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Indian GPS programme for earthquake studies permanent, semi-permanent and campaign-mode GPS network / M.N. Kulkarni in GIM international, vol 20 n° 1 (January 2006)

Public [article]  inGIM international > vol 20 n° 1 (January 2006) . - pp 37 - 39 Titre : Indian GPS programme for earthquake studies permanent, semi-permanent and campaign-mode GPS network Type de document : Article/Communication Auteurs : M.N. Kulkarni, Auteur Année de publication : 2006 Article en page(s) : pp 37 - 39 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications de géodésie spatiale [Termes IGN] implémentation (informatique) [Termes IGN] Inde [Termes IGN] réseau géodésique [Termes IGN] risque majeur [Termes IGN] risque naturel [Termes IGN] séisme [Termes IGN] station GPS Résumé : (Auteur) In 1998 the government of India Department of Science and Technology (DST) launched a National GPS Programme for Earthquake Hazard Assessment. The recent major earthquakes in the South East Asian region, and damage caused by the 2004 Tsunami, have demonstrated once again the importance of such a programme. This now includes a network of permanent, semi-permanent and campaign-mode GPS stations, today at an advanced stage of implementation. Numéro de notice : A2006-011 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27738 [article]

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A feasibility study of space VLBI for geodesy and geodynamics / M.N. Kulkarni (1992)

Public Titre : A feasibility study of space VLBI for geodesy and geodynamics Type de document : Monographie Auteurs : M.N. Kulkarni, Auteur Editeur : Colombus (Ohio) : Ohio State University Année de publication : 1992 Collection : Department of Geodetic Science and Surveying Reports num. 420 Importance : 214 p. Format : 21 x 27 cm Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] étude de faisabilité [Termes IGN] interférométrie à très grande base [Termes IGN] rotation de la Terre Index. décimale : 30.63 Télémétrie laser sur satellite, Télémétrie laser sur lune, VLBI Résumé : (Auteur) Space Very Long Baseline Interferometry (VLBI) is an extension of the groundbased VLBI to the space. With the launching of two or more Space VLBI satellites in the future, Space VLBI observations will be available for astrometric, geodetic and geodynamic applications. This new technique holds potential for various important applications including monitoring Earth rotation and interconnection of the reference frames used in geodesy and geodynamics. The aim of this feasibility study has been to investigate the possibility of precise estimation of geodetic parameters, with emphasis on the Earth rotation parameters (ERP's), from Space VLBI observations. A brief description of the Space VLBI technique, its possible applications, and the Space VLBI missions being planned has been given. Estimability analysis to investigate the estimability of geodetic parameters from Space VLBI observations has been carried out and a simplified mathematical model is derived in terms of estimable parameters. Results of sensitivity analysis carried out to study the sensitivity of the Space VLBI observable to the geodetic parameters of interest, including the number of these parameters and random errors in their a priori values, have been presented. Some of the dominant systematic effects including atmospheric refraction, solar radiation pressure and relativistic effects have also been investigated. Simulation studies have been carried out to study the influence of these systematic effects and a priori information on the estimation of the Earth rotation parameters. The results from the simulation studies indicate that it may be possible to use the Space VLBI technique for monitoring Earth rotation and polar motion, only if the orbital systematic effects can be modeled to a high degree of accuracy (or the satellites can be tracked, with high accuracy, independently), and precise a priori information on station coordinates from other sources is used. A brief description of the Space VLBI software developed during this study is presented, along with conclusions from this study and recommendations for further work in this area. Numéro de notice : 12098 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Monographie Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=54528

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