Boundary elements method based on a preliminary discretization

A new numerical method is presented for solving diffraction problems. The method is based on the boundary elements idea, i.e. the unknown values are the field values on the surface of the scatterer. Instead of numerical approximation of the initial (continuous) problem, an analogue of boundary element method is constructed for an approximate lattice problem. As the result, the accuracy of the method decreases, but it becomes very easy for implementation since the Green's function stop being singular. For uniqueness of the solution, the method is constructed by analogy with the CFIE approach developed for the classical boundary element method.