Microwave Imaging of Multiple Dielectric Objects by FDTD and APSO

摘要

An imaging approach to clear detection of two-dimensional geometries is proposed in thispaper. The imaging reconstruction of multiple dielectric objects is retrieved by finite differencetime domain (FDTD) method and the asynchronous particle swarm optimization (APSO) todetermine the shape, location and permittivity of each dielectric object. The forward problem issolved based on the subgrid FDTD method by using EM pulse to illuminate the dielectric object.In order to reduce the number of the unknown parameters for the imaging problem, the shapefunction of the object is interpolated in terms of the cubic spline. The inverse problem isresolved by an optimization approach, and the global searching scheme APSO is then employedto search the parameter space. Numerical results demonstrate that, even when the initial guessis far away from the exact one, good reconstruction can be obtained.