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 …

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 …

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 …

Synthetic aperture radar (SAR) autofocus techniques that optimize sharpness metrics can
produce excellent restorations in comparison with conventional autofocus approaches. To …

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 …

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 …

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 …

To focus a synthetic-aperture radar image which suffers from phase errors, an autofocus
algorithm, Contrast Optimization Autofocus Algorithm (COAA), is proposed. This algorithm is …

The autofocus problem in synthetic aperture radar (SAR) is considered. We precisely
characterize the multichannel nature of the SAR autofocus problem by constructing a low …

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 …