Synthetic aperture radar (SAR) imaging suffers from image focus degradation in the
presence of phase errors in the received signal due to unknown platform motion or signal …

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 …

Multichannel autofocus (MCA) for synthetic aperture radar (SAR) assumes one-dimensional
defocusing and that the perfectly focused image has low return at the image edge, where 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 …

Two methods of focusing synthetic aperture radar (SAR) images are compared. Both a
conventional subaperture cross-correlation method and a new phase gradient autofocus …

Autofocus algorithms are used to restore images in nonideal synthetic aperture radar
imaging systems. In this paper, we propose a bilinear parametric model for the unknown …

An autofocus operation is an indispensable procedure to obtain well-focused images for
synthetic-aperture radar (SAR) systems without precise navigation devices. Three …

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 …

With continuous improvement of the synthetic aperture radar (SAR) resolution, the 2-D
defocus effect in SAR image resulting from uncompensated motion error has made …

This paper discusses a multistage approach to entropy minimization for SAR image
autofocus. The new algorithm is compared to existing approaches, including point based …