DISCRIMINATION OF BURIED TARGETS VIA THE SINGULARITY EXPANSION

A problem of recent interest is the identification of buried unexplode d ordnance (including mines). This paper reviews recent progress in th e use of the singularity expansion method for electromagnetic and acou stic/elastodynamic scattering for discriminating the various types (sp ecific models with prescribed shapes and materials). Each type having an aspect-independent set of natural frequencies, these can be used as a set of target signatures in a library. Three different types of suc h natural frequencies (and associated pole residues) are discussed.