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

Rodriguez-Cassola, Marc and Prats, Pau and Krieger, Gerhard and 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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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.

Document Type:Article
Title:Efficient Time-Domain Image Formation with Precise Topography Accommodation for General Bistatic SAR Configurations
AuthorsInstitution or Email of Authors
Rodriguez-Cassola, MarcDLR
Prats, PauDLR
Krieger, GerhardDLR
Moreira, AlbertoDLR
Journal or Publication Title:IEEE Transactions on Aerospace and Electronic Systems
Refereed publication:Yes
In ISI Web of Science:Yes
Rangaswamy, Muralidharmuralidhar.rangaswamy@hanscom.af.mil
Publisher:IEEE AES Society
Keywords:Bistatic radar, bistatic SAR processing, backprojection, fast factorised backprojection
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 Entwicklung eines Mini-SAR (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Microwaves and Radar Institute > Radar Concepts
Microwaves and Radar Institute > SAR Technology
Deposited By: Marc Rodriguez Cassola
Deposited On:24 Jun 2010 11:18
Last Modified:04 Apr 2013 16:22

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