A numerical scheme to obtain the RCS of serrated targets using CG-FFT

A numerical scheme to obtain the radar cross section (RCS) of scattering bodies of resonant size with serrated structure is described. The RCS is obtained by solving the electric field integral equation (EFIE) using the conjugate gradient-fast Fourier transform method (CG-FFT). With this combination, the computational time required to solve scattering problems of resonant size bodies is much less than the time required by the ordinary conjugate gradient method and the method of moments. On the other hand, since the spatial derivatives are replaced with simple multilocations in the transformed domain. Some of the computational difficulties present in the ordinary conjugate gradient method and the method of moments do not exist here. The choice of a suitable set of basis and testing functions to discretize the EFIE leads to obtain a very accurate efficient CG-FFT procedure. Finally, since the method is iterative, it is possible to know the accuracy in a problem solution. The numerical results also show that conducting serrated structure can be applied to reduce the RCS values of straight wedge so long as the shape and size are selected properly.