Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors

This study investigates the time-domain inverse scattering of ultra wide band (UWB) tomography used in reconstructing the dielectric properties of the unknown targets in two dimensions. The image reconstruction algorithm was based on the gradient minimization of an augmented cost function defined as...

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Main Author: Binajjaj, Saeed Ali Saeed
Format: Thesis
Language:English
Published: 2010
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Online Access:http://eprints.usm.my/43063/1/Saeed_Ali_Saeed_Binajjaj24.pdf
http://eprints.usm.my/43063/
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spelling my.usm.eprints.43063 http://eprints.usm.my/43063/ Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors Binajjaj, Saeed Ali Saeed TK1-9971 Electrical engineering. Electronics. Nuclear engineering This study investigates the time-domain inverse scattering of ultra wide band (UWB) tomography used in reconstructing the dielectric properties of the unknown targets in two dimensions. The image reconstruction algorithm was based on the gradient minimization of an augmented cost function defined as the difference between measured and calculated fields. Computation of the sensitivity function required two successive steps: (i) the forward (direct) propagation of the UWB wave-field, and (ii) the reverse (adjoint) propagation of the residual waves. The direct and adjoint fields were calculated using the finite-difference time-domain (FDTD) method, implementing the Mur‘s and the perfectly matched layer (PML) absorbing boundary conditions. The imaging algorithm was based on a non-linear optimization technique from which the single-step and iterative inversion schemes were realized. First, the algorithms‘ performances were evaluated using numerical simulation employing two different scanning geometries: limited and full view scanning geometries, where the applicability of these algorithms was accessed by comparing the reconstructed images with actual model. Second, the stability problem and the computational requirements were investigated using four experimental data collected by two different data acquisition systems. In experiments, organic objects with various properties were used to simulate cancerous-like dielectric profile, while the plastic pipe was employed for further performance and testing purposes. Finally, the algorithms‘ robustness against the noisy data was evaluated using two simulated experiments with signal-to-noise ratios of 6 and 8 dB respectively. 2010-06 Thesis NonPeerReviewed application/pdf en http://eprints.usm.my/43063/1/Saeed_Ali_Saeed_Binajjaj24.pdf Binajjaj, Saeed Ali Saeed (2010) Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors. PhD thesis, Universiti Sains Malaysia.
institution Universiti Sains Malaysia
building Hamzah Sendut Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Sains Malaysia
content_source USM Institutional Repository
url_provider http://eprints.usm.my/
language English
topic TK1-9971 Electrical engineering. Electronics. Nuclear engineering
spellingShingle TK1-9971 Electrical engineering. Electronics. Nuclear engineering
Binajjaj, Saeed Ali Saeed
Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors
description This study investigates the time-domain inverse scattering of ultra wide band (UWB) tomography used in reconstructing the dielectric properties of the unknown targets in two dimensions. The image reconstruction algorithm was based on the gradient minimization of an augmented cost function defined as the difference between measured and calculated fields. Computation of the sensitivity function required two successive steps: (i) the forward (direct) propagation of the UWB wave-field, and (ii) the reverse (adjoint) propagation of the residual waves. The direct and adjoint fields were calculated using the finite-difference time-domain (FDTD) method, implementing the Mur‘s and the perfectly matched layer (PML) absorbing boundary conditions. The imaging algorithm was based on a non-linear optimization technique from which the single-step and iterative inversion schemes were realized. First, the algorithms‘ performances were evaluated using numerical simulation employing two different scanning geometries: limited and full view scanning geometries, where the applicability of these algorithms was accessed by comparing the reconstructed images with actual model. Second, the stability problem and the computational requirements were investigated using four experimental data collected by two different data acquisition systems. In experiments, organic objects with various properties were used to simulate cancerous-like dielectric profile, while the plastic pipe was employed for further performance and testing purposes. Finally, the algorithms‘ robustness against the noisy data was evaluated using two simulated experiments with signal-to-noise ratios of 6 and 8 dB respectively.
format Thesis
author Binajjaj, Saeed Ali Saeed
author_facet Binajjaj, Saeed Ali Saeed
author_sort Binajjaj, Saeed Ali Saeed
title Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors
title_short Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors
title_full Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors
title_fullStr Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors
title_full_unstemmed Iterative And Single-Step Solutions Of Two Dimensional Time-Domain Inverse Scattering Problem Featuring Ultra Wide Band Sensors
title_sort iterative and single-step solutions of two dimensional time-domain inverse scattering problem featuring ultra wide band sensors
publishDate 2010
url http://eprints.usm.my/43063/1/Saeed_Ali_Saeed_Binajjaj24.pdf
http://eprints.usm.my/43063/
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score 13.160551