WAVE-ORIENTED PROCESSING OF SCATTERED FIELD DATA FROM A PLANE-WAVE-EXCITED FINITE ARRAY OF FILAMENTS ON AN INFINITE DIELECTRIC SLAB

In a companion paper, we presented the formulation and solution for ti me-harmonic plane wave fields scattered by truncated periodic and aper iodic arrays of infinitely long filaments on an infinite dielectric sl ab. The solution was constructed so as to highlight the coupled phenom enologies associated with slab loading of the Floquet mode beams chara cteristic of the truncated arrays and with the slab-guided leaky modes excited by these arrays, Asymptotic reduction of the solution yielded a parameterization of the scattered fields and a numerically accurate algorithm, based on physically observable ray- and mode-field constit uents, The present study is concerned with the inverse procedure of ex tracting from the scattered field data the phenomenological footprints of the scattering mechanisms found by forward problem asymptotics; th is information is relevant to target classification and identification , The data processing tools involve Gaussian windowed transforms and s uperresolution algorithms that yield projections onto appropriate subd omains of the (space)-(spectral wave number) phase space, A variety of examples demonstrate physically and quantitatively the interplay of F loquet-mode and leaky-mode phenomena, and how these are affected by ch anges in the problem parameters, Of special interest is the performanc e of superresolution algorithms for ''cleaning up'' the diffuse Gaussi an window ed phase space distributions, in the absence and presence of system noise.