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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/60938

    Title: Time Domain Inverse Scattering of a Two-Dimensional Homogenous Dielectric Object with Arbitrary Shape by Particle Swarm Optimization
    Authors: Sun, C. H.;Chiu, C. C.;Li, C. L.;Huang, C. H.
    Contributors: 淡江大學電機工程學系
    Keywords: Aerospace applications;Cubic boron nitride;Cylinders (shapes);Describing functions;Dielectric devices;Dielectric materials;Finite difference method;Finite difference time domain method;Fourier series;Function evaluation;Gaussian distribution;Gaussian noise (electronic);Global optimization;Inverse problems;Numerical analysis;Numerical methods;Optimization;Particle swarm optimization (PSO);Permittivity;Repair;Restoration;Scattering;Time domain analysis;Trellis codes;Two dimensional;Arbitrary shapes;Computational approach;Cubic splines;Dielectric constants;Dielectric cylinders;Dielectric objects;Finite difference time domain (FDTD) methods;Free spaces;gaussian noise;Global searching;In order;Initial guesses;Inverse scattering problems;Inverse-scattering;numerica l results;Optimization approach (OOA);Parameter spaces;Particle swarm optimization (PSO);Scattered fields;shape functions;Subgridding technique;Time domain (OCT);Trigonometric series;Two-dimensional (2D);Shape optimization
    Date: 2008
    Issue Date: 2013-08-08 14:52:16 (UTC+8)
    Publisher: Cambridge: Electromagnetics Academy
    Abstract: This paper presents a computational approach to the two-dimensional time domain inverse scattering problem of a dielectric cylinder based on the finite difference time domain (FDTD) method and the particle swarm optimization (PSO) to determine the shape, location and permittivity of a dielectric cylinder. A pulse is incident upon a homogeneous dielectric cylinder with unknown shape and dielectric constant in free space andthe scattered fieldis recorded outside. By using the scattered field, the shape and permittivity of the dielectric cylinder are reconstructed. The subgridding technique is implemented in the FDTD code for modeling the shape of the cylinder more closely. In order to describe an unknown cylinder with arbitrary shape more effectively, the shape function is expandedb y closedcubicspline function insteadof frequently used trigonometric series. The inverse problem is resolved by an optimization approach, and the global searching scheme PSO is then employedto search the parameter space. Numerical results demonstrate that, even when the initial guess is far away from the exact one, good reconstruction can be obtained. In addition, the effects of Gaussian noise on the reconstruction results are investigated. Numerical results show that even the measured scattered E fields are contaminated with some Gaussian noise, PSO can still yield good reconstructed quality.
    Relation: Progress in Electromagnetics Research 82, pp.381-400
    DOI: 10.2528/PIER08031904
    Appears in Collections:[Graduate Institute & Department of Electrical Engineering] Journal Article

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