A comparison of imaging methods using GPR for landmine detection and a preliminary investigation into the SEM for identification of buried objects

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dc.contributor.supervisor LoVetri, Joe (Electrical and Computer Engineering) en
dc.contributor.author Gilmore, Colin G.
dc.date.accessioned 2005-01-13T16:26:15Z
dc.date.available 2005-01-13T16:26:15Z
dc.date.issued 2005-01-13T16:26:15Z
dc.identifier.uri http://hdl.handle.net/1993/98
dc.description.abstract Part I: Various image reconstruction algorithms used for subsurface targets are reviewed. It is shown how some approximate wavefield inversion techniques: Stripmap Synthetic Aperture Radar (SAR), Kirchhoff Migration (KM) and Frequency-Wavenumber (FK) migration are developed from various models for wavefield scattering. The similarities of these techniques are delineated both from a theoretical and practical perspective and it is shown that Stripmap SAR is, computationally, almost identical to FK migration. A plane wave interpretation of both Stripmap SAR and FK migration is used to show why they are so similar. The electromagnetic assumptions made in the image reconstruction algorithms are highlighted. In addition, it is shown that, theoretically, FK and KM are identical. Image reconstruction results for KM, Stripmap SAR and FK are shown for both synthetic and experimental Ground Penetrating Radar (GPR) data. Subjectively the reconstructed images show little difference, but computationally, Stripmap SAR (and therefore, FK migration) are much more efficient. Part II: A preliminary investigation into the use of the Singularity Expansion Method (SEM) for use in identifying landmines is completed using a Finite-Difference Time-Domain code to simulate a simplified GPR system. The Total Least Squares Matrix Pencil Method (TLS-MPM) is used to determine the complex poles from an arbitrary late-time signal. Both dielectric and metallic targets buried in lossless and lossy half-spaces are considered. Complex poles (resonances) of targets change significantly when the objects are buried in an external medium, and perturbation formulae for Perfect Electric Conductor (PEC) and dielectric targets are highlighted and used. These perturbation formulae are developed for homogenous surrounding media, and their utilization for the half-space (layered medium) GPR problem causes inaccuracies in their predictions. The results show that the decay rate (real part) of the complex poles is not suitable for identification in this problem, but that with further research, the resonant frequency (imaginary part) of the complex poles shows promise as an identification feature. en
dc.format.extent 1464529 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject GPR en
dc.subject Target Identification en
dc.subject Seismic Migration en
dc.subject Stripmap SAR en
dc.subject Landmines en
dc.subject SEM en
dc.subject CNR en
dc.title A comparison of imaging methods using GPR for landmine detection and a preliminary investigation into the SEM for identification of buried objects en
dc.type info:eu-repo/semantics/masterThesis
dc.type master thesis en_US
dc.degree.discipline Electrical and Computer Engineering en
dc.contributor.examiningcommittee Bridges, Greg (Electrical and Computer Engineering) Naterer, Greg (Mechanical and Manufacturing Engineering) en
dc.degree.level Master of Science (M.Sc.) en
dc.description.note February 2005 en

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