Three-dimensional Fresnel data inversion using MR-CSI algorithm

In this paper we used a full vector three-dimensional (3D) multiplicative-regularized contrast source inversion (MR-CSI) method for inverting multi-frequency microwave scattered field data measured by the Institut Fresnel, Marseille, France. The 3D experimental setup consists of a transmitting and a receiving antenna. Twenty-one frequencies from 3 GHz to 8 GHz are used. The detailed setup of the apparatus and some initial tests can be found. The MR-CSI method had been applied to invert two dimensional data measured by the the Institut Fresnel. When reconstructing objects from these data, we carried out a ´blind´ inversion without explicitly taking into consideration any a priori information regarding the type of objects (either dielectric or metallic) to be reconstructed. The only a priori information which was used in the inversion is the positivity constraint on both permittivity and conductivity. By using such minimum a priori information the MR-CSI was proved to be able to invert these data sets accurately and within reasonable amount of time.