mises en œuvre pour l'exploitation des mesures en passant par l'étude des divers modes de collectes des données en temps réel. Un ensemble de documents a été réalisé au cours de ce stage, ils figurent en annexes. Note de contenu : Introduction
1) Installation de nouvelles stations
1.1) Réalisations d'installations simples : aspect purement technique
Bâtiment ILE
Fort Enet/ Fort Boyard
Roscoff
1.2) Prise en charge des aspects administratifs / relationnels
Ile d'Aix
Fort Boyard
Port de La Palliée
2) Automatisation de la collecte des données GPS
2.1) Présentation des matériels et des intervenants
2.2) Solutions retenues
Solution court terme (fiche de vidage)
Solutions pérennes (réseau)
3) Traitements et analyses
Rattachement des zéros
Historique
GPS + Nivellement.
Les différentes méthodes de calcul
Comparaison des méthodes et résultats sur SETE
ConclusionNuméro de notice : 13859 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Mémoire de projet pluridisciplinaire Organisme de stage : Université de La Rochelle ULR Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=50169 Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13859-01 PROJET Livre Centre de documentation Travaux d'élèves Disponible 13859-02 PROJET Livre Centre de documentation Travaux d'élèves Disponible Precise point positioning with GPS: A new approach for positioning, atmospheric studies, and signal analysis / Rodrigo Figueiredo Leandro (2009)
Titre : Precise point positioning with GPS: A new approach for positioning, atmospheric studies, and signal analysis Type de document : Thèse/HDR Auteurs : Rodrigo Figueiredo Leandro, Auteur Editeur : Fredericton [Canada] : University of New Brunswick Année de publication : 2009 Collection : Technical report num. 267 Importance : 232 p. Format : 21 x 30 cm Note générale : bibliographie
Ph.D. dissertation, Department of Geodesy and Geomatics Engineering, University of New Brunswick, Fredericton, New Brunswick, CanadaLangues : Anglais (eng) Descripteur : [Termes IGN] bruit (théorie du signal)
[Termes IGN] erreur systématique
[Termes IGN] estimation statistique
[Termes IGN] horloge atomique
[Termes IGN] modèle atmosphérique
[Termes IGN] positionnement ponctuel précis
[Termes IGN] récepteur monofréquence
[Termes IGN] retard ionosphèrique
[Termes IGN] trajet multipleRésumé : (auteur) Precise Point Positioning (PPP) is one of the existing techniques to determine point coordinates using a GPS (Global Positioning System) receiver. In this technique observations collected by a single receiver are used in order to determine the three components of the coordinates, as well as other parameters, such as the receiver clock error and total neutral atmosphere delay. The PPP technique is the subject of this thesis. The idea is that PPP could be used not only for positioning, but for a number of different tasks, as GPS data analysis. The observation model used in this technique has to take into consideration a number of effects present on GPS signals, and observations are un-differenced (there are no differences between receivers or between satellites). This makes PPP a powerful data analysis tool which is sensible to a variety of parameters. When the observation model is designed for positioning, most of these parameters (e.g., satellite clocks) are used as known quantities, but in this research the observation model was modified and enhanced to develop a PPP package that can be used as a tool for determining other parameters rather than position, receiver clock error and neutral atmosphere delay. These estimated parameters include ionospheric delay, code biases, satellite clock errors, and code multipath plus noise. Existing neutral atmosphere delay models have also been studied in this thesis, and an enhanced model has been developed and has had its performance assessed. The development of the model is based on measured meteorological parameters, and the rationale of the model is established in order to make its use as practical as possible for users of positioning techniques, such as PPP. Note de contenu : 1. Introduction
1.1. Motivation
1.2. Objectives and contributions
1.3. Outline of the thesis
2. Precise Point Positioning and GPS Analysis and Positioning Software (GAPS)
2.1. A bit of history, and GAPS’s role in PPP research and development
2.2. The positioning observation model
2.3. Observations adjustment
2.4. Corrections
3. Ionospheric delay estimation filter
3.1. Introduction
3.2. Ionospheric delay estimation filter
3.3. Results analysis
3.4. Chapter remarks
4. Estimation of code biases by means of PPP
4.1. Introduction
4.2. PPP-based P1-C1 code bias estimation
4.3. PPP-based P2-C2 code bias estimation
4.5. Chapter remarks
5. Code multipath and noise estimation with PPP
5.1. Iono-free code multipath plus noise estimates
5.2. L1 and L2 code multipath plus noise estimates
