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Constrained and network multi-receiver single-epoch RTK positioning / Mieczysław Bakula in Survey review, vol 52 n° 373 (July 2020)  

Public [article]  inSurvey review > vol 52 n° 373 (July 2020) . - pp 289 - 298 Titre : Constrained and network multi-receiver single-epoch RTK positioning Type de document : Article/Communication Auteurs : Mieczysław Bakula, Auteur Année de publication : 2020 Article en page(s) : pp 289 - 298 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Navigation et positionnement [Termes IGN] compensation par moindres carrés [Termes IGN] EUPOS [Termes IGN] instrumentation Trimble [Termes IGN] modèle mathématique [Termes IGN] positionnement cinématique en temps réel [Termes IGN] récepteur GNSS [Termes IGN] station de référence Résumé : (auteur) This work presents the concept of RTK positioning based on two or three rover GNSS receivers from two or three different reference stations. Additionally, detailed mathematical models of constrained least squares adjustments of RTK positioning based on two or three different RTK/GNSS receivers are presented. The models were tested on real RTK data using three rover Trimble RTK receivers and three reference stations of the ASG-EUPOS system. Practical calculations obtained from the adjustments showed improved accuracy over traditional RTK positioning when reference GNSS stations were located far away (about 30 km from the mobile RTK receivers). The maximum average absolute error for horizontal and vertical coordinates in constrained RTK positioning was over two times lower than in the single baseline RTK positioning, and reached 0.021 and 0.046 m, respectively. Since the concept of constrained and redundant, single-epoch RTK adjustment can be used for static or kinematic applications in real-time positioning, it can also be widely used in geoscience surveying and remote sensing. Numéro de notice : A2020-376 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1080/00396265.2018.1547532 Date de publication en ligne : 28/11/2018 En ligne : https://doi.org/10.1080/00396265.2018.1547532 Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=95352 [article]

Geometric accuracy of topographical objects at Polish topographic maps / Radzym Lawniczack in Geodesy and cartography, vol 65 n° 1 (June 2016)  

Public [article]  inGeodesy and cartography > vol 65 n° 1 (June 2016) . - pp 55 - 66 Titre : Geometric accuracy of topographical objects at Polish topographic maps Type de document : Article/Communication Auteurs : Radzym Lawniczack, Auteur ; Jaroslaw Kubiak, Auteur Année de publication : 2016 Article en page(s) : pp 55 - 66 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Bases de données localisées [Termes IGN] analyse diachronique [Termes IGN] carte topographique [Termes IGN] coordonnées GPS [Termes IGN] données vectorielles [Termes IGN] EUPOS [Termes IGN] lac [Termes IGN] objet cartographique [Termes IGN] objet géographique [Termes IGN] Pologne [Termes IGN] précision de localisation [Termes IGN] précision des données Résumé : (Auteur) The objective of research concerned verifying the accuracy of the location and shape of selected lakes presented on topographical maps from various periods, drawn up on different scales. The area of research covered lakes situated in North-Western Poland on the Międzychód-Sieraków Lakeland. An analysis was performed of vector maps available in both analogue and digital format. The scales of these studies range from 1:50 000 to 1:10 000. The source materials were current for the years 1907 through 2013. The shape and location of lakes have been verified directly by means of field measurements performed using the GPS technology with an accuracy class of RTK. An analysis was performed of the location and shape of five lakes. The analysed water regions were vectorised, and their vector images were used to determine quantitative features: the area and length of the shoreline. Information concerning the analysed lakes obtained from the maps was verified on the basis of direct field measurements performed using a GPS RTK receiver. Use was made of georeferential corrections provided by the NAVGEO service or a virtual reference station generated by the ASG EUPOS system. A compilation of cartographic and field data formed the basis for a comparison of the actual area and the length of the shoreline of the studied lakes. Cartographic analyses made it possible to single out the most reliable cartographic sources, which could be used for the purposes of hydrographical analyses. The course of shorelines shows the attached map. Numéro de notice : A2016-637 Affiliation des auteurs : non IGN Thématique : GEOMATIQUE Nature : Article DOI : 10.1515/geocart-2016-0003 En ligne : http://dx.doi.org/10.1515/geocart-2016-0003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=81840 [article]

Spatio-temporal filtering for determination of common mode error in regional GNSS networks / Janusz Bogusz in Open geosciences, vol 7 n° 1 (January 2015)  

Public [article]  inOpen geosciences > vol 7 n° 1 (January 2015) . - pp 140 - 148 Titre : Spatio-temporal filtering for determination of common mode error in regional GNSS networks Type de document : Article/Communication Auteurs : Janusz Bogusz, Auteur ; Maciej Gruszczynski, Auteur ; Mariusz Figurski, Auteur ; Anna Klos, Auteur Année de publication : 2015 Article en page(s) : pp 140 - 148 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] erreur de positionnement [Termes IGN] EUPOS [Termes IGN] filtrage spatiotemporel [Termes IGN] Pologne [Termes IGN] positionnement par GNSS [Termes IGN] série temporelle Résumé : (auteur) The spatial correlation between different stations for individual components in the regional GNSS networks seems to be significant. The mismodelling in satellite orbits, the Earth orientation parameters (EOP), largescale atmospheric effects or satellite antenna phase centre corrections can all cause the regionally correlated errors. This kind of GPS time series errors are referred to as common mode errors (CMEs). They are usually estimated with the regional spatial filtering, such as the "stacking". In this paper, we show the stacking approach for the set of ASG-EUPOS permanent stations, assuming that spatial distribution of the CME is uniform over the whole region of Poland (more than 600 km extent). The ASG-EUPOS is a multifunctional precise positioning system based on the reference network designed for Poland. We used a 5- year span time series (2008-2012) of daily solutions in the ITRF2008 from Bernese 5.0 processed by the Military University of Technology EPN Local Analysis Centre (MUT LAC). At the beginning of our analyses concerning spatial dependencies, the correlation coefficients between each pair of the stations in the GNSS network were calculated. This analysis shows that spatio-temporal behaviour of the GPS-derived time series is not purely random, but there is the evident uniform spatial response. In order to quantify the influence of filtering using CME, the norms L1 and L2 were determined. The values of these norms were calculated for the North, East and Up components twice: before performing the filtration and after stacking. The observed reduction of the L1 and L2 norms was up to 30% depending on the dimension of the network. However, the question how to define an optimal size of CME-analysed subnetwork remains unanswered in this research, due to the fact that our network is not extended enough. Numéro de notice : A2015-439 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/geo-2015-0021 En ligne : https://doi.org/10.1515/geo-2015-0021 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=77039 [article]

