Fast and Accurate Cascaded Particle Swarm Gradient Optimization Method for Solving 2-D Inverse Scattering Problems
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Fast and Accurate Cascaded Particle Swarm Gradient Optimization Method for Solving 2-D Inverse Scattering Problems摘要
In this paper, a fast and accurate technique for solving the inverse scattering problem of two-dimensional objects made of perfect conductor is proposed. In this technique which is called cascaded particle swarm gradient, the solving procedure is properly divided into two steps. In the first step, the position and the equivalent radius of the unknown objects is estimated while in the second step, the accurate shape function of the objects is determined. The former step is performed by a global optimizer namely particle swarm optimization (PSO) technique and the latter is carried out by the well-known gradient method. In this work, the forward scattering problem is solved by the equivalent source method. Several numerical examples are presented to examine the proposed algorithm especially in handling the challenging multi-object problems with concave shape functions in the presence of measurement errors. The results show that the proposed algorithm is about 75 times faster than a conventional PSO while yielding a higher accuracy.
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