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Summary of Proposal MTH3178

TitleInterferometric processing for different acquisition modes
Investigator Lopez-Sanchez, Juan M - University of Alicante, DFISTS, EPS
Team MemberNo team members defined
SummaryOBJECTIVES From the operational point of view, the mainobjective of this project is the adaption of the interferometricsoftware developed at the University of Alicante to differentacquisition modes (i.e. spotlight and scanSAR) in order to increase theusability of the TerraSAR-X images by scientific end-users from thefields of civil engineering and geophysics. The current version of thesoftware works only with images acquired in stripmap mode, so theextension to spotlight and scanSAR will be beneficial to enlarge thepossibilities of analysis of areas by differential SAR interferometrywith different datasets. METHOD Based on theavailable literature (see references at the end of the executivesummary) we will modify the required steps of the processing chain forthe two new modes: spotlight and scanSAR. The steps to be modified are, at least, coregistration and azimuth filtering, in order to take intoaccount the specific spectral features of the images acquired underthese modes. The first part of the project will be dedicatedto spotlight, since it is conceptually easier to be modified fromstripmap processing. The main characteristic of this sort of SAR data is the presence of a linear trend in the Doppler centroid from the firstline to the last line ofthe image, as a consequence of the antennasteering. This trend makes the position of the azimuth spectrum todepend on the azimuth time. For interferometric purposes, differences in the Doppler centroid positions between the master and the slave imagehave to be accounted for either by properly shifting the interpolationkernels or by shifting the image spectra to base band. Inthe second part of the project, the adaption of the interferometricprocessing software to scanSAR will be carried out. In this case, theacquisition in bursts makes more complex the frequency content of theimages, hence requiring more steps for the proper interfermetricprocessing. DATAR EQUIREMENTS The implementedchanges will be tested with different pairs of images (a tleast three)acquired over different geographical areas and under differentconditions (incidence angles), to properly assess the performance of the new algorithm. Consequently, this project requires, atleast, 6 pairs of images, of which 3 were acquired in spotlight mode and the other 3 in scanSAR mode. DELIVERABLES The output of this project will be the code (and its associated documentation) with the implemented changes. Areport with the performance of the results will be provided too. FUNDING Theactibities associated with this research will be funded by the Spanish Ministry of Economy and Competitiveness (MINECO) underproject TIN2014-55413-C2-2-P. BIBLIOGRAPHY M.Eineder et al, "Spaceborne Spotlight SAR Interferometry WithTerraSAR-X", IEEETransactions on Geoscience and Remote Sensing, Vol. 47, No. 5, May 2009. J. Holzner & R. Bamler, "Burst-Mode and ScanSAR Interferometry", IEEETransactions on Geoscience and Remote Sensing, Vol. 40, No. 9, Sept.2002. N. Yague et al., "TerraSAR-X TOPS, ScanSAR and WideScanSARinterferometric processing", Proceedings of EUSAR2014, pp. 945-948, Jun. 2014.

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