"Optimal sharpness function for SAR autofocus" by Timothy J. Schulz
 

Optimal sharpness function for SAR autofocus

Document Type

Article

Publication Date

1-1-2007

Abstract

Phase-error correction through the optimization of an image-domain sharpness function provides one method for the auto-focus of synthetic aperture radar (SAR) imagery. Several ad-hoc sharpness functions have been proposed, implemented, and analyzed, but none of these has been motivated as the solution to a well-defined statistical estimation problem. In this letter, a SAR sharpness function is derived that induces the solution to maximum-likelihood and maximum-posterior estimation for idealized SAR data. Furthermore, a limiting form of the optimal sharpness function is shown to be the popular intensity-squared sharpness. © 2006 IEEE.

Publication Title

IEEE Signal Processing Letters

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