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A sparsity-driven approach for SAR image formation and space-variant focusing (SAR görüntü oluşturma ve uzam değişir odaklama için seyreklik güdümlü bir yaklaşım)

Önhon, Özben Naime and Çetin, Müjdat (2011) A sparsity-driven approach for SAR image formation and space-variant focusing (SAR görüntü oluşturma ve uzam değişir odaklama için seyreklik güdümlü bir yaklaşım). In: IEEE 19th Conference on Signal Processing and Communications Applications (SIU 2011), Antalya, Turkey

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Official URL: http://dx.doi.org/10.1109/SIU.2011.5929725

Abstract

In synthetic aperture radar (SAR) imaging, the uncertainties on the position of the sensing platform and on the motion of objects in the observed scene, are important problem sources. These types of uncertainties cause phase errors in the SAR data and subsequently defocusing in the formed image. The defocusing caused by the inexact knowledge of the position of the sensing platform is space-invariant, i.e., the amount of defocusing is same for all points in the scene. However, moving targets in the scene cause space-variant defocusing, i.e., the defocusing arises only in the parts of the image including the moving targets, whereas the stationary background is not defocused. To obtain a focused image, phase errors caused by the moving objects need to be removed. In scenarios involving of multiple point targets moving with different velocities in the scene, considering that the scene to be imaged is usually sparse, we present a sparsity-driven method for joint SAR imaging and removing the defocus caused by moving targets. The proposed method is based on the optimization of a cost function of both the image and phase errors, in a nonquadratic regularization based framework.

Item Type:Papers in Conference Proceedings
Subjects:T Technology > TK Electrical engineering. Electronics Nuclear engineering
ID Code:18312
Deposited By:Müjdat Çetin
Deposited On:06 Jan 2012 12:06
Last Modified:06 Jan 2012 12:06

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