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New adjustment of the Croatian first order gravity network / Marija Repanic in Geodetski vestnik, vol 61 n° 4 (December 2017 - February 2018)  

Public [article]  inGeodetski vestnik > vol 61 n° 4 (December 2017 - February 2018) . - pp 630 - 648 Titre : New adjustment of the Croatian first order gravity network Type de document : Article/Communication Auteurs : Marija Repanic, Auteur Année de publication : 2017 Article en page(s) : pp 630 - 648 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] compensation [Termes IGN] constante [Termes IGN] Croatie [Termes IGN] erreur instrumentale [Termes IGN] étalonnage d'instrument [Termes IGN] réseau de premier ordre [Termes IGN] réseau gravimétrique local Résumé : (Auteur) The paper presents the new joint adjustment of the Croatian First Order Gravity Network, for the first time adjusted as a whole. The adjustment involves absolute and relative gravity measurements, latter performed in the course of four survey stages. Firstly, the measurements are concisely described. Revision of the absolute and pre-processing of the relative measurements are briefly presented. The applied adjustment model is described. Accordingly, the gravity values of all stations (absolute and relative), corrections of linear calibration coefficient and linear drift coefficients are included in the functional model as unknown parameters. The absolute measurements are included in the adjustment as observations. The new adjustment resulted in significantly different gravity values as compared to previous adjustments (of individual stages of the network). The differences in gravity values are an order of magnitude greater than the expected accuracy. It is shown that the differences are mainly due to the errors in the gravimeters’ calibration constants, which were neglected in the previous adjustments. Because of the significant differences, the new linear transformation function from the Potsdam to the Croatian Gravity System is determined. Numéro de notice : A2017-778 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.15292/geodetski-vestnik.2017.04.630-648 En ligne : http://www.geodetski-vestnik.com/61/4/gv61-4_repanic.pdf Format de la ressource électronique : URL Article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=88984 [article]

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Deformation monitoring of the submillimetric UPV calibration baseline / Luis García-Asenjo in Journal of applied geodesy, vol 11 n° 2 (June 2017)  

Public [article]  inJournal of applied geodesy > vol 11 n° 2 (June 2017) . - pp 107 - 114 Titre : Deformation monitoring of the submillimetric UPV calibration baseline Type de document : Article/Communication Auteurs : Luis García-Asenjo, Auteur ; Sergio Baselga, Auteur ; Pascual Garrigues, Auteur Année de publication : 2017 Article en page(s) : pp 107 - 114 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] base géodésique [Termes IGN] déformation géométrique [Termes IGN] distancemètre [Termes IGN] étalonnage d'instrument [Termes IGN] mécomètre [Termes IGN] stabilité [Termes IGN] Valence (Espagne) Résumé : (Auteur) A 330 m calibration baseline was established at the Universitat Politècnica de València (UPV) in 2007. Absolute scale was subsequently transferred in 2012 from the Nummela Standard Baseline in Finland and distances between pillars were determined with uncertainties ranging from 0.1 mm to 0.3 mm. In order to assess the long-term stability of the baseline, three field campaigns were carried out from 2013 to 2015 in a co-operative effort with the Universidad Complutense de Madrid (UCM), which provided the only Mekometer ME5000 distance meter available in Spain. Since the application of the ISO17123-4 full procedure did not suffice to come to a definite conclusion about possible displacements of the pillars, we opted for the traditional geodetic network approach. This approach had to be adapted to the case at hand in order to deal with problems such as the geometric weakness inherent to calibration baselines and scale uncertainty derived from both the use of different instruments and the high correlation between the meteorological correction and scale determination. Additionally, the so-called the maximum number of stable points method was also tested. In this contribution, it is described the process followed to assess the stability of the UPV submillimetric calibration baseline during the period of time from 2012 to 2015. Numéro de notice : A2017-284 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/jag-2016-0018 En ligne : https://doi.org/10.1515/jag-2016-0018 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85317 [article]

GPS, Galileo, QZSS and IRNSS differential ISBs: estimation and application / Dennis Odijk in GPS solutions, vol 21 n° 2 (April 2017)  

Public [article]  inGPS solutions > vol 21 n° 2 (April 2017) . - pp 439 – 450 Titre : GPS, Galileo, QZSS and IRNSS differential ISBs: estimation and application Type de document : Article/Communication Auteurs : Dennis Odijk, Auteur ; Nandakumaran Nadarajah, Auteur ; Safoora Zaminpardaz, Auteur ; Peter J.G. Teunissen, Auteur Année de publication : 2017 Article en page(s) : pp 439 – 450 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] base géodésique [Termes IGN] constellation GNSS [Termes IGN] données GNSS [Termes IGN] erreur systématique inter-systèmes [Termes IGN] positionnement cinématique en temps réel [Termes IGN] positionnement différentiel [Termes IGN] positionnement par GNSS [Termes IGN] résolution d'ambiguïté Résumé : (auteur) Knowledge of inter-system biases (ISBs) is essential to combine observations of multiple global and regional navigation satellite systems (GNSS/RNSS) in an optimal way. Earlier studies based on GPS, Galileo, BDS and QZSS have demonstrated that the performance of multi-GNSS real-time kinematic positioning is improved when the differential ISBs (DISBs) corresponding to signals of different constellations but transmitted at identical frequencies can be calibrated, such that only one common pivot satellite is sufficient for inter-system ambiguity resolution at that particular frequency. Recently, many new GNSS satellites have been launched. At the beginning of 2016, there were 12 Galileo IOV/FOC satellites and 12 GPS Block IIF satellites in orbit, while the Indian Regional Navigation Satellite System (IRNSS) had five satellites launched of which four are operational. More launches are scheduled for the coming years. As a continuation of the earlier studies, we analyze the magnitude and stability of the DISBs corresponding to these new satellites. For IRNSS this article presents for the first time DISBs with respect to the L5/E5a signals of GPS, Galileo and QZSS for a mixed-receiver baseline. It is furthermore demonstrated that single-frequency (L5/E5a) ambiguity resolution is tremendously improved when the multi-GNSS observations are all differenced with respect to a common pivot satellite, compared to classical differencing for which a pivot satellite is selected for each constellation. Numéro de notice : A2017-214 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1007/s10291-016-0536-y En ligne : http://dx.doi.org/10.1007/s10291-016-0536-y Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85084 [article]

