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Apprendre le positionnement par GNSS avec le logiciel RTKLIB / Pierre Bosser (2014)
Titre : Apprendre le positionnement par GNSS avec le logiciel RTKLIB : Rappels et compléments sur les GNSS Type de document : Guide/Manuel Auteurs : Pierre Bosser , Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN (2012-) Année de publication : 2014 Importance : 102 p. Format : 21 x 30 cm Langues : Français (fre) Descripteur : [Termes IGN] BeiDou
[Termes IGN] coordonnées GNSS
[Termes IGN] données GNSS
[Termes IGN] format RINEX
[Termes IGN] Galileo
[Termes IGN] Global Orbitography Navigation Satellite System
[Termes IGN] Global Positioning System
[Termes IGN] instrumentation GNSS
[Termes IGN] mesurage de phase
[Termes IGN] positionnement par GNSS
[Termes IGN] RTKLIB
[Termes IGN] signal GNSS
[Vedettes matières IGN] Traitement de données GNSSIndex. décimale : 30.61 Systèmes de Positionnement par Satellites du GNSS Note de contenu : Objectifs
1 - Introduction au positionnement GNSS
2 - Signaux et mesures GNSS
3 - Erreurs sur les mesures GNSS
4 - Méthodes de positionnement
5 - Réseaux GNSS permanents
6 - Brève présentation des différents GNSS
7 - Systèmes d'acquisition pour le positionnement GNSS
8 - Description des données nécessaires pour une analyse GNSS
9 - Rappels et compléments GNSS : exercices
Solution des exercicesNuméro de notice : 21597 Affiliation des auteurs : ENSG (2012-2019) Thématique : POSITIONNEMENT Nature : Manuel de cours DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=90640 Réservation
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Titre : Blind tropospheric model for Austria Type de document : Mémoire Auteurs : Paoline Prevost, Auteur Editeur : Champs-sur-Marne : Ecole nationale des sciences géographiques ENSG Année de publication : 2014 Importance : 36 p. Format : 21 x 30 cm Note générale : bibliographie
Rapport de projet pluridisciplinaire, cycle Ingénieur 2e annéeLangues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] Autriche
[Termes IGN] correction troposphérique
[Termes IGN] données météorologiques
[Termes IGN] international GPS service for geodynamics
[Termes IGN] modèle numérique
[Termes IGN] propagation troposphérique
[Termes IGN] retard troposphérique
[Termes IGN] signal GNSS
[Termes IGN] station GNSS
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] traitement de données GNSS
[Termes IGN] traitement du signalIndex. décimale : PROJET Mémoires : Rapports de projet - stage des ingénieurs de 2e année Résumé : (auteur) Lors de la traversée de l’atmosphère, les signaux GNSS sont retardés. Ces retards peuvent être séparés en deux parties : la partie humide et l’autre dite hydrostatique (Saastamoinen, 1972). Ces délais peuvent être très importants, c’est pourquoi il est très important de savoir les modéliser. Pour cela, des modèles de correction troposphérique peuvent être utilisés. Le but de ce stage est de développer un modèle régional numérique de correction troposphérique pour l’Autriche. Une grille d’une très bonne résolution était nécessaire à cause des nombreuses régions montagneuses que comporte l’Autriche. Après avoir traité les données météorologiques pour les rendre utilisables dans nos calculs, les paramètres nécessaires aux calculs des deux parties du retard troposphérique ont été calculés comme suggéré dans (Nafisi, 2012) et (Pain, 2013). Puis, le délai total a été comparé pour trois stations IGS avec GPT2w, un modèle numérique mondial des corrections troposphériques également développé par l’université technologique de Vienne. Note de contenu : Introduction
1 Context
1.1 Technical definitions
1.1.1 Blind model
1.1.2 Zenith delay
1.2 The existing
1.3 Objectives
2 Method
2.1 Preparation of the data
2.1.1 Presentation of the data
2.1.2 Treatment of the data
2.2 Calculation of the parameters
2.2.1 Define the useful parameters
2.2.2 Harmonic decomposition – Least square calculation
3 Results
3.1 Internal validation
3.1.1 Pressure
3.1.2 Water vapor decrease factor
3.1.3 Hydrostatic mapping function coefficient
3.1.4 Temperature lapse rate
3.2 External validation
ConclusionNuméro de notice : 22178 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Mémoire de projet pluridisciplinaire Organisme de stage : Université Technique de Vienne Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=74681 Réservation
