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ITRF local tie survey at Malé – Maldives / Damien Pesce (2021) 

Public Titre : ITRF local tie survey at Malé – Maldives Type de document : Rapport Auteurs : Damien Pesce, Auteur Mention d'édition : version 1 Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN Année de publication : 2021 Collection : Publications techniques en géodésie num. 600 82 8691 Importance : 69 p. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] point de liaison (géodésie) [Termes IGN] rattachement [Termes IGN] station DORIS [Termes IGN] station GNSS [Termes IGN] station permanente Résumé : (auteur) The ITRF2020 realization (most recent frame of the International Terrestrial Reference System) computed by the ITRS product Centre (IGN Geodesy research team from IPGP) are the result of the reference frames combination from four space geodesy techniques (i.e. GNSS, DORIS, SLR and VLBI). One way to achieve one common frame consists in adding to the combination results from co-located sites local tie surveys. The Maldives Meteorological Service at the Male airport is equipped with a DORIS station and a GNSS station. This report describes the local tie survey carried out in September 2021 during the DORIS station installation on site and provides the associated results. Note de contenu : 1 Introduction 2 Co-location site description 3 Local tie survey description 4 Computation and data analysis 5 Results 6 Annexes Numéro de notice : 14256 Affiliation des auteurs : IGN (2020- ) Thématique : POSITIONNEMENT Nature : Rapport nature-HAL : Rapport DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=101376

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2014 Hartebeesthoek co-location survey reprocessing report / Jean-Michaël Muller (2020) 

Public Titre : 2014 Hartebeesthoek co-location survey reprocessing report Type de document : Rapport Auteurs : Jean-Michaël Muller , Auteur ; Damien Pesce, Auteur ; Xavier Collilieux , Auteur Editeur : Saint-Mandé : Institut national de l'information géographique et forestière - IGN Année de publication : 2020 Collection : Publications techniques en géodésie num. 600828678-01 Importance : 80 p. Format : 21 x 30 cm Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] antenne ITGB [Termes IGN] axe de rotation de la Terre [Termes IGN] géoréférencement [Termes IGN] Hartebeesthoek [Termes IGN] international GPS service for geodynamics [Termes IGN] Johannesbourg [Termes IGN] matrice de covariance [Termes IGN] point de liaison (géodésie) Note de contenu : 1- Contexy 2- Georeferencing 3- HRAO determination 4- Axis determination 5- Axiscombination 6- Distance precision 7- Observations weights 8- Final results 9- References Observations Numéro de notice : 28548 Affiliation des auteurs : IGN (2020- ) Thématique : POSITIONNEMENT Nature : Rapport nature-HAL : Rapport Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97409

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Code-barres	Cote	Support	Localisation	Section	Disponibilité
28548-01	7D	Livre	SGM	K001	Exclu du prêt

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Modeling the VLBI delay for Earth satellites / Frédéric Jaron in Journal of geodesy, vol 93 n°7 (July 2019)  

Public [article]  inJournal of geodesy > vol 93 n°7 (July 2019) . - pp 953 - 961 Titre : Modeling the VLBI delay for Earth satellites Type de document : Article/Communication Auteurs : Frédéric Jaron, Auteur ; Axel Nothnagel, Auteur Année de publication : 2019 Article en page(s) : pp 953 - 961 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] E-GRASP [Termes IGN] Geodetic Reference Antenna in Space [Termes IGN] interférométrie à très grande base [Termes IGN] point de liaison (géodésie) [Termes IGN] poursuite de satellite [Termes IGN] propagation du signal [Termes IGN] retard troposphérique [Termes IGN] système international de référence céleste Résumé : (auteur) Very-long-baseline interferometry (VLBI) observations of satellites orbiting the Earth and emitting an artificial radio signal have the potential of becoming an important technique for improving the frame ties between celestial and terrestrial reference frames. Modeling the delay of the signal reception at one station with respect to the other station of a baseline is a fundamental step for correlation and parameter estimation. The near-field VLBI delay models developed so far include numerical computation, which may become expensive in terms of computation time. This applies especially when partial derivatives are to be computed, which is the normal case for least squares adjustments. Furthermore, all the models are formulated in the barycentric celestial reference system requiring large numbers. Here we present an analytical expression for the VLBI delay for the special case of satellites orbiting the Earth, observed by ground-based radio telescopes. We analytically solve the light time equation for each signal propagation path from the source to receiver one and to receiver two under the simplification of linearizing the trajectory of the satellite. By approximating the motion of the Earth as uniform during the short signal travel times we are able to work in the geocentric celestial reference system. We investigate differences between numerical and analytical solutions by simulating VLBI observations of Earth satellites. These tests reveal that delays computed with the analytical formula are consistent with those computed with the numerical solution below the detection level of VLBI but at less computational cost. Numéro de notice : A2019-354 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-018-1217-0 Date de publication en ligne : 20/11/2018 En ligne : https://doi.org/10.1007/s00190-018-1217-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=93408 [article]

InSAR Corner Cube at GRSM [diaporama] / Mourad Aimar (2019)  