Verification of the polish geodetic reference frame by means of a new solution based on permanent GNSS data from the years 2011-2014 / Tomasz Liwosz in Reports on geodesy and geoinformatics, vol 102 n° 1 (December 2016)  

Public [article]  inReports on geodesy and geoinformatics > vol 102 n° 1 (December 2016) . - pp 52 - 66 Titre : Verification of the polish geodetic reference frame by means of a new solution based on permanent GNSS data from the years 2011-2014 Type de document : Article/Communication Auteurs : Tomasz Liwosz, Auteur ; M. Ryczywolski, Auteur Année de publication : 2016 Article en page(s) : pp 52 - 66 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] Bernese [Termes IGN] coordonnées GNSS [Termes IGN] European Terrestrial Reference Frame [Termes IGN] Pologne [Termes IGN] repère de référence [Termes IGN] réseau de premier ordre [Termes IGN] station permanente Résumé : (Auteur) The new solution for the Polish geodetic primary GNSS network was created to verify the currently used reference frame (PL-ETRF2000). The new solution is based on more GNSS data (more daily observation sessions included, a longer data timespan, GLONASS observations added) which were processed in a newer reference frame (IGb08) according to up-to-date methodology and using the latest version of Bernese GNSS Software. The new long-term solution (spanning 3.7 years) was aligned to the IGb08 reference frame using a minimum constraints approach. We categorized Polish reference stations into two categories according to their data length. We obtained good agreement of the new solution with the PL-ETRF2000: for most stations position differences did not exceed 5 mm in horizontal, and 10 mm in vertical components. However, for 30 stations we observed discontinuities in position time series, mostly due to GNSS equipment changes, which occured after the introduction of PL-ETRF2000. Position changes due to the discontinuities reached 9.1 mm in horizontal components, and 26.9 mm in vertical components. The new solution takes into account position discontinuities, and in addition also includes six new stations which were installed after the introduction of the PL-ETRF2000. Therefore, we propose to update the currently-used reference frame for the Polish geodetic primary network (PL-ETRF2000) with the new solution. The new solution was also accepted by the EUREF Technical Working Group as a class A solution (highest accuracy) according to EUREF standards. Numéro de notice : A2017-302 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : 10.1515/rgg-2016-0027 En ligne : https://doi.org/10.1515/rgg-2016-0027 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=85337 [article]

Updated best practice for EDM calibrations in New South Wales / Volker Janssen in Position, n° 78 (August - September 2015)

Public [article]  inPosition > n° 78 (August - September 2015) . - pp 30 -33 Titre : Updated best practice for EDM calibrations in New South Wales Type de document : Article/Communication Auteurs : Volker Janssen, Auteur Année de publication : 2015 Article en page(s) : pp 30 -33 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie [Termes IGN] base géodésique [Termes IGN] distancemètre [Termes IGN] erreur instrumentale [Termes IGN] instrument de mesurage de distances [Termes IGN] mesurage électronique de distances [Termes IGN] Nouvelle-Galles du Sud Numéro de notice : A2015-786 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=78915 [article]

Note sur l’analyse de structure d’un réseau géodésique de base : aspect tridimensionnel / Abdelmajid Ben Hadj Salem (2015) 

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Dynamic positioning configuration and its first-order optimization / Shuqiang Xue in Journal of geodesy, vol 88 n° 2 (February 2014)  

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Le nouveau réseau géodésique national du Cameroun / J.L. Carme in XYZ, n° 131 (juin - août 2012) 

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Analyse des stochastischen Modells von GPS-Trägerphasenbeobachtungen / J. Howind (2005)

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Détermination de frontière maritime par calcul du juste milieu / F. Bourse (2005)

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Détermination du juste milieu d'objets topographiques, orientée délimitation maritime [au] service géodésie et nivellement de l'IGN / O. Minot (2003)

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Zur Höhensystemumstellung und Geoidberechnung in Bayern / C. Gerlach (2003)

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Anwendungen der satellitengestützten Radarinterferometrie zur Bestimmung von Topographie und Geschwindig-keitsfeldern / X. Wu (1998)

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Etude de détectabilité de faibles déplacements du sol par GPS en continu / Paul-Henri Morel (1996)

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A new Dutch first order gravity network and gravity datum (NEDZWA93) / Erik de Min (01/10/1995)

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