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Review and principles of PPP-RTK methods / Peter J.G. Teunissen in Journal of geodesy, vol 89 n° 3 (March 2015)  

Public [article]  inJournal of geodesy > vol 89 n° 3 (March 2015) . - pp 217 - 240 Titre : Review and principles of PPP-RTK methods Type de document : Article/Communication Auteurs : Peter J.G. Teunissen, Auteur ; Amir Khodabandeh, Auteur Année de publication : 2015 Article en page(s) : pp 217 - 240 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] analyse comparative [Termes IGN] double différence [Termes IGN] estimateur [Termes IGN] méthode de mesure [Termes IGN] positionnement cinématique en temps réel [Termes IGN] positionnement ponctuel précis [Termes IGN] résolution d'ambiguïté Résumé : (auteur) PPP-RTK is integer ambiguity resolution-enabled precise point positioning. In this contribution, we present the principles of PPP-RTK, together with a review of different mechanizations that have been proposed in the literature. By application of S-system theory, the estimable parameters of the different methods are identified and compared. Their interpretation is essential for gaining a proper insight into PPP-RTK in general, and into the role of the PPP-RTK corrections in particular. We show that PPP-RTK is a relative technique for which the ‘single-receiver user’ integer ambiguities are in fact double-differenced ambiguities. We determine the transformational links between the different methods and their PPP-RTK corrections, thereby showing how different PPP-RTK methods can be mixed between network and users. We also present and discuss four different estimators of the PPP-RTK corrections. It is shown how they apply to the different PPP-RTK models, as well as why some of the proposed estimation methods cannot be accepted as PPP-RTK proper. We determine analytical expressions for the variance matrices of the ambiguity-fixed and ambiguity-float PPP-RTK corrections. This gives important insight into their precision, as well as allows us to discuss which parts of the PPP-RTK correction variance matrix are essential for the user and which are not. Numéro de notice : A2015-336 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0771-3 Date de publication en ligne : 13/11/2014 En ligne : https://doi.org/10.1007/s00190-014-0771-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76704 [article]

Assessing and mitigating the effects of the ionospheric variability on DGPS / Duojie Weng in GPS solutions, vol 19 n° 1 (January 2015)  

Public [article]  inGPS solutions > vol 19 n° 1 (January 2015) . - pp 107 - 116 Titre : Assessing and mitigating the effects of the ionospheric variability on DGPS Type de document : Article/Communication Auteurs : Duojie Weng, Auteur ; Shengyue Ji, Auteur ; Wu Chen, Auteur ; Zhihua Li, Auteur ; et al., Auteur Année de publication : 2015 Article en page(s) : pp 107 - 116 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] GPS en mode différentiel [Termes IGN] gradient ionosphèrique [Termes IGN] ionosphère [Termes IGN] modèle ionosphérique [Termes IGN] retard ionosphèrique [Termes IGN] traitement de données GNSS Résumé : (auteur) The differential GPS (DGPS) performance can be affected by the ionospheric variability, especially in low-latitude areas. We evaluated the behavior of the ionospheric variability in low-latitude areas in the 11-year cycle of the solar activity. During periods of solar maximum, the percentage of the daily maximum gradient that exceeds 50 mm/km has reached 73 % in 2001. Assuming that the baseline length is 20 km, the gradient larger than 50 mm/km can lead to more than 1.0-m ranging error, which is significant if we want to achieve meter-level accuracy with DGPS. An ionospheric gradient model built from a number of reference stations is proposed for estimating the differential ionospheric delays. The effectiveness of the model is demonstrated under both the quiet and active ionospheric conditions in low-latitude areas. For a short baseline length of 16.9 km in Hong Kong, the horizontal positioning accuracy can be improved by 41 and 61 % during active solar years and geomagnetic storms, respectively. The improvements show that the model is capable of reducing the spatial decorrelation caused by the ionospheric variability, and the model can be used in DGPS especially over the regions, such as low-latitude areas, where the large ionospheric variability happens frequently. Numéro de notice : A2015-201 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-014-0372-x Date de publication en ligne : 13/04/2014 En ligne : https://doi.org/10.1007/s10291-014-0372-x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76019 [article]

Extending the reach of SBAS : Some aspects of EGNOS performance in Ukraine / Valeriy Konin in Inside GNSS, vol 10 n° 1 (January - February 2015)  

Public [article]  inInside GNSS > vol 10 n° 1 (January - February 2015) Titre : Extending the reach of SBAS : Some aspects of EGNOS performance in Ukraine Type de document : Article/Communication Auteurs : Valeriy Konin, Auteur ; Fedir Shyshkov, Auteur Année de publication : 2015 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] European Geostationary Navigation Overlay Service [Termes IGN] fiabilité des données [Termes IGN] signal GNSS [Termes IGN] système d'extension [Termes IGN] Ukraine Résumé : (auteur) Although the European Geostationary Navigation Overlay Service is primarily designed to provide benefits from a space-based augmentation system that serves the European Union nations, it actually covers regions outside that geographic area. In this article, researchers tracking EGNOS signal availability in Ukraine conclude that its performance there is improving in robustness and reliability. Numéro de notice : A2015-255 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.insidegnss.com/node/4366 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76295 [article]

From Data Schemes to Supersonic Codes : GNSS Authentication for Modernized Signals / Oscar Pozzobon in Inside GNSS, vol 10 n° 1 (January - February 2015)  

