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Summary of Proposal MTH1628

TitleImprovement of 4D SAR measurements using TerraSAR-X data
Investigator Patrascu, Carmen - University Politehnica of Bucharest, Appl. Electronics and Information Engineer.
Team Member
Dr. Teleaga, Delia - Advanced Studies and Research Center, Radar Remote Sensing Group
Prof. Dr. Datcu, Mihai - German Aerospace Center, DLR Remote Sensing Technology Institute
SummarySAR Interferometry uses coherent waves’ properties for the computation of digital elevation models, but suffers from limitations introduced by the temporal and spatial decorrelation of the surface that lead to the necessity of new methods for earth deformation over large time intervals. In this context we propose to implement a 4D coherent processor for SAR data that consists of two parts: a module for persistent scatterer analysis and an extension to tomography. The processor aims not only at measuring the variation, direction and velocity of the displacements, but also to increase the precision regarding 3D reconstruction. The designed algorithms aim at advanced parameter estimation in order to lower the influence of artifacts. For this reason, we need to establish a theoretic framework in order to evaluate the applicability of tomographic algorithms in multiple scattering cases. Moreover, tomography techniques will also be employed for detection of multiple targets inside the resolution cell. The results will be compared to those obtained by using the more classical methods of PSI.Furthermore, the problem of phase quality will be addressed. The implemented processor will be used to model phase induced errors and compute a quality of the measured phase based on existing interferometric products. Main deliverables include a prototype for the 4D SAR processor and service architecture documents. The selected test sites are the city of Bucharest, Romania and the Piatra Craiului Mountains, in the Southern Carpathians mountain chain. A number of at least 20 scenes will be requested for each test site, acquired using right looking descending passes, with an incidence angle > 35 (incidence angles preferred in the interval 36-39). For the Bucharest test site, the coordinates of the test area are 44.44 N 26.10 E, with the upper left corner of the image at 44.75 N 25.94 E, and the lower right corner at 44.17 N 26.20 E. The Piatra Craiului test site is defined by the following coordinates: 45.47 N 25.25 E (scene center coordinates). These coordinates should remain constant throughout the entire acquisition period. Monostatic interferometric data is needed with similar polarization in the entire data set. The funding of the proposal will be entirely supported by University Politehnica of Bucharest in the frame of the research project TomoSAR (Enhancing Four Dimensional Synthetic Aperture Radar Measurements), code PN-II-ID-PCE-2011-3-1027, funded by the Romanian Authority for Scientific Research (ANCS) through the National Plan for Research and Development PN-II 2007-2013.

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