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PIER PIER B PIER C PIER M PIER Letters
2008-09-19
Image Reconstruction of the Buried Metallic Cylinder Using FDTD Method and SSGA
By
Chung-Hsin Huang,

    Dr. Chung-Hsin Huang

    Electrical Engineering Department

    Tamkang University

    Taipei

    Homepage

Chien-Ching Chiu,

    Dr. Chien-Ching Chiu

    Department of Electrical Engineering

    Tamkang University

    Taiwan

    Homepage

Ching-Lieh Li,

    Dr. Ching-Lieh Li

    Electrical Engineering Department

    Tamkang University

    Taiwan

    Homepage

Yin-Hann Li

    Dr. Yin-Hann Li

    Electrical Engineering Department

    Tamkang University

    Taiwan

    Homepage

Progress In Electromagnetics Research, Vol. 85, 195-210, 2008
doi:10.2528/PIER08072901
Abstract
This paper presents an image reconstruction approach based on the time-domain and steady state genetic algorithm (SSGA) for a 2-D perfectly conducting cylinder buried in a half-space. The computational method combines the finite difference time domain (FDTD) method and the steady state genetic algorithms (SSGA) to determine the shape and location of the subsurface scatterer with arbitrary cross section. The subgirdding technique is implemented in the FDTD code for modeling the shape of the cylinder more closely. In order to describe an unknown 2-D cylinder with arbitrary cross section more effectively, the shape function is expanded by closed cubic-spline function instead of frequently used trigonometric series. The inverse problem is reformulatedin to an optimization problem and the global searching scheme SSGA with closedcubic-spline is then employed to search the parameter space. Numerical results show that the shadowing effect for the inverse problem in a half space results in poor image reconstruction on the backside of the cylinder. We propose the two-step strategy to overcome the shadowing effect. It is found that goodimaging quality could be attainedbasedon the proposed strategy.
Citation
Chung-Hsin Huang, Chien-Ching Chiu, Ching-Lieh Li, and Yin-Hann Li, "Image Reconstruction of the Buried Metallic Cylinder Using FDTD Method and SSGA," Progress In Electromagnetics Research, Vol. 85, 195-210, 2008.
doi:10.2528/PIER08072901
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