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Airborne gravity mesasurements using a LaCoste & Romberg air-sea gravity meter / Alain Geiger (2002)

Public contenu dans Proceedings of the Workshop IMG-2002 / Olivier Francis (2003) Titre : Airborne gravity mesasurements using a LaCoste & Romberg air-sea gravity meter Type de document : Article/Communication Auteurs : Alain Geiger, Auteur ; Jérome Verdun , Auteur ; Emile E. Klingelé, Auteur ; Marc Cocard, Auteur Editeur : Luxembourg : Ministère de la culture, de l'enseignement supérieur et de la recherche Année de publication : 2002 Conférence : IMG 2002, Instrumentation and metrology in gravimetry 28/10/2002 30/10/2002 Schuttrange Grand Duché du Luxembourg Importance : pp 167 - 176 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] cohérence des données [Termes IGN] filtrage du bruit [Termes IGN] fréquence [Termes IGN] gravimètre [Termes IGN] gravimétrie spatiale Résumé : (Auteur) This paper introduces a now ap-proach to airborne gravity data reduction well-suited for survey flown at high altitude with respect to gravity sources (mountainous areas). Classical technique is reviewed and illustrated in taking advantage of airborne gravity measure-ments performed over the western French Atps by using a. LaCoste&Romberg air-sea gravity meter. The part of non-gravitational vertical ac-celerations correlated with gravity meter mea-surements are investigated with the help of co-herence spectra. Beam velocity haw proved to be strikingly correlated with vertical acceleration of the aircraft. This finding is theoretically argued by solving the equation of the gravimetric sys-tem (gravity meter and stabilized platform). The transfer function of the system is derived and a new formulation of airborne gravity data reduc-tion, which takes care of the sensitive response of spring tension to observable gravity field wave-lengths, is given. The resulting gravity signal ex-hibits a residual noise due to electronic devices and short-wavelength Eötvös effects. The use of dedicated exponential filters gives us a way to eliminate these high-frequency effects. Examples of the resulting free-air anomaly at altitude 5100 m along one particular profile are given and com-pared with free-air anomaly deduced from the classical method for processing airborne gravity data, and with upward-continued ground gravity data. Numéro de notice : C2002-019 Affiliation des auteurs : LAREG+Ext (1991-2011) Thématique : POSITIONNEMENT Nature : Communication nature-HAL : ComAvecCL&ActesPubliésIntl DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=64977