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22178 Blind tropospheric model for Austria_Prevost.pdfAdobe Acrobat PDF Cycle slips: Detection and correction using inertial aiding / Malek O. Karaim in GPS world, vol 25 n° 1 (January 2014)
[article]
Titre : Cycle slips: Detection and correction using inertial aiding Type de document : Article/Communication Auteurs : Malek O. Karaim, Auteur ; Tashfeen B. Karamat, Auteur ; Aboelmagd Noureldin, Auteur ; et al., Auteur Année de publication : 2014 Article en page(s) : pp 64 - 69 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale
[Termes IGN] centrale inertielle
[Termes IGN] erreur de phase
[Termes IGN] phase GPS
[Termes IGN] récepteur GPS
[Termes IGN] temps réelRésumé : (Auteur) A team of university researchers has developed a technique combining GPS receivers with an inexpensive inertial measuring unit to detect and repair cycle slips with the potential to operate in real time. Numéro de notice : A2014-033 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32938
in GPS world > vol 25 n° 1 (January 2014) . - pp 64 - 69[article]Réservation
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Titre : GNSS meteorology in spatially dense networks Type de document : Thèse/HDR Auteurs : Fabian Peter Hurter, Auteur Editeur : Zurich : Schweizerischen Geodatischen Kommission / Commission Géodésique Suisse Année de publication : 2014 Collection : Astronomisch-Geodätische Arbeiten in der Schweiz, ISSN 0025-6676 num. 91 Importance : 185 Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-908440-37-6 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale
[Termes IGN] Bernese
[Termes IGN] données GNSS
[Termes IGN] météorologie
[Termes IGN] propagation du signal
[Termes IGN] retard troposphérique zénithal
[Termes IGN] signal GNSS
[Termes IGN] station GNSS
[Termes IGN] station météorologique
[Termes IGN] teneur en vapeur d'eau
[Termes IGN] traitement du signalIndex. décimale : 30.84 Applications de géodésie spatiale à l'atmosphère Résumé : (auteur) Two basic products from GNSS meteorology have been investigated in detail: (a) the Zenith Total Delay (ZTD) and, (b) wet refractivity fields reconstructed from Zenith Wet Delays (ZWD).The thesis aims at quantifying the accuracies of GNSS-derived ZTDs and refractivities and at characterizing their temporal and spatial resolution. In a first study using operational radiosondes and Global Navigation Satellite System (GNSS) data from the Swiss meteorological station in Payerne, the following uncertainty figures are obtained: With respect to the radiosonde, the GNSS-derived ZTD has a 1–3mm dry bias. Annual systematic variations of the comparison are found to have an amplitude of 1–2 mm . Removal of most systematic effects from the GNSS minus radiosonde ZTD time series plus a thorough budget of the radiosonde uncertainties allows the derivation of the random GNSS uncertainties. In the winter half-year, the standard deviation is shown to be 2.5–3.5 mm , during the summer half-year we obtain 3.5–5.0 mm.
In a further study in the western part of Switzerland, wet refractivities have been derived on the basis of interpolated ZWDs from the Automatic GNSS Network for Switzerland (AGNES). The employed interpolation algorithm is termed least-squares collocation. It makes use of a deterministic function to describe the general parametric field and a correlation function describing the spatial and temporal correlations between the zenith wet delays. Corresponding wet refractivities show accuracies superior to results from tomographic reconstructions of a similar data set. Further inclusion of ground meteorological measurements of temperature and water vapour pressure im- prove the derived refractivities in the lowest 2 km of the troposphere. Radio occultations are added to the reconstruction. The data combination enables the extension of the radio occultation profiles down to the ground. It is also shown that the GNSS data largely contributes to the profile quality above the atmospheric boundary layer. Transformation of the wet refractivities to humidity values with temperature profiles from a radiometer in Payerne show accuracies of a similar order of mag nitude to those from numerical weather prediction analysis. Hence, application of the algorithm in nowcasting of rain or investigating boundary layer processes are envisaged.
