An efficient method for analyzing the wideband RCS of multi-scale objects based on SAIM and CAT

The subdomain adaptive integral method (SAIM) in conjunction with the Chebyshev approximation technique (CAT) is utilized to efficiently analyze the wideband radar cross section (RCS) of multi-scale objects in this paper. The SAIM can divide the whole object into several subdomains, each of which can be independently solved with AIM. The CAT is employed to expand the current coefficients at a small number of Chebyshev frequency sampling points to any frequency point over the entire desired frequency band. In addition, the application of the Maehly approximation can improve the computational accuracy. Numerical examples show that the proposed SAIM-CAT can greatly reduce the computation time without loss of accuracy.