On the effects of microgeometry on RCS

When calculating the radar cross section (RCS) of electrically large complex objects with computational electromagnetics tools, computer aided design models of the objects are required. Guidelines regarding the level of fidelity with which the models need to be constructed to achieve specific levels of accuracy, however, remain unclear. In this paper the effects of microgeometry features on the RCS of two electrically large canonical objects are investigated in order to help clarify when such features become important to include.