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A GPS-based study to improve the accuracy of local geodetic ties at co-located sites that exploits small-scale atmospheric structure / Dhiman Mondal (2018)    

Public Titre : A GPS-based study to improve the accuracy of local geodetic ties at co-located sites that exploits small-scale atmospheric structure Type de document : Article/Communication Auteurs : Dhiman Mondal, Auteur ; Pedro Elosegui, Auteur ; James Davis, Auteur ; Zuheir Altamimi , Auteur ; Virgilio de Brito Mendes, Auteur Editeur : Washington : National Aeronautics and Space Administration NASA Année de publication : 2018 Conférence : IVS 2018, 10th general meeting of International VLBI Service for Geodesy and Astrometry 03/06/2018 09/06/2018 Longyearbyen Norvège Open Access Proceedings Importance : pp 279 - 282 Note générale : bibliographie This work is supported under NASA Space Geodesy Research Program award 16-SGR16-0002. Langues : Anglais (eng) Résumé : (auteur) The development of the next-generation of very long baseline interferometry (VLBI) systems, known as VLBI Global Observing System (VGOS), is well underway. Co-location of VGOS stations with instruments from the other space geodetic techniques (i.e., GPS, SLR, and DORIS) is essential for synergistic, robust global reference frame realization. The localties between reference points of geodetic instrumentsat co-location sites effectively connect the various techniques together. Precise ties are required for a multi-technique reference frame that is suitable for high-accuracy geophysical applications such as global sea-level change. Unfortunately, the uncertainties of local tie vectors remain above 3 mm. We are investigating approaches that could improve the accuracy of relative positions estimates of the co-location sites. These approaches use external constraints based on local atmospheric structure at core geodetic sites where multi-techniques are co-located. The challenge is to add information to the geodetic solution based on our knowledge of atmospheric structure without biasing the estimates of the intersite vectors. Here, we present preliminary results from tests wherein atmospheric structure is used to enhance the strength of geodetic solutions and combinations. In this study, we use data from existing small-scale GPS networks as a proxy for co-location sites instrumented with next-generation geodetic systems. Numéro de notice : C2018-099 Affiliation des auteurs : Géodésie+Ext (mi2018-2019) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans En ligne : https://ivscc.gsfc.nasa.gov/publications/gm2018/IVS-2018-General-Meeting-Proceed [...] Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=97035

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Understanding sea-level rise and variability, ch 9. Geodetic observations and global reference frame contributions to understanding sea-level rise and variability / Geoffrey Blewitt (2010)  

Public Titre de série : Understanding sea-level rise and variability, ch 9 Titre : Geodetic observations and global reference frame contributions to understanding sea-level rise and variability Type de document : Chapitre/Contribution Auteurs : Geoffrey Blewitt, Auteur ; Zuheir Altamimi , Auteur ; James Davis, Auteur ; et al., Auteur Editeur : New York, Londres, Hoboken (New Jersey), ... : John Wiley & Sons Année de publication : 2010 Importance : pp 256 - 284 Note générale : bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] coordonnées cartésiennes géocentriques [Termes IGN] International Terrestrial Reference Frame [Termes IGN] montée du niveau de la mer [Termes IGN] variabilité Résumé : (auteur) This chapter contains sections titled: -Introduction, -Global and Regional Reference Systems, -Linking GPS to Tide Gauges and Tide-Gauge Benchmarks, -Recommendations for Geodetic Observations. Numéro de notice : H2010-017 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Chapître / contribution nature-HAL : ChOuvrScient DOI : 10.1002/9781444323276.ch9 Date de publication en ligne : 05/07/2010 En ligne : https://doi.org/10.1002/9781444323276.ch9 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=102044