MICROWAVE INVERSE SCATTERING - QUANTITATIVE RECONSTRUCTION OF COMPLEXPERMITTIVITY FOR DIFFERENT APPLICATIONS

This paper deals with two different quantitative inversion algorithms for reconstructing the complex permittivity profile of bounded inhomog eneous objects from measured scattered field data. The first algorithm involves an imaging method with single frequency excitation and multi incidence illumination and the second algorithm involves a method with synthetic pulse (multifrequency mode) excitation for objects surround ed by free-space or buried in stratified half-space media. Transmissio n or reflection imaging protocols are considered depending on aimed ap plications : microwave imaging in free-space from far-field data for t arget identification, microwave imaging from near-field data for nonde structive testing (NDT), microwave tomography of buried objects for mi ne detection and localization, civil engineering and geophysical appli cations. An Edge-Preserving regularization scheme leading to a signifi cant enhancement in the image reconstructions is also proposed. The me thods are illustrated with synthetic and experimental data.