A Reconstruction Strategy Based on the DORT Method for Imaging Finite Dimension Scatterers

This paper presents a two stage strategy for the electromagnetic imaging of unknown lossless profiles. The first step is aimed at providing the localizations and an estimate of the number of the regions‐of‐interest (RoIs) where the scatterers are supposed to be located through the application of the DORT method enhanced with a suitable processing of the information associated with the eigenvalues of the time reversal operator. Towards this aim, a suitable procedure is developed and applied in an extended and unsupervised fashion for localizing the finite‐dimension scatterers under test. Successively, the second stage is devoted to reconstruct the unknown scatterer distributions by means of an iterative multi‐resolution non‐linear inversion performed only in the RoIs determined during the previous step.