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Local solutions to inverse problems in geodesy: The impact of the noise covariance structure upon the accuracy of estimation / F. Bauer in Journal of geodesy, vol 81 n° 1 (January 2007)  

Public [article]  inJournal of geodesy > vol 81 n° 1 (January 2007) . - pp 39 - 51 Titre : Local solutions to inverse problems in geodesy: The impact of the noise covariance structure upon the accuracy of estimation Type de document : Article/Communication Auteurs : F. Bauer, Auteur ; P. Mathe, Auteur ; S. Pereverzev, Auteur Année de publication : 2007 Article en page(s) : pp 39 - 51 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie physique [Termes IGN] bruit (théorie du signal) [Termes IGN] covariance [Termes IGN] équation [Termes IGN] potentiel de pesanteur terrestre [Termes IGN] précision du positionnement [Termes IGN] problème inverse Résumé : (Auteur) In many geoscientific applications, one needs to recover the quantities of interest from indirect observations blurred by colored noise. Such quantities often correspond to the values of bounded linear functionals acting on the solution of some observation equation. For example, various quantities are derived from harmonic coefficients of the Earth’s gravity potential. Each such coefficient is the value of the corresponding linear functional. The goal of this paper is to discuss new means to use information about the noise covariance structure, which allows order-optimal estimation of the functionals of interest and does not involve a covariance operator directly in the estimation process. It is done on the basis of a balancing principle for the choice of the regularization parameter, which is new in geoscientific applications. A number of tests demonstrate its applicability. In particular, we could find appropriate regularization parameters by knowing a small part of the gravitational field on the Earth’s surface with high precision and reconstructing the rest globally by downward continuation from satellite data. Copyright Springer Numéro de notice : A2007-038 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-006-0049-5 En ligne : https://doi.org/10.1007/s00190-006-0049-5 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28404 [article]

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