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

Ponce, Octavio und Prats-Iraola, Pau und Pinheiro, Muriel und Rodriguez-Cassola, Marc und Scheiber, Rolf und Reigber, Andreas und 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), Seiten 3074-3090. IEEE. DOI: 10.1109/TGRS.2013.2269194. ISSN 0196-2892.

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Kurzfassung

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.

Dokumentart:Zeitschriftenbeitrag
Titel:Fully-Polarimetric High-Resolution 3-D Imaging with Circular SAR at L-Band
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ponce, OctavioNICHT SPEZIFIZIERT
Prats-Iraola, PauNICHT SPEZIFIZIERT
Pinheiro, MurielNICHT SPEZIFIZIERT
Rodriguez-Cassola, MarcNICHT SPEZIFIZIERT
Scheiber, RolfNICHT SPEZIFIZIERT
Reigber, AndreasNICHT SPEZIFIZIERT
Moreira, AlbertoNICHT SPEZIFIZIERT
Datum:Juni 2014
Erschienen in:IEEE Transactions on Geoscience and Remote Sensing
Referierte Publikation:Ja
In Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:52
DOI :10.1109/TGRS.2013.2269194
Seitenbereich:Seiten 3074-3090
Verlag:IEEE
ISSN:0196-2892
Status:veröffentlicht
Stichwörter: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 - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Verkehr
HGF - Programmthema:Verkehrsmanagement
DLR - Schwerpunkt:Verkehr
DLR - Forschungsgebiet:V VM - Verkehrsmanagement
DLR - Teilgebiet (Projekt, Vorhaben):V - Vabene++, R - Vorhaben Flugzeug-SAR
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Hochfrequenztechnik und Radarsysteme > SAR-Technologie
Hinterlegt von: Octavio Ponce Madrigal
Hinterlegt am:03 Aug 2012 11:34
Letzte Änderung:13 Jan 2015 11:27

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