A Hybrid Approach for Characterizing Linear and Nonlinear Electromagnetic Scattering: Theory and Applications

Report No. ARL-TR-6261
Authors: DaHan Liao
Date/Pages: November 2012; 62 pages
Abstract: A hybrid physics-based solver is developed for studying the harmonic scattering of circuit-component-loaded objects. The proposed approach features a combination of three-dimensional (3-D) electromagnetic field simulations—of both the full-wave and the asymptotic types—in the propagation and radio frequency (RF) component domains, and Simulation Program with Integrated Circuit Emphasis (SPICE) simulations in the circuit domain. In effect, a systematic framework is established for attaining generalized approximate solutions of the multiscale harmonic radar scattering problem. The solver is applied for analyzing the conventional (linear) and nonlinear scattering components from an RF circuit-loaded object placed in near-ground and through-wall settings: the scattering responses as functions of incident power, standoff distance, and azimuth angle are considered; the localization of the scatterer using both the linear and the nonlinear returns is also demonstrated by exploiting a subspace-based time-reversal method.
Distribution: Approved for public release
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Last Update / Reviewed: November 1, 2012