Public Titre : InSAR Corner Cube at GRSM [diaporama] Type de document : Article/Communication Auteurs : Mourad Aimar, Auteur ; Clément Courde, Auteur ; Xavier Collilieux , Auteur ; Bénédicte Fruneau , Auteur ; Guillaume Schmidt, Auteur ; Isabelle Delprat, Auteur ; Damien Pesce, Auteur ; Fabien Bergerault, Auteur ; Pierre Cumerlato, Auteur ; Guy Wöppelmann , Auteur Editeur : Nice : Université Côte d'Azur Année de publication : 2019 Conférence : ILRS 2019 Technical Workshop on Laser ranging : To improve economy, performance, and adoption for new applications 21/10/2019 25/10/2019 Stuttgart Allemagne programme sans actes Importance : 16 p. Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] co-positionnement [Termes IGN] coin réflecteur [Termes IGN] déformation de la croute terrestre [Termes IGN] erreur systématique [Termes IGN] image Sentinel-SAR [Termes IGN] interféromètrie par radar à antenne synthétique [Termes IGN] point de liaison (géodésie) [Termes IGN] rattachement métrologique [Termes IGN] station permanente Résumé : (auteur) Calern's multi-technical geodetic observatory, is a co-location site for the Côte d'Azur Observatory, which host three different spatial geodesy techniques: an SLR/LLR station, a permanent DORIS station (since september 2018), and two permanent GNSS stations. Ponctually, specialists from the "Institut National de l'Information Géographique et Forestière" (IGN, France) measure the local ties between our different instruments. The objective is to determine the global biases that may exist between each of these techniques. However, local movements (deformation of soil) may take place, that's why ponctual local ties measurement are insufficient. The effective alternative we choose has been the deployment of an INSAR corner cube on our multi-technical site in the summer of 2018. Indeed, the European Space Agency (ESA) offering the SAR images of the Sentinel constellation (S-1A and S-1B), this allows us PSInSAR analyzes thus providing a systematic monitoring of the deformation of the soils of our co-location site, with great precision. After having recalled in the introduction the method of local ties measurement made by the colleagues of the IGN, this presentation will be articulated then around the design, the installation of the corner of cube, and the choice of the orbit of satellite. Numéro de notice : C2019-065 Affiliation des auteurs : ENSG+Ext (2012-2019) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComSansActesPubliés-Unpublished DOI : sans En ligne : https://hal.archives-ouvertes.fr/hal-03114069 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97005

Assessment of local GNSS baselines at co-location sites / Iván Herrera Pinzón in Journal of geodesy, vol 92 n° 9 (September 2018)  

Public [article]  inJournal of geodesy > vol 92 n° 9 (September 2018) . - pp 1079 - 1095 Titre : Assessment of local GNSS baselines at co-location sites Type de document : Article/Communication Auteurs : Iván Herrera Pinzón, Auteur ; Markus Rothacher, Auteur Année de publication : 2018 Article en page(s) : pp 1079 - 1095 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Systèmes de référence et réseaux [Termes IGN] co-positionnement [Termes IGN] erreur systématique [Termes IGN] International Terrestrial Reference Frame [Termes IGN] ligne de base [Termes IGN] point de liaison (géodésie) [Termes IGN] positionnement par GNSS [Termes IGN] retard troposphérique zénithal [Termes IGN] série temporelle [Termes IGN] station permanente Résumé : (Auteur) As one of the major contributors to the realisation of the International Terrestrial Reference System (ITRS), the Global Navigation Satellite Systems (GNSS) are prone to suffer from irregularities and discontinuities in time series. While often associated with hardware/software changes and the influence of the local environment, these discrepancies constitute a major threat for ITRS realisations. Co-located GNSS at fundamental sites, with two or more available instruments, provide the opportunity to mitigate their influence while improving the accuracy of estimated positions by examining data breaks, local biases, deformations, time-dependent variations and the comparison of GNSS baselines with existing local tie measurements. With the use of co-located GNSS data from a subset sites of the International GNSS Service network, this paper discusses a global multi-year analysis with the aim of delivering homogeneous time series of coordinates to analyse system-specific error sources in the local baselines. Results based on the comparison of different GNSS-based solutions with the local survey ties show discrepancies of up to 10 mm despite GNSS coordinate repeatabilities at the sub-mm level. The discrepancies are especially large for the solutions using the ionosphere-free linear combination and estimating tropospheric zenith delays, thus corresponding to the processing strategy used for global solutions. Snow on the antennas causes further problems and seasonal variations of the station coordinates. These demonstrate the need for a permanent high-quality monitoring of the effects present in the short GNSS baselines at fundamental sites. Numéro de notice : A2018-459 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-017-1108-9 Date de publication en ligne : 17/01/2018 En ligne : https://doi.org/10.1007/s00190-017-1108-9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=91056 [article]

Consistent realization of celestial and terrestrial reference frames / Younghee Kwak in Journal of geodesy, vol 92 n° 9 (September 2018)  

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Assessment of the possible contribution of space ties on-board GNSS satellites to the terrestrial reference frame / Sara Bruni in Journal of geodesy, vol 92 n° 4 (April 2018)  

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ITRF local tie survey at Mangilao, Guam (Mariana Island, USA) / Damien Pesce (2018) 

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A global terrestrial reference frame from simulated VLBI and SLR data in view of GGOS / Susanne Glaser in Journal of geodesy, vol 91 n° 7 (July 2017)  

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VLBI observations of GNSS-satellites : from scheduling to analysis / Lucia Plank in Journal of geodesy, vol 91 n° 7 (July 2017)  

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Uncertainty assessment in geodetic network adjustment by combining GUM and Monte-Carlo-simulations / Wolfgang Niemeier in Journal of applied geodesy, vol 11 n° 2 (June 2017)  

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Analysis and results of ITRF2014 / Zuheir Altamimi (2017)  

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IGN best practice for surveying instrument reference points at ITRF co-location sites / Jean-Claude Poyard (2017)  

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ITRF local tie survey at Saint-John’s, Canada / Thomas Donal (2017) 

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Local tie survey at McDonald / Mathilde Kremp (2017)

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