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On the interoperability of IGS products for precise point positioning with ambiguity resolution / Simon Banville in Journal of geodesy, vol 94 n°1 (January 2020)  

Public [article]  inJournal of geodesy > vol 94 n°1 (January 2020) Titre : On the interoperability of IGS products for precise point positioning with ambiguity resolution Type de document : Article/Communication Auteurs : Simon Banville, Auteur ; Jianghui Geng, Auteur ; Sylvain Loyer, Auteur ; et al., Auteur Année de publication : 2020 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] horloge du satellite [Termes IGN] international GPS service for geodynamics [Termes IGN] interopérabilité [Termes IGN] longitude [Termes IGN] positionnement cinématique [Termes IGN] positionnement par GNSS [Termes IGN] positionnement ponctuel précis [Termes IGN] positionnement statique [Termes IGN] précision millimétrique [Termes IGN] résolution d'ambiguïté Résumé : (auteur) Techniques enabling precise point positioning with ambiguity resolution (PPP-AR) were developed over a decade ago. Several analysis centers of the International GNSS Service (IGS) have implemented such strategies into their software packages and are generating (experimental) PPP-AR products including satellite clock and bias corrections. While the IGS combines individual orbit and clock products as standard to provide a more reliable solution, interoperability of these new PPP-AR products must be confirmed before they can be combined. As a first step, all products are transformed into a common observable-specific representation of biases. It is then confirmed that consistency is only ensured by considering both clock and bias products simultaneously. As a consequence, the satellite clock combination process currently used by the IGS must be revisited to consider not only clocks but also biases. A combination of PPP-AR products from six analysis centers over a one-week period is successfully achieved, showing that alignment of phase clocks can be achieved with millimeter precision thanks to the integer properties of the clocks. In the positioning domain, PPP-AR solutions for all products show improved longitude estimates of daily static positions by nearly 60% over float solutions. The combined products generally provide equivalent or better results than individual analysis center contributions, for both static and kinematic solutions. Numéro de notice : A2020-150 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-019-01335-w Date de publication en ligne : 03/01/2020 En ligne : https://doi.org/10.1007/s00190-019-01335-w Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=94782 [article]

Precision GNSS for everyone: Precise positioning using raw GPS measurements from android smartphones / Simon Banville in GPS world, Vol 27 n° 11 (November 2016)

Public [article]  inGPS world > Vol 27 n° 11 (November 2016) . - pp 43 - 48 Titre : Precision GNSS for everyone: Precise positioning using raw GPS measurements from android smartphones Type de document : Article/Communication Auteurs : Simon Banville, Auteur ; Franck Van Diggelen, Auteur Année de publication : 2016 Article en page(s) : pp 43 - 48 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] Androïd [Termes IGN] positionnement par GPS [Termes IGN] précision du positionnement [Termes IGN] téléphone intelligent Résumé : (éditeur) In this month’s column, we take a look at some initial efforts to independently process smartphone measurements. How good are the results?. Numéro de notice : A2016-775 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=82466 [article]

Ionospheric modeling using GPS: Greater fidelity using a 3D approach / Wei Zhang in GPS world, vol 25 n° 2 (February 2014)

Public [article]  inGPS world > vol 25 n° 2 (February 2014) . - pp 59 - 65 Titre : Ionospheric modeling using GPS: Greater fidelity using a 3D approach Type de document : Article/Communication Auteurs : Wei Zhang, Auteur ; Attila Komjathy, Auteur ; Simon Banville, Auteur ; Richard B. Langley, Auteur Année de publication : 2014 Article en page(s) : pp 59 - 65 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement du signal [Termes IGN] données localisées 3D [Termes IGN] fonction orthogonale [Termes IGN] modèle ionosphérique [Termes IGN] signal GPS [Termes IGN] temps réel Résumé : (Auteur) In this month's column, we look at the performance of this 3D approach to modeling the ionosphere including times when the ionosphere is particularly interesting. Numéro de notice : A2014-096 Affiliation des auteurs : non IGN Thématique : IMAGERIE/POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33001 [article]

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Improved convergence for GNSS precise point positioning / Simon Banville (2014)  

Public 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 Engineering Langues : 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 GNSS Résumé : (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 Together Numéro 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

Mitigating the impact of ionospheric cycle slips in GNSS observations / Simon Banville in Journal of geodesy, vol 87 n° 2 (February 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 2 (February 2013) . - pp 179 - 193 Titre : Mitigating the impact of ionospheric cycle slips in GNSS observations Type de document : Article/Communication Auteurs : Simon Banville, Auteur ; R. Langley, Auteur Année de publication : 2013 Article en page(s) : pp 179 - 193 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] Canada [Termes IGN] données GNSS [Termes IGN] positionnement ponctuel précis [Termes IGN] propagation ionosphérique [Termes IGN] scintillation [Termes IGN] traitement de données GNSS Résumé : (Auteur) Processing of data from global navigation satellite systems (GNSS), such as GPS, GLONASS and Galileo, can be considerably impeded by disturbances in the ionosphere. Cycle-slip detection and correction thus becomes a crucial component of robust software. Still, dealing with ionospheric cycle slips is not trivial due to scintillation effects in both the phase and the amplitude of the signals. In this contribution, a geometry-based approach with rigorous handling of the ionosphere is presented. A detailed analysis of the cycle-slip correction process is also tackled by examining its dependence on phase and code noise, non-dispersive effects and, of course, the ionosphere. The importance of stochastic modeling in validating the integer cycle-slip candidates is emphasized and illustrated through simulations. By examining the relationship between ionospheric bias and ionospheric constraint, it is shown that there is a limit in the magnitude of ionospheric delay variation that can be handled by the cycle-slip correction process. Those concepts are applied to GNSS data collected by stations in northern Canada, and show that enhanced cycle-slip detection can lead to decimeter-level improvements in the accuracy of kinematic PPP solutions with a 30-s sampling interval. Cycle-slip correction associated with ionospheric delay variations exceeding 50 cm is also demonstrated, although there are risks with such a procedure and these are pointed out. Numéro de notice : A2013-100 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0604-1 Date de publication en ligne : 04/11/2012 En ligne : https://doi.org/10.1007/s00190-012-0604-1 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32238 [article]

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