A Hybrid Method of Asymptotic Waveform Estimation and Hierarchical Matrix for Fast Acquisition of Broadband RCS

A hybrid method combining asymptotic waveform estimation (AWE) technique and hierarchical matrix is proposed for calculating broadband RCS. Compared with traditional AWE, when calculating the coefficients of the derivatives of the impedance matrix, a hierarchically off-diagonal low-rank (HODLR) is introduced to calculate the inverse matrix of the impedance matrix, greatly reducing calculation time. Numerical example show that the proposed method effectively improves computational efficiency without losing accuracy.