ELECTROMAGNETIC INVERSE SCATTERING - RETRIEVABLE INFORMATION AND MEASUREMENT STRATEGIES

With reference to inverse scattering from an unknown object of limited extension embedded in a homogeneous background at a fixed frequency, we show that only a finite-dimensional representation of the unknown c ontrast can be hopefully retrieved. Exploiting the quasi-band-limitedn ess property of scattered fields, an accurate upper bound to the dimen sion of such a space is evaluated in both the single incidence and mul tiview cases. Moreover, effective schemes are given to collect all the information available from the scattering experiments in a nonredunda nt manner. As a by-product, an optimal (minimally redundant) sampling strategy for the monostatic radar cross section is also provided. Fina lly, we briefly discuss how the requirement for a globally effective a nd reliable solution scheme can lead to a reduction of the actually re trievable information.