ASA 127th Meeting M.I.T. 1994 June 6-10

3aSAb9. Phase-space footprints of truncated periodicity: Time domain wave-oriented data processing.

L. Carin

L. B. Felsen

T.-T. Hsu

D. Kralj

Dept. of Elect. Eng., Polytech. Univ., 6 MetroTech Ctr., Brooklyn, NY 11201

A companion paper [L. B. Felsen et al., paper 3aSAb8] has dealt with phase space processing techniques that extract frequency domain (FD) Bragg-modulated phenomenologies from scattering data pertaining to truncated periodic arrays of filaments. Displayed in subdomains of the (x,z,k[sub x],k[sub z])[sub (omega)] phase space accessed by windowed and global transforms, the footprints of the dispersive truncated Bragg modes are of special interest. These processing techniques are now extended and applied to short-pulse time domain (TD) synthetic scattering data from the filament arrays. The phase space is enlarged to (x,z,t,k[sub x],k[sub z],(omega)), with a correspondingly enriched choice of subdomain processing options and visualizations. Again, special attention is given to the truncated TD Bragg modes whose behavior is governed by an instantaneous dispersion relation extracted by the processing. Specific plots include the subdomains (t,(omega)), (t,p[sub x]), and ((omega),k[sub x]), which complement the FD results (p[sub x](identically equal to)k[sub x]/(omega)). [Work supported by AFOSR.]