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Tesis sobre el tema "Electromagnetic Inverse Scattering"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 5 de febrero de 2022

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1

Kang, Sangwoo. "Direct sampling method in inverse electromagnetic scattering problem." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS417/document.

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Le problème de l'imagerie non itérative dans le cadre de la diffraction électromagnétique inverse utilisant la méthode d'échantillonnage direct (DSM) est considéré. Grâce à une combinaison de l'expression asymptotique du champ proche ou du champ lointain diffracté et de l'hypothèse de petits obstacles, les expressions analytiques de la fonction d'indicateur DSM sont présentées dans diverses configurations telles que des configurations 2D/3D, mono-/multi-configurations statiques, à vue limitée/complète et fréquence unique/ diversité en fréquence. Une fois l'expression analytique obtenue, sa str

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2

Fouda, Ahmed Elsayed. "Electromagnetic Time-Reversal Imaging and Tracking Techniques for Inverse Scattering and Wireless Communications." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1366202740.

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3

Whittall, Kenneth Patrick. "Exploring magnetotelluric nonuniqueness using inverse scattering methods." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/27563.

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I present two algorithms which solve the one-dimensional magnetotelluric (MT) problem of finding the electrical conductivity σ(z) as a function of depth in the earth. Together, these algorithms restrict and explore the nonuniqueness of the nonlinear MT inverse problem. They accept constraints which limit the space of acceptable conductivity models and they construct diverse classes of σ(z) in order to explore this space. To avoid pitfalls during interpretation, it is essential to investigate the extent of the nonuniqueness permitted by the MT data. Algorithm 1 is a two-stage process based on

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4

Abenius, Erik. "Time-Domain Inverse Electromagnetic Scattering using FDTD and Gradient-based Minimization." Licentiate thesis, KTH, Numerical Analysis and Computer Science, NADA, 2004. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1751.

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<p>The thesis addresses time-domain inverse electromagneticscattering for determining unknown characteristics of an objectfrom observations of the scattered .eld. Applications includenon-destructive characterization of media and optimization ofmaterial properties, for example the design of radar absorbingmaterials.A nother interesting application is the parameteroptimization of subcell models to avoid detailed modeling ofcomplex geometries.</p><p>The inverse problem is formulated as an optimal controlproblem where the cost function to be minimized is thedi.erence between the estimated and obse

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5

Xiao, Jingni. "Theoretical advances on scattering theory, fractional operators and their inverse problems." HKBU Institutional Repository, 2018. https://repository.hkbu.edu.hk/etd_oa/513.

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Inverse problems arise in numerous fields of science and engineering where one tries to find out the desired information of an unknown object or the cause of an observed effect. They are of fundamental importance in many areas including radar and sonar applications, nondestructive testing, image processing, medical imaging, remote sensing, geophysics and astronomy among others. This study is concerned with three issues in scattering theory, fractional operators, as well as some of their inverse problems. The first topic is scattering problems for electromagnetic waves governed by Maxwell equat

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6

Kozlowski, Andrew James. "Computing numerical solutions to the electromagnetic two-dimensional scalar inverse scattering problem." Thesis, University of Ottawa (Canada), 1988. http://hdl.handle.net/10393/5267.

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7

Kılıç, Emre [Verfasser]. "Inverse Electromagnetic Scattering and Source Techniques Based on the Equivalence Principle / Emre Kılıç." München : Verlag Dr. Hut, 2017. http://d-nb.info/1139538160/34.

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8

Wildman, Raymond A. "Geometry optimization and computational electromagnetics methods and applications /." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 191 p, 2008. http://proquest.umi.com/pqdweb?did=1481670101&sid=23&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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9

Shih, Shih-En 1964. "Direct and inverse scattering models for electromagnetic remote sensing of time-varying sea ice and snow cover." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/17461.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1998.<br>Vita.<br>Includes bibliographical references (p. 175-184).<br>by Shih-En Shih.<br>Ph.D.

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10

Zhang, Ting. "Electromagnetic wave imaging of targets buried in a cluttered medium using an hybrid Inversion-DORT method." Phd thesis, Ecole centrale de Marseille, 2014. http://tel.archives-ouvertes.fr/tel-01037906.

