Electromagnetic scattering from metal targets in half-space environment with three-dimensional spatial interpolation method

A new acceleration method is proposed for efficiently solving the electromagnetic scattering from metal targets in half-space. In order to further speed up the calculation efficiency, an efficient three-dimensional spatial interpolation method is introduced for half-space Green’s function. Tabulation and IDW interpolations are performed on the Sommerfeld integrals for the half-space Green’s function. The efficiency can be improved 20 times higher than that of the traditional combined field integral equation(CFIE). Numerical results show that this method can significantly reduce the filling time of impedance matrix and maintain high accuracy.