The third part of the thesis investigates the results from a campaign network of 34 geodetic- grade receivers. They were deployed close to and around Zermatt (Switzerland) for one month in summer 2010. The stations were spaced at distances of a few kilometers from each other and at heights between 1600–3500 m above mean sea level. The mountainous region provides an excellent natural laboratory to investigate the influences affecting the accuracy of the ZTD. Additionally, the Alpine region is prone to small-scale fluctuations in the troposphere. Thus, the spatial and temporal variability of the ZTD has been investigated. The influences of satellite obstructions, antenna and receiver types and a number of processing strategies on the estimated ZTD are analysed and validated with measurements from radiosondes launched during the campaign. The analysis suggests that 1 hour temporal resolution should not be undercut for estimated ZTDs. A temporal resolution of 30 minutes introduces more noise without better following the tropospheric fluctuation. The horizontal variability observed in ZTDs indicates correlation scale lengths of a few kilometers. From comparison with radiosondes, the ZTD uncertainty is shown to have 4–6 mm standard deviation. Some stations show signs of systematic effects caused by multipath and low- quality antenna patterns. Through the GNSS-inherent negative correlation of height with zenith delay, both parameters are similarly affected by these systematic influences. The performance of the numerical weather prediction model COSMO-2 is characterized in terms of integrated atmospheric state. The analysis yields preliminary recommendations on the assimilation of zenith total path delays into weather models in regions of highly complex topography such as the Swiss Alps.Note de contenu : 1 Introduction
1.1 Review of GNSS meteorology
1.2 Potential synergies with other water vapour measurements . 1.3 Challenges in GNSS meteorology
1.4 Objectives and structure of the thesis
2 Theory
2.1 Refractivity and path delay in the atmosphere
2.2 Collocation with the software COMEDIE
2.3 Water vapour tomography software AWATOS2
3 Comparison of zenith path delays from GNSS and radiosonde measurements
3.1 Data description
3.2 Formal uncertainties of ZTD estimates from GNSS
3.3 Comparison of ZTDs
3.4 Influence of processing strategy on GNSS ZTDs
3.5 2nd and 3rd order ionospheric effects .
3.6 Comparison of ZWDs
3.7 Formal uncertainty of radiosonde-derived ZTDs
3.8 Derivation of random GNSS ZTD uncertainty
3.9 Correlation between GNSS heights and ZTDs
3.10 Discussion .
3.11 Conclusion .
4 Payerne profile study
4.1 Abstract
4.2 Introduction
4.3 Description of data sets
4.4 Processing
4.5 Results .
4.6 Discussion
4.7 Conclusions
5 Geodetic water vapor campaign in Zermatt
5.1 Data description and processing
5.2 Troposphere results
5.3 Conclusions
6 ConclusionsNuméro de notice : 12952 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère En ligne : http://www.sgc.ethz.ch/sgc-volumes/sgk-91.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76823 Réservation
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Titre : Improved convergence for GNSS precise point positioning Type de document : Thèse/HDR Auteurs : Simon Banville, Auteur Editeur : Fredericton [Canada] : University of New Brunswick Année de publication : 2014 Collection : Technical report num. 294 Importance : 293 p. Format : 21 x 30 cm Note générale : bibliographie
dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in the Department of Geodesy and Geomatics EngineeringLangues : Anglais (eng) Descripteur : [Termes IGN] ambiguïté entière
[Termes IGN] correction ionosphérique
[Termes IGN] erreur systématique
[Termes IGN] mesurage de phase
[Termes IGN] phase GNSS
[Termes IGN] positionnement ponctuel précis
[Termes IGN] précision centimétrique
[Termes IGN] signal GLONASS
[Termes IGN] teneur totale en électrons
[Vedettes matières IGN] Traitement de données GNSSRésumé : (auteur) The precise point positioning (PPP) methodology allows for cm-level positioning accuracies using a single GNSS receiver, through careful modelling of all error sources affecting the signals. Adoption of PPP in several applications is however muted due to the time required for solutions to converge or re-converge to their expected accuracy, which regularly exceeds 30 minutes for a moving receiver. In an attempt at solving the convergence issues associated with PPP, three aspects were investigated.
First, signal tracking interruptions are typically associated with integer discontinuities in carrier-phase measurements, often referred to as a cycle slips. A refined method for detecting and correcting cycle slips was thus developed, in which all error sources affecting the observations are either modelled or estimated. Application of this technique allows for instantaneous cycle-slip correction, meaning that continuous PPP solutions can be obtained even in the presence of short losses of lock on satellites.
Second, external information on the ionosphere allows for reduced convergence times, but consistency must be observed in the functional model. A new technique, termed integer levelling, was thus developed to generate ionospheric delay corrections compatible with PPP based on the decoupled-clock model. Depending on the inter-station distances in the network providing ionospheric corrections, instantaneous cm-level accuracies can be obtained in PPP.
Third, processing of GLONASS signals is more problematic than GPS due to frequency division multiple access, leading to inter-frequency carrier-phase and code biases. A novel approach for the estimation of such biases was then proposed and facilitates processing of mixed receiver types. It also allows for undifferenced GLONASS ambiguity resolution based on a heterogeneous network of stations, the first demonstration of such an approach, and therefore has the potential to further reduce PPP convergence times.