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The objective of this thesis work is to detect and to characterize three-dimensional targets in a disordered medium, using electromagnetic excitations. This research domain is of great interest in many applications, such as subsoil probing, medical imaging, non-destructive testing and geophysical exploration, etc. In order to extract the target information from the heterogeneities of the medium, we propose to use one of the time reversal technique, namely the DORT method (French acronym for Décomposition de l'Opérateur de Retournement Temporel). This method permits us to generate different wav

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11

Nsengiyumva, Florence. "Contribution à la détection d’objets sur pistes d’aéroport (FOD) par tomographie millimétrique en bande W et polarimétrie." Thesis, Nice, 2016. http://www.theses.fr/2016NICE4041/document.

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Les radars millimétriques en bande W (75-110 GHz) sont en plein essor, grâce notamment aux progrès des circuits intégrés, permettant de réaliser des systèmes compacts à bas coût et haute résolution due à la courte longueur d’onde. Dans un premier temps, ces systèmes ont été utilisés à des fins de détection et de localisation, avec à terme, pour objectif l’identification. Ainsi, des systèmes d’imagerie radar ont été développés, notamment grâce à l’imagerie qualitative, basée par exemple sur l’imagerie radar par synthèse d’ouverture (SAR). Cependant, afin de reconstruire les propriétés électroma

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12

Cossonnière, Anne. "Valeurs propres de transmission et leur utilisation dans l'identification d'inclusions à partir de mesures électromagnétiques." Thesis, Toulouse, INSA, 2011. http://www.theses.fr/2011ISAT0011/document.

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La théorie des problèmes de diffraction inverses pour les ondes acoustiques et électromagnétiques est un domaine de recherche très actif qui a connu des avancées significatives ces dernières années. La Linear Sampling Method (LSM), permettant de reconstituer la forme d’un objet à partir de sa réponse acoustique ou électromagnétique avec peu de données a priori sur les propriétés physiques de l’objet, a révélé l’existence de fréquences de résonance appelées valeurs propres de transmission, pour lesquelles cette méthode échoue dans le cas d’objets diffractants pénétrables. Ces fréquences particu

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13

Miao, Jinghong. "Linear and nonlinear inverse scattering algorithms applied in 2-D electromagnetics and elastodynamics /." Kassel : Kassel Univ. Press, 2008. http://d-nb.info/989004627/04.

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14

Miao, Jinghong [Verfasser]. "Linear and Nonlinear Inverse Scattering Algorithms Applied in 2-D Electromagnetics and Elastodynamics / Miao Jinghong." Kassel : Kassel University Press, 2008. http://d-nb.info/1006916105/34.

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15

Diong, Mouhamadou. "Développement d'outils statistiques pour l'amélioration de dispositifs d'imagerie acoustique et micro-onde." Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4771/document.

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L'un des enjeux majeurs pour les systèmes d'imagerie par diffraction acoustique et micro-onde, est l'amélioration des performances obtenues au moment de la reconstruction des objets étudiés. Cette amélioration peut s'effectuer par la recherche d'algorithmes d'imagerie plus performants d'une part et par la recherche d'une meilleure configuration de mesures d'autre part. La première approche (recherche d'algorithmes) permet d'améliorer le processus d'extraction de l'information présente dans un échantillon de mesures donné. Néanmoins, la qualité des résultats d'imagerie reste limitée par la quan

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16

Hislop, Gregory Francis. "Diffraction Tomographic Imaging of Shallowly Buried Targets using Ground Penetrating Radar." Queensland University of Technology, 2005. http://eprints.qut.edu.au/16125/.

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The problem of subsurface imaging with Ground Penetrating Radar (GPR) is a challenging one. Due to the low-pass nature of soil sensors must utilise wave-lengths that are of the same order of magnitude as the object being imaged. This makes imaging difficult as straight ray approximations commonly used in higher frequency applications cannot be used. The problem becomes even more challenging when the target is shallowly buried as in this case the ground surface reflection and the near-field parameters of the radar need to be considered. This thesis has investigated the problem of imaging sh

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17

Lopez-Castellanos, Victor. "Ultrawideband Time Domain Radar for Time Reversal Applications." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1301040987.

