SAR Images Refocusing and Scattering Center Detection for Infrastructure Monitoring

International audienceInfrastructure monitoring applications can require the tracking of slowly moving points of a certain structure. Given a certain point from a structure to be monitored, in the context of available SAR products where the image is already focused in a slant range - azimuth grid, it is not obvious if this point is the scattering center, if it is in layover or if it is visible from the respective orbit. This paper proposes a refocusing procedure of SAR images on a set of measured points among with a 4D tomography based scattering center detection. The refocusing procedure consists of an azimuth de-focusing followed by a modified back-projection on the given set of points. The presence of a scattering center at the given positions is detected by computing the local elevation-velocity plane for each point and testing if the main response is at zero elevation. The refocusing and scattering center detection algorithm is validated on real data acquired with the TerraSAR-X satellite during March-June 2012. The mean displacement velocities of the detected scatterers show good agreement with the in-situ measurements

Surveillance d’ouvrages par technologie InSAR à EDF

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Suivi satellitaire de la déformation des ouvrages

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Développements et expérimentations sur les techniques de mesures INSAR à EDF

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La crise concordataire : catholiques français et italiens entre Pie VII et Napoléon, 1808-1814

Collection de l'Institut NapoléonInternational audienc

Multidimensional Very High Resolution SAR Interferometry for Monitoring Energetic Structures

International audienceThis paper presents a novel strategy for Stable Scatterers detection and tracking by repeat-pass SAR interferometry by coupling sub-band / sub-aperture decomposition prior to the GLRT-LQ detector. The proposed method is tested with spaceborne InSAR images provided by the TerraSAR-X satellite