An efficient algorithm for the RCS modulation prediction from jet inlet-engines

The electromagnetic scattering from the interior of a complex jet engine inlet contributes significantly to the overall radar cross section (RCS) of a modern jet aircraft. Previously we have presented a general multi-domain and multi-method coupling scheme, based on generalized scattering matrices computations of three-dimensional inlet subdomains. This method is really suitable in a context of parametric investigations (local inlet engine modifications). In this paper we discuss a new algorithm providing the radar modulation due to a set of rotating blades computed with only one solution for any blade position. A validation of this method is presented on a simplified rotating structure connected with an evolutive inlet.