5.3. Comparison with TEQC
5.4. Analysis of L2C code quality
5.5. Chapter remarks
6. Single-receiver satellite pseudo-clock estimation
6.1. Derivation of the satellite pseudo-clocks
6.2. An example of generation and use of satellite pseudo-clocks
6.3. Chapter remarks
7. Neutral Atmosphere prediction models for GNSS positioning
7.1. Introduction
7.2. UNB wide area models
7.3. UNB wide area model for North America – UNBw.na
7.4. UNBw.na validation with ray-traced delays
7.5. Chapter remarks
8. Conclusions and recommendationsNuméro de notice : 14901 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : Geodesy and Geomatics Engineering : University of New Brunswick : Canada : 2009 DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76787 Online precise point positioning: a new, timely service from Natural Resources Canada / Y. Mireault in GPS world, vol 19 n° 9 (September 2008)
[article]
Titre : Online precise point positioning: a new, timely service from Natural Resources Canada Type de document : Article/Communication Auteurs : Y. Mireault, Auteur ; P. Tetreault, Auteur ; François Lahaye, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 59 - 64 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] Canada
[Termes IGN] positionnement ponctuel précis
[Termes IGN] serveur web
[Termes IGN] temps réel
[Termes IGN] traitement de données GNSSRésumé : (Editeur) Meliora sequamur - let us strive to improve. The words that the Roman poet Virgil wrote some 2,000 years ago could well be the watchwords of those scientists and engineers who today work to improve the accuracy, coverage, and timeliness of GPS-based positioning. They are particularly appropriate for those seeking to improve the technique of precise point positioning or PPP. PPP is a single-receiver positioning technique just like conventional pseudorange-based positioning, which takes place inside a receiver. However, the similarity stops there. PPP uses the receiver's very precise undifferenced carrier-phase observations together with very precise (and accurate) satellite orbits and clocks to achieve positioning accuracies at the few centimeter level or better. And unlike differential techniques such as real-time kinematic (RTK) positioning, all of the physical phenomena affecting the measurements must be very accurately modeled. These include solid earth tides, ocean-tide loading, transmitting and receiving antenna phase-center offsets and variations, carrier-phase wind-up, relativistic effects, and so on. With differential techniques, such effects are greatly reduced and typically become insignificant, especially on short baselines. PPP can be used to process data collected at a fixed (static) site or along a trajectory in kinematic mode or a mixture of the two - "stop and go" PPP. Although introduced in the late 1990s, PPP has only become more commonplace in the past few years, thanks, in part, to continued PPP development in government and university research labs. Several PPP processors are even available online. The precise satellite orbits and clocks required are provided by the International GNSS Service (IGS) and its worldwide tracking network and analysis centers. These products are supplied with some latency resulting in PPP normally being used as a post-processing technique with observations being processed some time after they are collected. However, over the past year or so efforts have been made to reduce the latency of some high-precision products. In particular, the ultra-rapid orbit and clock product of the Geodetic Survey Division of Natural Resources Canada (NRCan) is now being produced with a delay of only 90 minutes. Coupled with NRCan's online PPP engine, it provides positioning accuracies almost as good as the IGS final product, which is only available with a delay of about two weeks. In this month's column, we take a look at this new, timely service from the Great White North. Copyright Questex Media Group Inc Numéro de notice : A2008-384 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29377
in GPS world > vol 19 n° 9 (September 2008) . - pp 59 - 64[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 067-08091 RAB Revue Centre de documentation En réserve L003 Disponible Resolution of GPS carrier-phase ambiguities in Precise Point Positioning (PPP) with daily observations / M. Ge in Journal of geodesy, vol 82 n° 7 (July 2008)
[article]
Titre : Resolution of GPS carrier-phase ambiguities in Precise Point Positioning (PPP) with daily observations Type de document : Article/Communication Auteurs : M. Ge, Auteur ; Gerd Gendt, Auteur ; Markus Rothacher, Auteur ; et al., Auteur Année de publication : 2008 Article en page(s) : pp 389 - 401 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] ambiguïté entière
[Termes IGN] double différence
[Termes IGN] mesurage de phase
