The Rapid Analysis Of High Frequency Electromagnetic Scattering Rtvu Complex Target

How to efficiently obtain the radar cross section (RCS) of objects has become a hot topic in modern military. In the two most commonly used methods, field measurement provides relatively accurate and clear results, but it requires complex operations and costs much. Therefore, computational electromagnetics that is based on computer simulation analysis has become an efficient method to evaluate the RCS. On the basis of the physical optics (PO) method and fast algorithms are adopted to analyze the RCS, such as the F-15or a plane carrier, over a range of angles and frequencies. This paper is mainly divided into four parts to introduce high frequency techniques.The first part mainly introduces the theoretical basis of the PO and the shooting and bouncing rays (SBR) method, and provides a brief introduction of the RCS solution process.The second part focuses on the fast physical optics (FPO) method that integrates the PO method with domain decomposition. A series of operations including phase compensation, interpolation, restore, and aggregation is utilized to evaluate the RCS over a range of angles and frequencies. We also apply the FPO idea on the frequency sweeping problems of the SBR method.In the third part, based on the FPO method, the multilevel fast physical optics (MLFPO) method is described that implements multi-layer decomposition, interpolation, and aggregation. The ACA method is used to accelerate MLFPO.In the last part, to increase the accuracy of the high-frequency method and considering the edge diffraction effect, the SBR method is combined with the truncated wedge incremental length diffraction coefficients (TW-ILDCs) to analyze the RCS with different polarization. Then the RCS of an object when coated with different materials and in different depth is analyzed. The results are compared between our method and the commercial software.