Different Methods That Reduce Cost in Monostatic Rcs Computations for Mom Accelerated by Mlfma

The problem of computing the monostatic Radar Cross Section with the Method of Moments accelerated by the multilevel Fast Multipole algorithm is considered. For electrically large objects the problem becomes too expensive in terms of computational work. This paper suggests two methods that can reduce the work, the Minimal Residual Interpolation method and a new fast approximate method related to the Fast Physical Optics method. Numerical experiments show that the new method gives reasonable results, while reducing the work substantially for large objects.