Scattering from Elements of Bodies with Complex Shaped Surfaces

In order to create new inconspicuous vehicles for contemporary radar detection systems or to cloak the existing ones some effective instruments for defining the object Radar Cross Section (RCS) are needed. The criterion of truth in this case always is experimental measurements, but in many cases it is difficult or sometimes impossible to provide it. So, one need reliable and efficient calculation methods in order to estimate radar detectability of a model of the complex shape object for typical radar wavelengths. The existing calculation methods assume the scattering field obtaining for each small parts (each facets) of the investigated model surface. For radar range such facets should be quite small and the it's the number can be very significant, so the scattered field calculation for all such facets can take a lot of time. On the other hand the real radar measurements frequently provides with low accuracy, so the high accuracy in calculations is not needed. It this paper we are going to obtain the approximation formulae for quick estimation of RCS for a complex shape object.