Estimates Of Real-time Rcs Of Complex Targets The High Frequency Region Coated With Radar Absorbing Materials

With the development of the computer technology, Targets can be accurately modeled by NURBS in virtue of AutoCAD. In addition combining OpenGL technology, we can translate the source shape data of targets displayed on the computer screen to the data for RCS computing. "Graphical Electromagnetic Computing (GRECO)" was presented in these conditions, which has many merits such as detecting shadowed regions automatically, computing in real time and accurately and so on. At present GRECO is regarded as one of the most valuable methods of Radar Cross Section (RCS) computation in the high-frequency region.Depending on these conditions, several researches have been completed in this paper: Firstly, Calculating RCS of complex conducting targets has been accomplished by GRECO method. The high-frequency RCS of targets are obtained through Physical Optics (PO) and Incremental Length Diffraction Coefficients (ILDC) respectively. At the same time some techniques for speeding up the computation are applied in this paper. Secondly, the precision of diffraction field of the edges of targets has been greatly advanced by improving the original method of detecting edges. The RCS of targets coated with Radar Absorbing Material (RAM) in the high-frequency region have been further computed. RCS of facetsof targets coated RAM was resolved by combining Impedance Boundary Condition (IBC) and Geometric Optics (GO) and RCS of those edges were approximated by computing the RCS of edges of impedance wedge through Method of Equivalent Currents. Finally, RCS of targets were analyzed under the linear polarization and circular polar mode.Good argument has been found comparing the results calculated with this present approach with the theoretical ones and related literatures. The method adopted in this paper could analyze RCS of complex radar targets in the high-frequency region rapidly and efficiently in practical application.