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Finite Element And High Frequency Modeling Of Electromagnetic Scattering From Randomly Rough Surface And Target

Posted on:2013-03-28Degree:MasterType:Thesis
Country:ChinaCandidate:J LiFull Text:PDF
GTID:2248330395456542Subject:Radio Physics
Abstract/Summary:PDF Full Text Request
Study of electromagnetic (EM) scattering from rough surface is of greatimportance in both theoretical analysis and practical applications and it has beenextensively researched. The thesis focuses on simulation techniques that models EMscattering from single randomly rough surface, as well as combinative target composedof rough surface and target. In the thesis, both finite element method (FEM) and highfrequency methods are studied and employed. EM scattering from one dimensional(1-D) rough surface,1-D rough (sea) surface with2-D target above and2-D roughsurface with3-D target above is investigated and discussed. The contents of the workcan be included as1. Application of FEM in modeling deterministic problems is introduced, and2-Dand3-D EM boundary value problems are transformed to equivalent problems ofvariation of functional.2. Based on the scheme of automatic construction and meshing of FEM domainwith rough boundaries, hybrid finite element-boundary integral method (FE-BI) isapplied to investigate EM scattering from1-D rough surface. Influences of roughness ofrandom rough surface on scattering characteristics are discussed, and the EM fielddistribution is simulated with the presence of target above.3. A multi-hybrid method combining finite element, boundary integral andKirchhoff approximation is presented, which is applied to model EM scattering frominhomogeneous and plasma-coated target above rough (sea) surface.4. A combinative geometric model combing2-D rough surface and3-D target isgiven, based on which physical optics (PO) method and shooting and bouncing rays(SBR) method are employed to examine the properties of EM scattering in frequencydomain for3-D target above randomly2-D rough surface. In addition, time-domainiterative physical optics (TDIPO) is adopted to consider the multi-scattering effectswhen exploring transient and wide band scattering characteristics for the compositescattering of target and rough surface.
Keywords/Search Tags:randomly rough surface, composite electromagnetic scattering, finite element method, high frequency method, hybrid method
PDF Full Text Request
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