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18

Poudel, Chetan. "Inverted Linear Halbach Array for Separation of Magnetic Nanoparticles." Oberlin College Honors Theses / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=oberlin1400251699.

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19

Watson, Francis Maurice. "Better imaging for landmine detection : an exploration of 3D full-wave inversion for ground-penetrating radar." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/better-imaging-for-landmine-detection-an-exploration-of-3d-fullwave-inversion-for-groundpenetrating-radar(720bab5f-03a7-4531-9a56-7121609b3ef0).html.

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Humanitarian clearance of minefields is most often carried out by hand, conventionally using a a metal detector and a probe. Detection is a very slow process, as every piece of detected metal must treated as if it were a landmine and carefully probed and excavated, while many of them are not. The process can be safely sped up by use of Ground-Penetrating Radar (GPR) to image the subsurface, to verify metal detection results and safely ignore any objects which could not possibly be a landmine. In this thesis, we explore the possibility of using Full Wave Inversion (FWI) to improve GPR imaging f

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20

Bellomo, Lucio. "Étude et réalisation d'un radar ULB à conjugaison de phase en micro-ondes." Phd thesis, Toulon, 2012. http://tel.archives-ouvertes.fr/tel-00703376.

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Cette thèse s'inscrit dans le domaine de l'imagerie non-destructive en électromagnétisme. L'originalité du travail réside, tout d'abord, dans sa forte connotation expérimentale. Celle-ci a abouti à la construction d'un prototype RADAR capable d'acquérir des données multisources-multistatiques dans la gamme de fréquence [2-4] GHz. De plus, ce système implémente la formation de voies au moyen d'un réseau d'atténuateurs/déphaseurs commandé numériquement.Les expériences menées relèvent, d'une part, de l'imagerie qualitative. Le Retournement Temporel, ainsi que les méthodes DORT et TR-MUSIC, ont ét

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21

Liu, Po-Tsun, and 劉柏村. "Electromagnetic Inverse Scattering for Two-Dimensional Object." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/38685477441479172756.

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碩士<br>淡江大學<br>電機工程學系<br>84<br>In this thesis, image reconstruction of a perfectly conducting cylinder bythe genetic algorithm and inverse scattering of a biaxial complex cylinder areinvestigated as follows: (i) First, we present a computational approach to reconstruct the shape of a perfectly conducting cylinder . Based on the boundary condition and the measured scattered field , we have derived a set of nonlinear integral equations and reformulated the ima

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22

丘建青. "Electromagnetic inverse scattering for two-dimensional conducting objects." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/44140846310739385831.

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23

"Some new developments on inverse scattering problems." 2009. http://library.cuhk.edu.hk/record=b5894121.

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Zhang, Hai.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2009.<br>Includes bibliographical references (leaves 106-109).<br>Abstract also in Chinese.<br>Chapter 1 --- Introduction --- p.5<br>Chapter 2 --- Preliminaries --- p.13<br>Chapter 2.1 --- Maxwell equations --- p.13<br>Chapter 2.2 --- Reflection principle --- p.15<br>Chapter 3 --- Scattering by General Polyhedral Obstacle --- p.19<br>Chapter 3.1 --- Direct problem --- p.19<br>Chapter 3.2 --- Inverse problem and statement of main results --- p.21<br>Chapter 3.3 --- Proof of the main results --- p.22<br>Chapter 3.3.1 --- P

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24

Liau, Ying-Shiang, and 廖映翔. "On Sparse Approximate Inverse Preconditioning for Solving Electromagnetic Scattering Problems." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/15795005116336911946.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>100<br>In this thesis, the electromagnetic scattering from 2-D conducting objects. The boundary of 2-D conducting objects is divided into line elements, and the governing electric field integral equation (EFIE) is discretized into a matrix equation by MoM. Then the matrix equation is iteratively solved by the preconditioned BiCG with the sparse approximate inverse (SAI) preconditioner. Preconditioners in SAI fashion can greatly reduce the preconditioner construction time and provide a decent convergence speed-up. We analyze three kinds of sparse approximate inve

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25

Zhou, Yong 1971. "High frequency electromagnetic scattering prediction and scattering feature extraction." 2005. http://hdl.handle.net/2152/9773.

