RCS analysis code for complex targets modelled with NURBS surfaces

In this communication a FORTRAN code, RANURS, to analyze the Radar Cross Section (RCS) of electrically large complex targets is presented. The scattered fields is calculated by using PO+PTD approach. The following contributions to the RCS are taken into account: reflected and diffracted fields, double reflected and diffracted-reflected fields. The targets are modelled by using curved patches (NURBS). In addition to be exact and efficient, the most important characteristic of this code is to be compatible with several geometric computer aided design programs through the IGES standard (Initial Graphics Exchange Specification).