Phase gradient autofocus-a robust tool for high resolution SAR phase correction

The phase gradient autofocus (PGA) technique for phase error correction of spotlight mode synthetic aperture radar (SAR) imagery is examined carefully in the context of four fundamental signal processing steps that constitute the algorithm. We demonstrate that excellent results over a wide variety o...

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Bibliographic Details
Published in:IEEE transactions on aerospace and electronic systems 1994-07, Vol.30 (3), p.827-835
Main Authors: Wahl, D.E., Eichel, P.H., Ghiglia, D.C., Jakowatz, C.V.
Format: Article
Language:English
Subjects:
Applied sciences
Detection, estimation, filtering, equalization, prediction
Diffraction
Electronics packaging
Error correction
Exact sciences and technology
Focusing
Image resolution
Image restoration
Information, signal and communications theory
Layout
Motion measurement
Robustness
Signal and communications theory
Signal processing algorithms
Signal, noise
Telecommunications and information theory
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Summary:The phase gradient autofocus (PGA) technique for phase error correction of spotlight mode synthetic aperture radar (SAR) imagery is examined carefully in the context of four fundamental signal processing steps that constitute the algorithm. We demonstrate that excellent results over a wide variety of scene content, and phase error function structure are obtained if and only if all of these steps are included in the processing. Finally, we show that the computational demands of the fun PGA algorithm do not represent a large fraction of the total image formation problem, when mid to large size images are involved.< >
ISSN:0018-9251
1557-9603
DOI:10.1109/7.303752