A Dual-Model-Base Adaptive Sampling Method for Fast Computation of Broadband Scattering

A dual-model based adaptive sampling method is proposed for calculating the broadband electromagnetic scattering fast and accurately. An adaptive scheme is used for generate sampling frequency points adaptively. Both the rational function and the cubic-spline (CS) models are applied in the scheme for interpolating the frequency sweep curve. The induced current at frequency samples is computed by the method of moment (MoM) and accelerated by multilevel fast multipole algorithm (MLFMA). The induce current at other frequency points is evaluated by the proposed dual-model adaptive sampling strategy. The final numerical results demonstrate that the adaptive algorithm enable to obtain the broadband radar cross section (RCS) curve with high-precision and reduce the computation time significantly.