Electromagnetic scattering~of metallic cylinders of arbitrary
shape by using asynchronous particle swarm optimization and non-uniform steady
state genetic algorithm
Affiliations: [a] Electrical Engineering Department, Tamkang University,
New Taipei City, Taiwan | [b] Department of Electronic and Computer Engineering, National Taiwan University of
Science and Technology, Taipei City, Taiwan
Correspondence:
[*]
Corresponding author: Chien-Ching Chiu, Electrical Engineering
Department, Tamkang University, New Taipei City, Taiwan. E-mail:
[email protected]
Abstract: Two techniques for the shape reconstruction of multiple metallic
cylinders from scattered fields are investigated in this paper, in which
two-dimensional configurations are involved. After an integral formulation, the
method of moment (MoM) is applied to solve it numerically. Two separate
perfect-conducting cylinders of unknown shapes are buried in one half-space and
illuminated by the transverse magnetic (TM) plane wave from the other half
space. Based on the boundary condition and the measured scattered field, a set
of nonlinear integral equation is derived and the imaging problem is
reformulated into optimization problem. The non-uniform steady state genetic
algorithm (NU-SSGA) and asynchronous particle swarm optimization (APSO) are
employed to find out the global extreme solution of the object function.
Numerical results demonstrate even when the initial guesses are far away from
the exact shapes, and the multiple scattered fields between two conductors are
serious, good reconstruction can be obtained. In addition, the effect of
Gaussian noise on the reconstruction results is investigated and the numerical
simulation shows that the reconstruction results are good and acceptable, as
long as the SNR is greater than 20 dB.