EUPOS® – An International Initiative towards GNSS-based Positioning Infrastructure for Central and Eastern Europe / Jaroslav Simek in ZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement, vol 139 n° 5 (September - Oktober 2014)

Public [article]  inZFV, Zeitschrift für Geodäsie, Geoinformation und Landmanagement > vol 139 n° 5 (September - Oktober 2014) . - pp 316-323 Titre : EUPOS® – An International Initiative towards GNSS-based Positioning Infrastructure for Central and Eastern Europe Type de document : Article/Communication Auteurs : Jaroslav Simek, Auteur ; Artur Oruba, Auteur Année de publication : 2014 Article en page(s) : pp 316-323 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] Allemagne [Termes IGN] EUPOS [Termes IGN] positionnement par GNSS [Termes IGN] réseau géodésique permanent Index. décimale : 30.10 Systèmes de référence et réseaux géodésiques Résumé : (auteur) EUPOS® (European Position Determination System, see www.eupos.org) is an international organization of European public institutions related to the development and maintenance of real-time GNSS services. The most important task of EUPOS® is to support the realization and maintenance of precise national positioning services based on dense national active GNSS networks. EUPOS® members had elaborated commonly defined standards, which then were offered for implementation in the national positioning services. Those standards are necessary to maintain homogeneous high quality services and seamless cross-border applications. EUPOS® promotes those standards to countries, where the establishment of GNSS production networks is planned or it is on the way. Another important task of EUPOS® is to represent the members in international bodies and also act for the common interests in international bodies such as RTCM (Radio Technical Commission for Maritime Services) or ICG (International Committee on GNSS). The current EUPOS® members come mainly from Central and Eastern Europe, but EUPOS® has connections to Central Asian countries as well. However EUPOS® is willing to attract more European members and willing to establish a common discussion forum for all GNSS service providers. Numéro de notice : A2014-390 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=73852 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
199-2014051	RSREV	Revue	Centre de documentation	Revues en salle	Disponible

Near real-time estimation of water vapour in the troposphere using ground GNSS and the meteorological data / Jaroslaw Bosy in Annales Geophysicae, vol 30 n° 9 (September 2012)  

Public [article]  inAnnales Geophysicae > vol 30 n° 9 (September 2012) . - 13 p. ; pp 1379 - 1391 Titre : Near real-time estimation of water vapour in the troposphere using ground GNSS and the meteorological data Type de document : Article/Communication Auteurs : Jaroslaw Bosy, Auteur ; J. Kaplon, Auteur ; Witold Rohm, Auteur ; et al., Auteur Année de publication : 2012 Article en page(s) : 13 p. ; pp 1379 - 1391 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] données météorologiques [Termes IGN] EUPOS [Termes IGN] modèle atmosphérique [Termes IGN] Pologne [Termes IGN] propagation troposphérique [Termes IGN] surveillance météorologique [Termes IGN] teneur en vapeur d'eau [Termes IGN] tomographie Résumé : (Auteur) The near real-time (NRT) high resolution water vapour distribution models can be constructed based on GNSS observations delivered from Ground Base Augmentation Systems (GBAS) and ground meteorological data. Since 2008 in the territory of Poland, a GBAS system called ASGEUPOS (Active Geodetic Network) has been operating. This paper addresses the problems concerning construction of the NRT model of water vapour distribution in the troposphere near Poland. The first section presents all available GNSS and ground meteorological stations in the area of Poland and neighbouring countries. In this section, data feeding scheme is discussed, together with timeline and time resolution. The high consistency between measured and interpolated temperature value is shown, whereas some discrepancy in the pressure is observed. In the second section, the NRT GNSS data processing strategy of ASG-EUPOS network is discussed. Preliminary results show fine alignment of the obtained Zenith Troposphere Delays (ZTDs) with reference data from European Permanent Network (EPN) processing center. The validation of NRT troposphere products against daily solution shows 15mm standard deviation of obtained ZTD differences. The last section presents the first results of 2-D water vapour distribution above the GNSS network and application of the tomographic model to 3-D distribution of water vapour in the atmosphere. The GNSS tomography model, working on the simulated data from numerical forecast model, shows high consistency with the reference data (by means of standard deviation 4mmkm1 or 4 ppm), however, noise analysis shows high solution sensitivity to errors in observations. The discrepancy for real data preliminary solution (measured as a mean standard deviation) between reference NWP data and tomography data was on the level of 9mmkm1 (or 9 ppm) in terms of wet refractivity. Numéro de notice : A2012-749 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.5194/angeo-30-1379-2012 Date de publication en ligne : 27/09/2012 En ligne : https://doi.org/10.5194/angeo-30-1379-2012 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=33601 [article]

EuPos positoning / A. Blaser in GEO: Geoconnexion international, vol 5 n° 10 (november - december2006)

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