Science Service System

Summary of Proposal MTH2473

TitleAnalysis of the phase accuracy improvement of TerraSAR-X Staring mode in comparison to the Sliding mode
Investigator Teleaga, Delia Cosmina - Advanced Studies and Research Center, Remote Sensing
Team Members
M. Sc. Poncos, Valentin - Advanced Studies and Research Center, Radar Remote Sensing Group
Dr. Serbulea, Manole-Stelian - Technical University of Civil Engineering Bucharest, Geotechnical Department
M. Sc. Patrascu, Carmen - University Politehnica of Bucharest, Faculty of Electronics, Telecommunications , Research Center for Spatial Information
SummaryTwo main objectives are defined for this proposal. The first one is to provide an analysis of point targets quality as illuminated from a larger azimuth angle variation. Thus the PSInSAR estimated deformationís accuracy can be compared for the SS and HS Spotlight beam modes. The second objective consists in promoting the local monitoring of infrastructure stability, such as toxic sludge retention dams, river banks and individual buildings. Romania had a very developed mining industry and currently around 70 conservation projects are under way. Retention dams for the liquid by-products of the mining activities were built and need monitoring. In addition to this application, river bank stability in overbuilt areas is also of major interest; local yielding of the higher ground above a river bank can trigger a generalized landslide including heavy buildings. The method proposed is using Persistent Scatterers Interferometry (PSInSAR) alternated to series of Staring and High Resolution Spotlight data with identical acquisition geometry. Separate PSInSAR processing will be applied to each TSX data stack; common targets will be identified after Staring-HS Spotlight data coregistration and deformation profiles for selected common targets will be produced and analysed. In this way, the quality of the point targets from the Staring Spotlight beam profile can be compared to the one from the HS Spotlight profile. Since the two profiles are alternated and measure the same deformation pattern, this pattern can be estimated and removed and the resulting phase noise can be easier compared between the Staring and HS Spotlight beams. The atmospheric phase will be removed with the choice of a close-by reference and the motion-related phase can be estimated from the common trend of the interlaced deformation profile of a given pixel, and removed. For this analysis, two data stacks of alternate acquisitions are required. Both the Staring and the HS Spotlight data will be acquired with identical geometry (the same beam) every 22 days. Every 11 days, the Staring and the HS Spotlight beams are alternated. The deliverables consist in two PSInSAR deformation maps and profiles derived from the HS and Staring Spotlight data, a combined PSInSAR deformation map and profiles and an analysis of the deformation accuracy for the two beam modes, together with an interpretation report provided by UTCB based on analysis of the PSI results and the in-situ measurements.

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