A multichannel approach to metric-based SAR autofocus

The autofocus problem in synthetic aperture radar (SAR) is considered. We precisely characterize the multichannel nature of the SAR autofocus problem by constructing a low-dimensional sub-space where the perfectly-focused image resides. To obtain a unique solution, we perform a sharpness optimizatio...

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Bibliographic Details
Main Authors: Morrison, R.L., Do, M.N.
Format: Conference Proceeding
Language:English
Subjects:
Deconvolution
Fourier transforms
Image restoration
Kernel
Layout
Mathematical model
Measurement errors
Optimization methods
Radar polarimetry
Synthetic aperture radar
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Summary:The autofocus problem in synthetic aperture radar (SAR) is considered. We precisely characterize the multichannel nature of the SAR autofocus problem by constructing a low-dimensional sub-space where the perfectly-focused image resides. To obtain a unique solution, we perform a sharpness optimization within this sub-space. The subspace characterization enables the sharpness optimization to be performed in a vector space, which is conceptually simpler, and allows the SAR autofocus problem to be cast into a similar framework with other image restoration problems where fast algorithms and efficient methods have been established. We present experimental results demonstrating that the proposed framework can be used to bring the ideas of blind multichannel deconvolution techniques to the SAR autofocus problem, allowing the dimension of the solution subspace to be reduced further.
ISSN:1522-4880
2381-8549
DOI:10.1109/ICIP.2005.1530244