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Maitre, Henri
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- PublicationOpen AccessIMPROVEMENT OF THE TROPOSPHERIC CORRECTION BY ADAPTED PHASE FILTERING(2002)
; ; ; ; ; ; ; ; ;Chaabane, Ferdaous; Ecole Nationale Supérieure des Télécommunications ;Avallone, Antonio; Institut de Physique du Globe de Paris ;Tupin, Florence; Ecole Nationale Supérieure des Télécommunications ;Briole, Pierre; Institut de Physique du Globe de Paris ;Trouvé, Emmanuel; Ecole Nationale Supérieure des Télécommunications ;Trembley, Yvan; Institut de Physique du Globe de Paris ;Nicolas, Jean-Marie; Ecole Nationale Supérieure des Télécommunications ;Maitre, Henri; Ecole Nationale Supérieure des Télécommunications; ; ; ; ; ; ; Tropospheric inhomogeneities can form a major error source in DinSAR (Differential SAR Interferometry) measurements used in slow deformation monitoring. Previous studies introduced techniques to correct these artefacts. In [1] they propose to evaluate and correct tropospheric effects directly from raw differential interferograms by estimating the phase/altitude correlation. Since the wrapped phase noise in these interferograms influences the correction of tropospheric artefacts its removal is mandatory. In this paper, we aim to show that adapted wrapped phase filtering greatly improves the retrieval of tropospheric effects. The filtered interferograms are then used to model these artefacts. Filtered and unfiltered results are compared to quantify the improvement.200 227 - PublicationRestrictedA Multitemporal Method for Correction of Tropospheric Effects in Differential SAR Interferometry: Application to the Gulf of Corinth Earthquake(2007-06)
; ; ; ; ; ;Chaabane, F.; Mathématiques Appliquées, Signaux et Communications Department, Sup’Com, El Ghazala Ariana 2083, Tunis ;Avallone, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione CNT, Roma, Italia ;Tupin, F.; TSI Department, ENST, 75634 Paris, France ;Briole, P.; Institut de Physique du Globe, 75252 Paris, France. ;Maitre, H.; TSI Department, ENST, 75634 Paris, France; ; ; ; Tropospheric inhomogeneities can form a major error source in differential synthetic aperture radar interferometry measurements, which are used in slow-deformation monitoring. Indeed, variations of atmospheric conditions between two radar acquisitions produce variations in the signal path of two images and, thus, additional fringes on differential interferograms. These effects have a strong influence on interferograms and must be compensated to obtain reliable deformation measurements. This paper presents a methodological approach to reduce at both global and local scales tropospheric contributions directly from differential interferograms. It first requires refined knowledge of the stable scatterers that can only be obtained from the analysis of a large population of multitemporal interferograms. The correction of global-scale atmospheric contribution exploits the correlation between phase and topography. The correction of local artifacts is based on the correlation between interferograms containing one common acquisition. This technique is validated on a database of 81 differential interferograms covering the Gulf of Corinth (Greece) and used to improve the measurements of ground deformation compared to global positioning system measurements.207 24