Public [article]  inInside GNSS > vol 10 n° 1 (January - February 2015) Titre : From Data Schemes to Supersonic Codes : GNSS Authentication for Modernized Signals Type de document : Article/Communication Auteurs : Oscar Pozzobon, Auteur ; Giovanni Gamba, Auteur ; Matteo Canale, Auteur ; et al., Auteur Année de publication : 2015 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] authentification [Termes IGN] leurrage [Termes IGN] signal GNSS Résumé : (auteur) The problem of GNSS signal authentication is expected to draw ever more attention in an operational environment that poses a growing risk — and consequences — for “spoofing” attacks. A team of researchers present an overview of the requirements and methods for verifying the authenticity of the signals and introduce a novel scheme for authentication of open GNSS signals using supersonic codes. Numéro de notice : A2015-256 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans En ligne : http://www.insidegnss.com/node/4370 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76290 [article]

Accounting for Galileo–GPS inter-system biases in precise satellite positioning / Jacek Paziewski in Journal of geodesy, vol 89 n° 1 (January 2015)  

Public [article]  inJournal of geodesy > vol 89 n° 1 (January 2015) . - pp 81 - 93 Titre : Accounting for Galileo–GPS inter-system biases in precise satellite positioning Type de document : Article/Communication Auteurs : Jacek Paziewski, Auteur ; Pawel Wielgosz, Auteur Année de publication : 2015 Article en page(s) : pp 81 - 93 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] acquisition de données [Termes IGN] analyse comparative [Termes IGN] données GNSS [Termes IGN] double différence [Termes IGN] erreur systématique [Termes IGN] fusion de données [Termes IGN] positionnement différentiel [Termes IGN] signal Galileo [Termes IGN] signal GPS [Termes IGN] stabilité dans le temps Résumé : (auteur) Availability of two overlapping frequencies L1/E1 and L5/E5a of the signals transmitted by GPS and Galileo systems offers the possibility of tightly combining observations from both systems in a single observational model. A tightly combined observational model assumes a single reference satellite for all observations from both Galileo and GPS systems. However, when inter-system double-differenced observations are created, receiver inter-system bias is introduced. This study presents the results and the methodology for estimation and accounting for phase and code GPS-Galileo inter-system bias in precise relative positioning. The research investigates the size and temporal stability of the estimated bias for different receiver pairs as well as examines the influence of accounting for the inter-system bias on the user position solution. The obtained numerical results are based on four experiments carried out at different locations and time periods using both real and simulated GNSS data. Numéro de notice : A2015-329 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-014-0763-3 En ligne : https://doi.org/10.1007/s00190-014-0763-3 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=76654 [article]

First Galileo FOC satellite on the air: Will be employable for surveying, precise positionning, and geodesy / Peter Steingenberger in GPS world, vol 26 n° 1 (January 2015)  

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Géodésie multi-technique pour la surveillance haute fréquence de glissements de terrains / Pierre Boetzle (2015) 

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GOCE: assessment of GPS-only gravity field determination / Adrian Jäggi in Journal of geodesy, vol 89 n° 1 (January 2015)  

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GPS for land surveyors / Jan Van Sickle (2015)

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GPS time-variable seasonal signals modeling / Qiang Chen (2015)  

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Korrektur stationsabhängiger Fehler bei GNSS / Andreas Knöpfler (2015)  

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Laser ranging data analysis for a colocation campaign of French Transportable Laser Ranging System (FTLRS) in Tahiti / Xiaoni Wang in Journal of geodesy, vol 89 n° 1 (January 2015)  

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A novel approach for generating routable road maps from vehicle GPS traces / Jing Wang in International journal of geographical information science IJGIS, vol 29 n° 1 (January 2015)  

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BeiDou belongs to China, and to the World / Li Wang in GPS world, vol 25 n° 12 (décembre 2014)  

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Detecting discontinuities in GNSS coordinate time series with STARS: case study, the Bologna and Medicina GPS sites / Sara Bruni in Journal of geodesy, vol 88 n° 12 (December 2014)  

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Galileo looks ahead to early services / Anonyme in GPS world, vol 25 n° 12 (décembre 2014)  

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Global coseismic deformations, GNSS time series analysis, and earthquake scaling laws / Laurent Métivier in Journal of geophysical research : Solid Earth, vol 119 n° 12 (December 2014)  

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Assessment of observing time-variable gravity from GOCE GPS and accelerometer observations / Pieter N.A.M. Visser in Journal of geodesy, vol 88 n° 11 (November 2014)  

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A Realistic and Easy-to-Implement Weighting Model for GPS Phase Observations / Xiaoguang Luo in IEEE Transactions on geoscience and remote sensing, vol 52 n° 10 tome 1 (October 2014)  

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An enhanced strategy for GNSS data processing of massive networks / H. Chen in Journal of geodesy, vol 88 n° 9 (September 2014)  

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Big spatial data analytics / Colin Henderson in GEO: Geoconnexion international, vol 13 n° 8 (september 2014)

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Empirical modelling of site-specific errors in continuous GPS data / Michael Moore in Journal of geodesy, vol 88 n° 9 (September 2014)  

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IGS-MGEX, on prépare le terrain pour les sciences et techniques GNSS multi-constellation / Oliver Montenbruck in XYZ, n° 140 (septembre - novembre 2014) 

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La mesure du niveau de la mer par bouées GPS : l'expérience multi-capteurs de l'île d'Aix / Gaël André in XYZ, n° 140 (septembre - novembre 2014) 

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Mobilité : l'embarras du choix / Françoise de Blomac in DécryptaGéo le mag, n° 159 (01/09/2014)

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