[Termes IGN] positionnement par GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] résolution d'ambiguïté
[Termes IGN] simple différenceRésumé : (Auteur) Precise Point Positioning (PPP) has been demonstrated to be a powerful tool in geodetic and geodynamic applications. Although its accuracy is almost comparable with network solutions, the east component of the PPP results is still to be improved by integer ambiguity fixing, which is, up to now, prevented by the presence of the uncalibrated phase delays (UPD) originating in the receivers and satellites. In this paper, it is shown that UPDs are rather stable in time and space, and can be estimated with high accuracy and reliability through a statistical analysis of the ambiguities estimated from a reference network. An approach is implemented to estimate the fractional parts of the single-difference (SD) UPDs between satellites in wide- and narrow-lane from a global reference network. By applying the obtained SD-UPDs as corrections to the SD-ambiguities at a single station, the corrected SD-ambiguities have a naturally integer feature and can therefore be fixed to integer values as usually done for the double-difference ones in the network mode. With data collected at 450 stations of the International GNSS Service (IGS) through days 106 to 119 in 2006, the efficiency of the presented ambiguity-fixing strategy is validated using IGS Final products. On average, more than 80% of the independent ambiguities could be fixed reliably, which leads to an improvement of about 27% in the repeatability and 30% in the agreement with the IGS weekly solutions for the east component of station coordinates, compared with the real-valued solutions. Copyright Springer Numéro de notice : A2008-317 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-007-0187-4 En ligne : https://doi.org/10.1007/s00190-007-0187-4 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29310
in Journal of geodesy > vol 82 n° 7 (July 2008) . - pp 389 - 401[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 266-08061 RAB Revue Centre de documentation En réserve L003 Disponible 266-08062 RAB Revue Centre de documentation En réserve L003 Disponible Performance of GPS precise point positioning under conifer forest canopies / Erik Naesset in Photogrammetric Engineering & Remote Sensing, PERS, vol 74 n° 5 (May 2008)
[article]
Titre : Performance of GPS precise point positioning under conifer forest canopies Type de document : Article/Communication Auteurs : Erik Naesset, Auteur ; J.G. Gjevestad, Auteur Année de publication : 2008 Article en page(s) : pp 661 - 668 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement
[Termes IGN] antenne GPS
[Termes IGN] forêt
[Termes IGN] GPS en mode différentiel
[Termes IGN] mesurage de pseudo-distance
[Termes IGN] Pinophyta
[Termes IGN] positionnement par GPS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] précision du positionnement
[Termes IGN] troncRésumé : (Auteur) A 20-channel, dual-frequency GPS receiver collecting pseudorange and carrier phase observations was used as a stand-alone receiver to determine positional accuracy of 19 points under conifer tree canopies. The positions were determined utilizing precise satellite orbit and clock products from the International GNSS Service. The mean positional accuracy ranged from 0.27 to 0.88 m for an observation period of 120 minutes, and 0.95 to 3.48 m for 15 minutes. For the 15 minute observation period computed positions could not be found for 8 to 44 percent of the locations. Accuracy increased with decreasing forest stand density. Stand basal area (R2 = 0.11, p Numéro de notice : A2008-179 Affiliation des auteurs : non IGN Thématique : FORET/POSITIONNEMENT Nature : Article DOI : 10.14358/PERS.74.5.661 En ligne : https://doi.org/10.14358/PERS.74.5.661 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29174
in Photogrammetric Engineering & Remote Sensing, PERS > vol 74 n° 5 (May 2008) . - pp 661 - 668[article]Code single point positioning using nominal GNSS constellations (future perception) / Ashraf Farah in Artificial satellites. Planetary geodesy, vol 42 n° 3 (September 2007)PermalinkAssessment of long-range kinematic GPS positioning errors by comparison with airborne laser altimetry and satellite altimetry / X. Zhang in Journal of geodesy, vol 81 n° 3 (March 2007)PermalinkGPS time transfer: using precise point positioning for clock comparisons / François Lahaye in GPS world, vol 17 n° 11 (November 2006)PermalinkAirborne kinematic positioning using precise point positioning methodology / Yang Gao in Geomatica, vol 59 n° 1 (January 2005)PermalinkPermalinkPermalinkSymposium 1 Point positioning in marine geodesy, Symposium 2 Application of geodesy, photogrammetry and cartography in the petroleum industry / H. Henneberg (1983)PermalinkCampagne EDOC / F. Nouel (1975)Permalink