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Three related electromagnetic scattering problems, namely, high frequency electromagnetic (EM) ray tracing, scattering feature extraction, and inverse scattering are studied in this dissertation. New approaches are presented to advance the state of the art in each of the areas. The presented study in electromagnetic ray tracing leads to an alternative ray tracing algorithm which can outperform the traditional algorithms for complex targets. The performance of the proposed techniques demonstrates their potential application to the study of high-frequency EM scattering prediction. Second, a gene

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26

Mojabi, Puyan. "Investigation and Development of Algorithms and Techniques for Microwave Tomography." 2010. http://hdl.handle.net/1993/3946.

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This thesis reports on research undertaken in the area of microwave tomography (MWT) where the goal is to find the dielectric profile of an object of interest using microwave measurements collected outside the object. The main focus of this research is on the development of inversion algorithms which solve the electromagnetic inverse scattering problem associated with MWT. Various regularization techniques for the Gauss-Newton inversion algorithm are studied and classified. It is shown that these regularization techniques can be viewed from within a single consistent framework after applying s

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27

Sandhu, Ali Imran. "Efficient and Accurate Numerical Techniques for Sparse Electromagnetic Imaging." Diss., 2020. http://hdl.handle.net/10754/662627.

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Electromagnetic (EM) imaging schemes are inherently non-linear and ill-posed. Albeit there exist remedies to these fundamental problems, more efficient solutions are still being sought. To this end, in this thesis, the non-linearity is tackled in- corporating a multitude of techniques (ranging from Born approximation (linear), inexact Newton (linearized) to complete nonlinear iterative Landweber schemes) that can account for weak to strong scattering problems. The ill-posedness of the EM inverse scattering problem is circumvented by formulating the above methods into a minimization problem wit

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28

Desmal, Abdulla. "Sparse Reconstruction Schemes for Nonlinear Electromagnetic Imaging." Diss., 2016. http://hdl.handle.net/10754/602275.

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Electromagnetic imaging is the problem of determining material properties from scattered fields measured away from the domain under investigation. Solving this inverse problem is a challenging task because (i) it is ill-posed due to the presence of (smoothing) integral operators used in the representation of scattered fields in terms of material properties, and scattered fields are obtained at a finite set of points through noisy measurements; and (ii) it is nonlinear simply due the fact that scattered fields are nonlinear functions of the material properties. The work described in this thesi

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29

Tsai, Chia-Chang, and 蔡佳昌. "Electromagnetic Transverse Electric Wave Inverse Scattering of a Partially Immersed Conductor by the Steady-State Genetic Algorithm." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/n5u4cb.

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碩士<br>淡江大學<br>電機工程學系碩士班<br>95<br>In this paper, we present a computational approach to the imaging of a partially immersed perfectly conducting cylinder by the steady-state genetic algorithm. A conducting cylinder of unknown shape scatters the incident transverse electric (TE) wave in free space while the scattered field is recorded outside. Based on the boundary condition and the measured scattered field, a set of nonlinear integral equations is derived and the imaging problem is reformulated into an optimization problem. An improved steady-state genetic algorithm is employed to search for th

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30

Erhard, Klaus. "Point Source Approximation Methods in Inverse Obstacle Reconstruction Problems." Doctoral thesis, 2005. http://hdl.handle.net/11858/00-1735-0000-0006-B402-4.

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31

Firoozy, Nariman. "Radar cross section data inversion for snow-covered sea ice remote sensing." 2016. http://hdl.handle.net/1993/31622.

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This thesis reports on my Ph.D. research in the area of microwave remote sensing of the Arctic. The main objective of this research is to reconstruct the dielectric profile of the snow-covered sea ice, and indirectly retrieve some of its geophysical and thermodynamic properties. To meet this objective, a nonlinear electromagnetic inverse scattering algorithm is developed that consists of forward and inverse solvers. The input to this algorithm is the normalized radar cross section (NRCS) data collected by radar systems from the snow-covered sea ice profile. The proposed inversion algorithm ite

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32

Langer, Stefan. "Preconditioned Newton methods for ill-posed problems." Doctoral thesis, 2007. http://hdl.handle.net/11858/00-1735-0000-0006-B396-D.

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