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Electromagnetic transverse electric‐wave inverse scattering of a conductor by the genetic algorithm
Author(s) -
Chiu ChienChing,
Liu PoTsun
Publication year - 1998
Publication title -
international journal of imaging systems and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.359
H-Index - 47
eISSN - 1098-1098
pISSN - 0899-9457
DOI - 10.1002/(sici)1098-1098(1998)9:5<388::aid-ima9>3.0.co;2-6
Subject(s) - conductor , transverse plane , inverse , perfect conductor , physics , algorithm , scattering , electromagnetic radiation , computer science , computational physics , quantum electrodynamics , optics , mathematics , geometry , engineering , structural engineering
The genetic algorithm is used to reconstruct the shape of a perfectly conducting cylinder illuminated by transverse electric (TE) waves. A cylinder of unknown shape scatters the incident TE wave in a free space and the scattered field is recorded outside. Based on the boundary condition and the measured scattered field, a set of nonlinear integral equations is derived and the imaging problem is reformulated into an optimization problem. The genetic algorithm is then employed to find out the global extreme solution of the cost function. Numerical results demonstrated that the genetic algorithm can tackle the inverse problem of a larger scatterer. Even when the electrical dimension of the scatterer exceeds one wavelength and the initial guess is far from the exact one, good reconstruction was obtained. In such a case, gradient‐based methods often get stuck in a local extreme. In addition, the effect of Gaussian noise on the reconstruction results is investigated. © 1998 John Wiley & Sons, Inc. Int J Imaging Syst Technol, 9, 388–394, 1998