Image reconstruction for 2D homogeneous dielectric cylinder using FDTD method and SSGA

Article type: Research Article

Authors: Chien, Wei^a | Huang, Chung-Hsin^b | Chiu, Chien-Ching^{b; *} | Li, Ching-Lieh^b

Affiliations: [a] Electronic Engineering Department, De Lin Institute of Technology, Tu-Cheng, Taipei, Taiwan | [b] Electrical Engineering Department, Tamkang University, Tamsui, Taiwan

Correspondence: [*] Corresponding author. E-mail: [email protected]

Abstract: This paper presents an image reconstruction approach for a 2-D homogeneous cylinder with arbitrary cross section in free space. The computational method combines the finite difference time domain (FDTD) method and non-uniform steady state genetic algorithm (NU-SSGA) to determine the shape and location of the scatterer with arbitrary shape. The subgirdding technique is implemented for modeling the shape of the cylinder more closely. The inverse problem is reformulated into an optimization problem and the global searching scheme NU-SSGA with closed cubic-spline is then employed to search the parameter space. A set of representative numerical results is presented for demonstrating that the proposed approach is able to efficiently reconstruct the electromagnetic properties of homogeneous dielectric scatterer even when the initial guess is far away from the exact one. In addition, the effects of Gaussian noises on imaging reconstruction are also investigated.

Keywords: Index terms – time domain inverse scattering, microwave imaging, FDTD, subgridding FDTD, NU-SSGA

DOI: 10.3233/JAE-2010-1070

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 2, pp. 111-123, 2010