Advanced Interferometric Modes for Accurate Retrieval of Azimuthal Displacements
Pau Prats
German Aerospace Center (DLR)
DEIB - Building 24, Alfa Room (ground floor, via Golgi 40, Milano)
June 27th, 2016
11.00 am
Contact:
Stefano Tebaldini
Research Line:
Remote sensing
German Aerospace Center (DLR)
DEIB - Building 24, Alfa Room (ground floor, via Golgi 40, Milano)
June 27th, 2016
11.00 am
Contact:
Stefano Tebaldini
Research Line:
Remote sensing
Sommario
Advanced Interferometric Modes for Accurate Retrieval of Azimuthal Displacements. Demonstration with TerraSAR-X/TanDEM-X Data
As is well known, differential SAR interferometry (DInSAR) allows the estimation of the motion in the scene in the line of sight (LOS) of the sensor with an accuracy proportional to the wavelength. In typical spaceborne SAR missions, this LOS is orthogonal to the along-track direction, implying that the estimated LOS motion has little or no information concerning the azimuthal motion within the scene, which corresponds approximately to the north-south component. Due to this limitation, the along-track motion is typically estimated using cross-correlation techniques, whose accuracy is limited by the azimuth resolution. In order to achieve a better accuracy it would be necessary to have either a SAR system with better azimuth resolution or a system with angular (squint) diversity. The seminar will present some experiments performed with TSX and TDX that exploit the angular diversity in different ways using the bi-directional and 2-look ScanSAR/TOPS modes.
As is well known, differential SAR interferometry (DInSAR) allows the estimation of the motion in the scene in the line of sight (LOS) of the sensor with an accuracy proportional to the wavelength. In typical spaceborne SAR missions, this LOS is orthogonal to the along-track direction, implying that the estimated LOS motion has little or no information concerning the azimuthal motion within the scene, which corresponds approximately to the north-south component. Due to this limitation, the along-track motion is typically estimated using cross-correlation techniques, whose accuracy is limited by the azimuth resolution. In order to achieve a better accuracy it would be necessary to have either a SAR system with better azimuth resolution or a system with angular (squint) diversity. The seminar will present some experiments performed with TSX and TDX that exploit the angular diversity in different ways using the bi-directional and 2-look ScanSAR/TOPS modes.
Biografia
Pau Prats-Iraola received the Ingeniero degree and the Ph.D. degree, both in telecommunications engineering, from the Universitat Politècnica de Catalunya (UPC), Barcelona, Spain, in 2001 and 2006, respectively. In 2001, he was a Research Assistant at the Institute of Geomatics, Spain. In 2002, he was at the Department of Signal Theory and Communications, UPC, where he worked in the field of airborne repeat-pass interferometry and airborne differential SAR interferometry. From December 2002 to August 2006, he was an Assistant Professor at the Department of Telecommunications and Systems Engineering, Universitat Autònoma de Barcelona, Barcelona, Spain. In 2006, he joined the Microwaves and Radar Institute, German Aerospace Center (DLR), Wessling, Germany, where, since 2009, he has been the Head of the Multimodal Algorithms Group. His research interests include airborne/spaceborne SAR processing and SAR interferometry.