Reconstruction of a high-contrast penetrable object in pulsed time domain by using the genetic algorithm

A three dimensional dielectric object having high relative dielectric constant of 7.0 and large size of wavelength cube is reconstructed from the scattered fields in the space-time domain when plane waves of gaussian pulse shine the object. This reconstruction is obtained from the iterative inversion method that minimizes the cost function by using the Levenberg-Marquardt algorithm and the genetic algorithm to find its global minimum, where the cost function is defined as the squared magnitude of the difference between the measured fields and the calculated fields from the assumed profile of the object. The scattered fields are calculated by the method of FDTD and measured fields used for reconstruction are assumed to have the measurement error