An Autofocus Method for Backprojection Imagery in Synthetic Aperture Radar

In this letter, we present an autofocus routine for backprojection imagery from spotlight-mode synthetic aperture radar data. The approach is based on maximizing image sharpness and supports the flexible collection and imaging geometries of BP, including wide-angle apertures and the ability to image...

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Bibliographic Details
Published in:IEEE geoscience and remote sensing letters 2012-01, Vol.9 (1), p.104-108
Main Author: Ash, J. N.
Format: Article
Language:English
Subjects:
Apertures
Autofocus
autoregressive backprojection (ARBP)
Azimuth
convolution BP (CBP) imaging
Effectiveness
Exact solutions
Focusing
History
Imagery
Imaging
Measurement
Optimization
Synthetic aperture radar
synthetic aperture radar (SAR)
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Summary:In this letter, we present an autofocus routine for backprojection imagery from spotlight-mode synthetic aperture radar data. The approach is based on maximizing image sharpness and supports the flexible collection and imaging geometries of BP, including wide-angle apertures and the ability to image directly onto a digital elevation map. While image-quality-based autofocus approaches can be computationally intensive, in the backprojection setting, we demonstrate a natural geometric interpretation that allows for optimal single-pulse phase corrections to be derived in closed form as the solution of a quartic polynomial. The approach is applicable to focusing standard backprojection imagery, as well as providing incremental focusing in sequential imaging applications based on autoregressive backprojection. An example demonstrates the efficacy of the approach applied to real data for a wide-aperture backprojection image.
ISSN:1545-598X
1558-0571
DOI:10.1109/LGRS.2011.2161456