Near to Far Field Transformation Algorithm for RCS Analysis of Large Electrical Objects

Preliminary analyses of radar cross section (RCS) in the design process of military weapon systems are very important. Recently, weapon systems such as missiles and fighter jets are adapted for large-size electrical objects in preparation for the wavelengths used in radar. Therefore, it is difficult to pre-analyze the RCS through commercial simulation programs unless a high-performance computing power is provided. To solve these problems, we propose a near to far field transformation algorithm that can be applied to domain decomposition analyses. First, we analyzed the theoretical equation and the physical meaning of the algorithm and matricized the integral equation to a constant part and a scattering part. Then, the Moore-Penrose pseudo-inverse matrix method was used to solve the scattering characteristics. We have also studied the possibility of extracting the far field RCS from near field data.