This research also emphasized potential benefits of integer-levelled observations for improved ionosphere monitoring. The main justifications for adopting this approach are: a reduction in the determination of slant total electron content errors, a simplification in the GLONASS processing strategy, its applicability in real time, and the generation of satellite biases required for the use of ionospheric constraints in PPP with ambiguity resolution.Note de contenu : CH. 1 INTRODUCTION
1.1 Background
1.2 Objectives, Methodology, and Contributions
1.3 Dissertation Outline
CH. 2 IMPROVING REAL-TIME KINEMATIC PPP WITH INSTANTANEOUS CYCLE-SLIP CORRECTION
2.1 Introduction
2.2 Time-Differenced Functional Model
2.3 Time-Differenced Adjustment Process
2.4 Cycle-Slip Correction Procedure
2.5 PPP Solution Update
2.6 Processing Results
2.7 Further Discussions
2.8 Summary, Conclusions, and Future Work
CH. 3 MITIGATING THE IMPACTS OF IONOSPHERIC CYCLE SLIPS ON GNSS OBSERVATIONS
3.1 Introduction
3.2 Cycle-Slip Detection and Estimation
3.3 Integer Least-Squares Theory
3.4 Stochastic Analysis
3.5 Experimental Results
3.6 Conclusion
CH. 4 MONITORING THE IONOSPHERE USING INTEGER-LEVELLED GPS MEASUREMENTS
4.1 Introduction
4.2 Standard Levelling Procedure
4.3 Integer-Levelling Procedure
4.4 Slant TEC Evaluation
4.5 VTEC Evaluation
4.6 Conclusion
CH. 5 GLOBAL AND REGIONAL IONOSPHERIC CORRECTIONS FOR FASTER PPP CONVERGENCE
5.1 Introduction
5.2 The Decoupled-Clock Model (DCM)
5.3 The Extended Decoupled-Clock Model (EDCM)
5.4 Integer Levelling
5.5 Analyzing the Accuracy of Slant Ionospheric Corrections
5.6 PPP with Global Ionospheric Corrections
5.7 Regional Ionospheric Corrections for PPP with Ambiguity Resolution
5.8 Conclusion
CH. 6 GLONASS AMBIGUITY RESOLUTION OF MIXED RECEIVER TYPES WITHOUT EXTERNAL CALIBRATION
6.1 Introduction
6.2 Defining Minimum Constraints
6.3 Datum Transformation
6.4 Estimation of GLONASS Inter-frequency Code Biases
6.5 Proof of Concept
6.6 Conclusion
CH. 7 CONCEPTS FOR UNDIFFERENCED GLONASS AMBIGUITY RESOLUTION
7.1 Introduction
7.2 Estimating Inter-Frequency Biases
7.3 Ambiguity Resolution in the Presence of Biases
7.4 Application of Concepts
7.5 Characteristics of IFCBs
7.6 Melbourne-Wübbena Satellite Biases
7.7 Conclusion
CH. 8 CONCLUSION
8.1 Summary
8.2 Recommendations
8.3 Putting it All TogetherNuméro de notice : 14916 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Thèse étrangère Note de thèse : PhD : Geodesy and Geomatics Engineering : University of New Brunswick : 2014 En ligne : http://www2.unb.ca/gge/Pubs/TR294.pdf Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76904 Precise position determination using a Galileo E5 single-frequency receiver / H. Toho Diessongo in GPS solutions, vol 18 n° 1 (january 2014)PermalinkIOV passes with flying colors / Marco Falcone in GPS world, vol 24 n° 12 (December 2013)PermalinkPermalinkNew horizons of GLONASS / Denis Lyskov in GPS world, vol 24 n° 12 (December 2013)PermalinkPrincipe de fonctionnement d'un géonavigateur / Serge Botton in XYZ, n° 137 (décembre 2013 - février 2014)PermalinkServe the World, benefit mankind: a system matures / Chengqi Ran in GPS world, vol 24 n° 12 (December 2013)PermalinkSingular spectrum analysis for modeling seasonal signals from GPS time series / Q. Chen in Journal of geodynamics, vol 72 (December 2013)PermalinkHunting for GNSS echoes: analysis of signal tracking techniques for multipath mitigation / Antonio Fernandez in GPS world, vol 24 n° 11 (November 2013)PermalinkNew structure for GLONASS nav message / Alexander Povalyaev in GPS world, vol 24 n° 11 (November 2013)PermalinkUrban positioning on a smartphone: real-time shadow matching using GNSS and 3D city models / Lei Wang in Inside GNSS, vol 8 n° 6 (November - December 2013)Permalink