To focus synthetic aperture radar data suffering from phase errors, a novel autofocus
algorithm is presented. The algorithm uses the coordinate descent technique to estimate the …

Abstract The Back Projection (BP) algorithm is a very important time-domain methodology
for Synthetic Aperture Radar (SAR) imaging. However, conventional autofocus techniques …

An autofocus method was presented based on an entropy criterion for synthetic aperture
radar imaging. An iterative method, through minimizing the entropy, was derived to obtain …

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 …

This paper proposes an autofocus method based on minimum-entropy criterion for synthetic
aperture radar imaging. Through minimizing the entropy, an iterative method is derived to …

The autofocus problem in synthetic aperture radar (SAR) is considered, where phase errors
in the acquired signal data result in imagery that is improperly focused. We present a new …

A novel autofocus method for synthetic aperture radar (SAR) image is studied. Based on a
quadratic model for the phase error within each sub-area (narrow strip× sub-aperture) after a …

The authors address the problem of focusing synthetic aperture radar (SAR) images for wide
azimuth angle of observation. In these applications a second order polynomial …

For real-time autofocus of defocused images produced by Synthetic Aperture Radar (SAR),
the twodimensional autofocus approach proposed in this study is used to correct the …

We present a new noniterative approach to synthetic aperture radar (SAR) autofocus,
termed the multichannel autofocus (MCA) algorithm. The key in the approach is to exploit the …