三维散射体宽带RCS频率响应的快速算法:渐进波形估计技术加速的区域分裂法

本文基于渐近波形估计(AWE)技术和区域分裂法(DDM)快速预测有限长三维柱体RCS的频率响应.首先采用区域分裂法结合频域有限差分(FDFD-DDM)计算柱体表面等效电流和磁流在某一给定频率展开的Taylor级数,然后通过Padè逼近将Taylor级数转化为有理函数,由此可获得柱体在任一频率入射波照射下的表面等效电流和磁流,进而计算出RCS频率响应特性.本文结果和文献结果吻合较好,证明了本文方法的正确性,另外相对于直接采用FDFD-DDM法而言,计算效率得到了显著的提高.

Fast RCS Calculation of 3-D Objects over a Frequency Band Based on Domain Decomposition Method in Conjunction with Asymptotic Wave Evaluation Technique

The Domain Decomposition Method (0DM) in conjunction with the asymptotic waveform evaluation (AWE) technique is applied to obtain the radar cross-section (RCS) of a 3-D cylinder over a frequency band. The equivalent electric current and magnetic current on the surface of the cylinder are firstly expanded in Taylor's series over a given frequency and solved by FDFDDDM . Then the Taylor's series are converted to rational functions via Pade approximation and the surface equivalent electric current and magnetic current can be achieved at any frequency within a desired frequency band, which are used to calculate the RCS of the cylinder. A good agreement between our results and the results from reference verifies the validity of this technique. In addition, the computational efficiency is considerably improved compared with the traditional FDFD-DDM.