Synthetic-aperture radar processing using fast factorized back-projection

Exact synthetic aperture radar (SAR) inversion for a linear aperture may be obtained using fast transform techniques. Alternatively, back-projection integration in time domain can also be used. This technique has the benefit of handling a general aperture geometry. In the past, however, back-project...

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Bibliographic Details
Published in:IEEE transactions on aerospace and electronic systems Vol. 39; no. 3; pp. 760 - 776
Main Authors: Ulander, L.M.H., Hellsten, H., Stenstrom, G.
Format: Journal Article
Language:English
Published: New York IEEE 01.07.2003
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Algorithms
Aperture antennas
Apertures
Bandwidth
Frequency
Inversions
Layout
Materials handling
NATURAL SCIENCES
NATURVETENSKAP
Partitioning algorithms
Radar antennas
Radar imaging
Reduction
Spatial resolution
Stability
Synthetic aperture radar
Transforms
ISSN:0018-9251, 1557-9603, 1557-9603
Online Access:Get full text
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Description
Summary:Exact synthetic aperture radar (SAR) inversion for a linear aperture may be obtained using fast transform techniques. Alternatively, back-projection integration in time domain can also be used. This technique has the benefit of handling a general aperture geometry. In the past, however, back-projection has seldom been used due to heavy computational burden. We show that the back-projection integral can be recursively partitioned and an effective algorithm constructed based on aperture factorization. By representing images in local polar coordinates it is shown that the number of operations is drastically reduced and can be made to approach that of fast transform algorithms. The algorithm is applied to data from the airborne ultra-wideband CARABAS SAR and shown to give a reduction in processing time of two to three orders of magnitude.
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ISSN:0018-9251
1557-9603
1557-9603
DOI:10.1109/TAES.2003.1238734