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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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.
|Title:||Fully-Polarimetric High-Resolution 3-D Imaging with Circular SAR at L-Band|
|Journal or Publication Title:||IEEE Transactions on Geoscience and Remote Sensing|
|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:||Space|
|HGF - Program Themes:||Earth Observation|
|DLR - Research area:||Raumfahrt|
|DLR - Program:||R EO - Erdbeobachtung|
|DLR - Research theme (Project):||R - Vorhaben Flugzeug-SAR (old)|
|Institutes and Institutions:||Microwaves and Radar Institute > SAR Technology|
|Deposited By:||Octavio Ponce Madrigal|
|Deposited On:||03 Aug 2012 11:34|
|Last Modified:||30 May 2014 14:03|
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