Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Synthetic-aperture radar autofocus by maximizing sharpness

Not Accessible

Your library or personal account may give you access

Abstract

To focus a synthetic-aperture radar image that is suffering from phase errors, a phase-error estimate is found that, when it is applied, maximizes the sharpness of the image. Closed-form expressions are derived for the gradients of a sharpness metric with respect to phase-error parameters, including both a point-by-point (nonparametric) phase function and coefficients of a polynomial expansion. Use of these expressions allows for a highly efficient gradient-search algorithm for high-order phase errors. The effectiveness of the algorithm is demonstrated with an example.

© 2000 Optical Society of America

Full Article  |  PDF Article
More Like This
Aberration correction by maximizing generalized sharpness metrics

J. R. Fienup and J. J. Miller
J. Opt. Soc. Am. A 20(4) 609-620 (2003)

Noise and speckle reduction in synthetic aperture radar imagery by nonparametric Wiener filtering

Robert S. Caprari, Alvin S. Goh, and Emily K. Moffatt
Appl. Opt. 39(35) 6633-6640 (2000)

Synthetic aperture radar image correlation by use of preprocessing for enhancement of scattering centers

J. Khoury, Peter D. Gianino, and Charles L. Woods
Opt. Lett. 25(20) 1544-1546 (2000)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (2)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (13)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics

Select as filters


Select Topics Cancel
© Copyright 2022 | Optica Publishing Group. All Rights Reserved