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Fast error analysis of continuous GNSS observations with missing data / M.S. Bos in Journal of geodesy, vol 87 n° 4 (April 2013)  

Public [article]  inJournal of geodesy > vol 87 n° 4 (April 2013) . - pp 351 - 360 Titre : Fast error analysis of continuous GNSS observations with missing data Type de document : Article/Communication Auteurs : M.S. Bos, Auteur ; R. Fernandes, Auteur ; S. Williams, Auteur ; Luisa Bastos, Auteur Année de publication : 2013 Article en page(s) : pp 351 - 360 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Géodésie spatiale [Termes IGN] bruit (théorie du signal) [Termes IGN] classification par maximum de vraisemblance [Termes IGN] données GNSS [Termes IGN] matrice de covariance [Termes IGN] série temporelle [Termes IGN] traitement de données GNSS Résumé : (Auteur) One of the most widely used method for the time-series analysis of continuous Global Navigation Satellite System (GNSS) observations is Maximum Likelihood Estimation (MLE) which in most implementations requires O(n3) operations for n observations. Previous research by the authors has shown that this amount of operations can be reduced to O(n2) for observations without missing data. In the current research we present a reformulation of the equations that preserves this low amount of operations, even in the common situation of having some missing data. Our reformulation assumes that the noise is stationary to ensure a Toeplitz covariance matrix. However, most GNSS time-series exhibit power-law noise which is weakly non-stationary. To overcome this problem, we present a Toeplitz covariance matrix that provides an approximation for power-law noise that is accurate for most GNSS time-series. Numerical results are given for a set of synthetic data and a set of International GNSS Service (IGS) stations, demonstrating a reduction in computation time of a factor of 10–100 compared to the standard MLE method, depending on the length of the time-series and the amount of missing data. Numéro de notice : A2013-218 Affiliation des auteurs : non IGN Thématique : POSITIONNEMENT Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1007/s00190-012-0605-0 Date de publication en ligne : 02/12/2012 En ligne : https://doi.org/10.1007/s00190-012-0605-0 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=32356 [article]

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