MUSIC-type imaging of dielectric spheres from single-frequency, asymptotic and exact array data.

ISBN: 978-1-934142-02-8 - http://piers.org/piersproceedings/piers2k7PragueProc.phpInternational audienceImaging of a dielectric sphere from its Multi-Static Response (MSR) matrix at a single frequency of operation is considered herein via a MUSIC-type, non-iterative method. Synthetic data are both asymptotic ones and data calculated by the Coupled Dipole Method (CDM) which, in contrast, models the wavefield in exact fashion. Comparisons of scattered fields, distributions of singular values, and MUSIC images are carried out. In particular, even far beyond the domain of application of the asymptotic modeling (on which the analysis of the MSR matrix is based), it is shown that fair localization of the sphere is achieved from CDM data