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Efficient Time-Domain Image Formation with Precise Topography Accommodation for General Bistatic SAR Configurations

Rodriguez-Cassola, Marc und Prats, Pau und Krieger, Gerhard und Moreira, Alberto (2011) Efficient Time-Domain Image Formation with Precise Topography Accommodation for General Bistatic SAR Configurations. IEEE Transactions on Aerospace and Electronic Systems. IEEE AES Society.

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Kurzfassung

Due to the lack of an appropriate symmetry in the acquisition geometry, generalised bistatic SAR cannot benefit from the two main properties of low-to-moderate resolution monostatic SAR: azimuth-invariance and topography-insensitivity. Precise accommodation of azimuth-variance and topography is a real challenge for efficent algorithms working in the Fourier-domain, but can be quite naturally handled by time-domain approaches. We present an efficient and practical implementation of a generalised bistatic SAR image formation algorithm with an accurate accommodation of these two effects. The algorithm has a common structure with the monostatic fast factorised backprojection (FFBP), and is therefore based on subaperture processing. The images computed over the different subapertures are displayed in an advantageous elliptical coordinate system capable of incorporating the topographic information of the imaged scene in an analogous manner as topography-dependent monostatic SAR algorithms do. Analytical expressions for the Nyquist requirements using this coordinate system are derived. The overall discussion includes practical implementation hints and a realistic computational burden estimation. The algorithm is tested with both simulated and actual bistatic SAR data. The actual data correspond to the spaceborne-airborne experiment between TerraSAR-X and F-SAR performed in 2007 and to the DLR-ONERA airborne experiment carried out in 2003. The presented approach proves its suitability for precise imaging of any given scene acquired by any given bistatic SAR configuration.

Dokumentart:Zeitschriftenbeitrag
Titel:Efficient Time-Domain Image Formation with Precise Topography Accommodation for General Bistatic SAR Configurations
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Rodriguez-Cassola, MarcDLR
Prats, PauDLR
Krieger, GerhardDLR
Moreira, AlbertoDLR
Datum:2011
Erschienen in:IEEE Transactions on Aerospace and Electronic Systems
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Herausgeber:
HerausgeberInstitution und/oder E-Mail-Adresse der Herausgeber
Rangaswamy, Muralidharmuralidhar.rangaswamy@hanscom.af.mil
Verlag:IEEE AES Society
Status:akzeptierter Beitrag
Stichwörter:Bistatic radar, bistatic SAR processing, backprojection, fast factorised backprojection
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EO - Erdbeobachtung
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):W - Vorhaben Entwicklung eines Mini-SAR (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Hochfrequenztechnik und Radarsysteme > Radarkonzepte
Institut für Hochfrequenztechnik und Radarsysteme > SAR-Technologie
Hinterlegt von: Marc Rodriguez Cassola
Hinterlegt am:24 Jun 2010 11:18
Letzte Änderung:04 Apr 2013 16:22

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