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RELAX-Based Autofocus Algorithm for High-Resolution Strip-Map SAR

Ghaemi, Hirad and Börner, Thomas and Viberg, Mats and Galetti, Michele and Gekat, Frank (2009) RELAX-Based Autofocus Algorithm for High-Resolution Strip-Map SAR. In: Proceedings of IEEE Radar Conference (RadarCon), pp. 1-6. IEEE Radar Conference (RadarCon), 2009-05-04 - 2009-05-08, Pasadena, CA, USA.

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This paper addresses the non-iterative quality phase gradient autofocus (QPGA) technique which was originally proposed to remove one-dimensional phase errors in spotlightmode synthetic aperture radar (SAR) imagery. By enriching the source pool, the method is modified in a way suitable for autofocus in stripmap-mode SAR system with the advantage of being independent of any priori assumptions. Unlike the QPGA the potential candidates, i.e., dominant scatterers located along azimuth in each specific range bin, are automatically selected by exploiting the one-dimensional RELAX algorithm. Furthermore, RELAX is capable of estimating the size of blur window which is, in fact, associated with the Doppler spread of signal spectrum. The corresponding model includes four parameters i.e., complex amplitude, delay, Doppler center and spectral width. The proposed method has been applied to data extracted by a ground-based rotating coherent Doppler radar operating in strip-mapping mode SAR, with the aim of highresolution clutter detection.

Document Type:Conference or Workshop Item (Speech, Paper)
Additional Information:©2009 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Title:RELAX-Based Autofocus Algorithm for High-Resolution Strip-Map SAR
AuthorsInstitution or Email of Authors
Ghaemi, Hiradghaemi_hirad@hotmail.com
Galetti, MicheleUNSPECIFIED
Date:May 2009
Journal or Publication Title:Proceedings of IEEE Radar Conference (RadarCon)
Refereed publication:No
In ISI Web of Science:No
Page Range:pp. 1-6
Keywords:SAR, signal processing, RELAX, QPGA, rotating SAR
Event Title:IEEE Radar Conference (RadarCon)
Event Location:Pasadena, CA, USA
Event Type:Conference
Event Dates:2009-05-04 - 2009-05-08
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben SAR-Expert-Support-Lab (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Deposited By: Dr.rer.nat. Thomas Börner
Deposited On:15 Jul 2009 15:47
Last Modified:12 Dec 2013 20:38

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