Interpolation to increase facet resolution for RCS

Abstract

Efforts in using a surface interpolation technique to improve flat triangular facet models are shown. The authors performed RCS (radar cross section) calculations on a triangular faceted sphere, created a new sphere using the interpolation technique, and re-performed the RCS calculations. The original model was created with a uniform radius, ensuring that the RCS was as accurate as possible before interpolation. Increasing the patch resolution on the surface of the sphere results in an improved RCS calculation. The authors then performed the same process for an ogive-shaped object, for which the theoretical value is also well-defined. It can also be seen here that, if there is an area on the original model that is slightly incorrect, smoothing the model using the interpolation technique can result in values farther from those of theory. In addition, the range profile of an aircraft wing is examined before and after interpolation. It is evident that although the surface of the object has not changed significantly, there is a change in the range profile. >