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Tesi etd-07162007-193258

Thesis type
Tesi di dottorato di ricerca
Genovesi, Simone
Inverse scattering procedures for the reconstruction of one-dimensional permittivity range profile
Settore scientifico disciplinare
Corso di studi
Relatore Prof. Mittra, Raj
Relatore Ing. Salerno, Emanuele
Relatore Prof. Monorchio, Agostino
Relatore Prof. Manara, Giuliano
Parole chiave
  • ___ microwave tomography
  • range profile reconstruction
  • evolutionary algorithms
  • edge-preserving regularization
Data inizio appello
Data di rilascio
Riassunto analitico
In the present work we have presented a reliable and efficient algorithm for the data inversion, which is based on a fully nonlinear data model in conjunction with an optimization technique. The reconstruction of the permittivity range profile has been tested both on
synthetic and real data to validate the electromagnetic code as well as to assess the accuracy and efficiency of the reconstruction procedure. We have studied the resolution of the algorithm and its robustness to the noise, demonstrating the ability of our procedure to be able to recognize the presence of high discontinuities even independently from the discretization fixed by the user.
As a part of the ongoing improvement of the presented method, we have addressed the implementation of a new optimization algorithm, namely the particle swarm optimization, which has been customized and enhanced for our purposes.
Finally, a detailed description of a fast and efficient procedure to evaluate the green’s function for a multilayered medium has been given. This is the groundwork useful for the next step toward a more reliable and versatile forward solver to be implemented in the inversion procedure.