Title: Noise-subspace-based technique-resolution improvement for acoustical imaging of concealed rods

Authors: Mujahid Al-Azzo

Addresses: Faculty of Engineering Technology, Electrical Engineering Department, Zarqa University, P.O. Box 132222 Zarqa (13132), Zarqa, Jordan

Abstract: High-resolution methods are of major interest for estimating discrete spectra, since they overcome the resolution limit of the Fourier transform and provide very accurate estimates of the signal parameters. The problem of spatial detection and imaging of closely separated objects is investigated. This paper presents a method based on noise subspace of the correlation matrix of the noise-corrupted signal for ultrasonic holographic imaging problem. The in-line holography is employed, where the amplitude and phase of a coherent wave is recorded. The performance of the method is compared with the traditional method, Fourier transform method. The technique is investigated for different values of Signal to Noise Ratio (SNR) and synthetic aperture length.

Keywords: noise subspace; acoustic imaging; spectral estimation; holography; super-resolution method; inverse problem; concealed rods; correlation matrix; noise corrupted signals; ultrasonic holographic imaging.

DOI: 10.1504/IJSISE.2011.039181

International Journal of Signal and Imaging Systems Engineering, 2011 Vol.4 No.1, pp.21 - 26

Published online: 13 Mar 2015 *

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