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Fully-Polarimetric High-Resolution 3-D Imaging with Circular SAR at L-Band

Ponce, Octavio and Prats-Iraola, Pau and Pinheiro, Muriel and Rodriguez-Cassola, Marc and Scheiber, Rolf and Reigber, Andreas and Moreira, Alberto (2014) Fully-Polarimetric High-Resolution 3-D Imaging with Circular SAR at L-Band. IEEE Transactions on Geoscience and Remote Sensing, 52 (6), pp. 3074-3090. IEEE. DOI: 10.1109/TGRS.2013.2269194. ISSN 0196-2892.

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Official URL: http://ieeexplore.ieee.org


This paper presents the first fully-polarimetric high-resolution circular synthetic aperture radar (CSAR) images at L-band (1.3 GHz). The circular data were acquired in 2008 by the E-SAR airborne system of the German Aerospace Center (DLR) over the airport of Kaufbeuren, Germany. The obtained images resulting from the coherent integration of the whole circular flight are investigated and discussed in terms of two of the main CSAR properties, namely, the theoretical subwavelength resolution in the horizontal plane (x, y) and the 3-D imaging capabilities. The latter are of special interest due to the penetration of L-band in vegetated areas. These results were compared with images processed by the incoherent addition of the full synthetic aperture. The coherent approach showed a better performance, since scatterers are focused at their maximum resolution. Due to the non-linearity of the tracks and the high-computational burden, an efficient fast factorized back-projection (FFBP) has been developed. Unlike frequencydomain processors, it accommodates azimuth variances and topography changes. Limits and considerations of the proposed algorithm are described and discussed. To further accelerate this process, the FFBP was also implemented in a graphics processing unit (GPU). Processing performance has been assessed with the direct back-projection (DBP) as a reference, obtaining speedup factors up to 1800. Residual motion errors have been estimated with a new frequency-based autofocus approach for CSAR configurations based on low signal-to-clutter ratio (SNR) isotropic scatterers. High-resolution images of man-made and distributed scatterers have been analyzed and compared with stripmap SAR, both concerning anisotropic and isotropic-like scatterers. Results include a single-channel tomogram of a Luneberg lens and a fully-polarimetric tomogram of a tree.

Document Type:Article
Title:Fully-Polarimetric High-Resolution 3-D Imaging with Circular SAR at L-Band
AuthorsInstitution or Email of Authors
Prats-Iraola, PauUNSPECIFIED
Pinheiro, MurielUNSPECIFIED
Rodriguez-Cassola, MarcUNSPECIFIED
Reigber, AndreasUNSPECIFIED
Moreira, AlbertoUNSPECIFIED
Date:June 2014
Journal or Publication Title:IEEE Transactions on Geoscience and Remote Sensing
Refereed publication:Yes
In Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 3074-3090
Keywords:Autofocus, circular synthetic aperture radar (CSAR), fast factorized back-projection (FFBP), graphics processing unit (GPU), high-resolution SAR, polarimetry, synthetic aperture radar (SAR), tomography.
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - Vabene++, R - Vorhaben Flugzeug-SAR
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > SAR Technology
Deposited By: Octavio Ponce Madrigal
Deposited On:03 Aug 2012 11:34
Last Modified:13 Jan 2015 11:27

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