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Image Reconstruction of a Buried Perfectly Conducting Cylinder Illuminated by Transverse Electric Waves

机译:横向电波照亮的埋入式导电圆柱的图像重建

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This article presents a computational approach to the image reconstruction of a perfectly conducting cylinder illuminated by transverse electric waves. A perfectly conducting cylinder of unknown shape buried in one half-space and scatters the incident wave from another half-space where the scattered field is recorded. 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 steady state genetic algorithm is then employed to find out the global extreme solution of the cost function. Numerical results demonstrated that, even when the initial guess is far away from the exact one, good reconstruction can be obtained. In such a case, the gradient-based methods often get trapped in a local extreme. In addition, the effect of different noise on the reconstruction is investigated.
机译:本文提出了一种计算方法,用于通过横向电波照射的完美导电圆柱体的图像重建。一个未知形状的完美传导圆柱体埋在一个半空间中,并将入射波从另一半空间散射,记录散射场。根据边界条件和测得的散射场,导出一组非线性积分方程,并将成像问题重新表述为优化问题。然后,采用稳态遗传算法找出成本函数的全局极限解。数值结果表明,即使初始猜测值与实际值相距甚远,也可以获得良好的重构效果。在这种情况下,基于梯度的方法通常会陷入局部极端。此外,研究了不同噪声对重建的影响。

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