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Summary of Proposal LAN2496

TitleDetectability of low cost reflecting targets array forspaceborne monitoring of natural slopes and embankments in TerraSAR-X data
Investigator Toma, Stefan-Adrian - Advanced Studies and Research Center, Radar Remote Sensing Group
Team Members
Dr. Manoli, Daniel-Marcel - Technical University of Civil Engineering Bucharest, Geotechnical Department
M. Sc. Poncos, Valentin - TERRASIGNA,
SummaryThis proposal aims at the acquisition of TerraSAR-X Staring and Stripmap data to be employed in the implementation of the research project REFLECT (Low Cost REFLECTing Targets Array for Spaceborne Monitoring of Natural Slopes and Embankments), funded by the Romanian Authority for Scientific Research through the STAR 2013 – ROSA programme, between 2014-2016. The funding of the research involved within the current proposal will be entirely supported through the REFLECT project. Monitoring the displacement of soil masses through radar interferometric techniques may be difficult in areas where there are not enough coherent scattering targets to be considered in the analysis. To enhance the quality of the obtained interferograms, metal corner reflectors are used. The currently used corner reflectors have limitations in terms of shape,material and installation in various civil engineering structures. In order to overcome those inconveniences, the objective of the proposed research is to analyse multiple types of passive reflectors created from different materials (printed concrete, metal coating,or steel insertions, etc.), with different geometric shapes and for different types of measurements, so that a good cost over performance ratio is obtained. Reflectors testing will take into account the technical specifications of the future European satellite Sentinel and German satellite TerraSAR‐X 2, so that the results be used for these satellites as well. The projects’ output will hopefully representan improvement regarding the use of reflectors for displacement monitoring,enabling the InSAR monitoring technique in wider areas of civil engineering. The foreseen methods in the REFLECT project include experimental numerical modelling, ground test site imaging of the reflecting targets using ground based antennas, and a real case study, analysed and monitored using optimized reflectors in conjunction with TerraSAR-X acquisitions, doubled by deformations monitoring using classical instruments. This approach requires, for the validation phase, two data stacks of alternate acquisitions of TerraSAR-X Staring Spotlight and of TerraSAR-X Stripmap, SLC format. Both the Staring and the Stripmap data will be acquired with identical geometry (the same beam) every 22 days.Every 11 days, the Staring and the Stripmap beams are alternated. Separate PSInSAR processing will be applied to each TSX data stack. Also a comparison of the corner reflectors detectability in the 2 beam modes is planned. SNR is greater in Staring mode,also the resolution is higher, thus better detectability with Staring mode is expected. But, since the covered area by a Stripmap acquisition is significantly larger than by a Staring scene, it is important to compare the Stripmap capabilities in targets detection with the best expected target detection of Staring mode. The deliverables of the project will consist in two PSInSAR deformation maps and profiles derived from the Staring Spotlight and Stripmap data, analysis of target reflectors detection in the 2 modes (provided by ASRC), together with an optimal parameters report for reflectors manufacturing (provided by UTCB).

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