基于通用特征基函数的目标宽带RCS自适应计算

Adaptive RCS Calculation over a Wide-band Based on the General Characteristic Basis Function Method

通用特征基函数法是分析目标宽带电磁散射特性的有效方法之一,但该方法在低频点应用最高频率点构造的特征基函数计算时存在大量的冗余计算。通过提出一种基于通用特征基函数法的目标宽带RCS自适应计算方法,将待分析频段自适应划分为多个子频段,并分别在每个子频段的最高频率点构造通用特征基函数,从而可以在各个子频段使用各自的通用特征基函数计算RCS,最后将各个子频段的RCS数据进行拼接,实现待分析频段宽带RCS的计算。与传统方法相比,该方法有效的减少了在低频点的冗余计算,减少了计算时间。数值计算结果证明了该方法的有效性和精确性。

The general characteristic basis function method （GCBFM） is an efficient approach to analyze the wide -band scattering problems, but the computational complexity at lower frequency points will be increased be- cause of the use of the characteristic basis functions constructed at the highest frequency point. An adaptive wide -band radar cross section （RCS） calculation approach based on the GCBFM is proposed in this paper. In the proposed approach, the desired frequency band is adaptively divided into multiple sub -bands, and the general characteristic basis functions （GCBFs） are constructed at the highest frequency point in each sub - band. Then, the RCS data is calculated by utilizing the GCBFs obtained at the highest frequency point in each frequency band. Finally, the desired RCS data can be obtained by splicing the RCS data in each frequency band. The computational complexity at lower frequency points and the computational time are reduced significantly compared with the traditional method. Numerical results demonstrate that the proposed approach is efficient and accurate.