Tvu Radar Cross Section Of High-frequency Method

With great improvement of radar stealthy and anti-stealthy technique, the research of the Radar Cross Section (RCS) of electrical large object has received special attentions in this field. Among a variety of methods used to obtain target scattering. Computer simulation is the most useful and economical way recently. In order to calculate RCS of electrical large object efficiently, the high frequency algorithms including Physical Optics (PO). Equal Current Method (ECM). Iterative Physical Optics (IPO). Segmented Iterative Physical Optics (S-IPO). Shooting and Bouncing Rays (SBR) are analyzed and discussed in this thesis.First of all. the basic theories of high frequency methods are summarized for analyzing RCS of complex object. Secondly, Ludwig integral algorithm is applied to calculate PO integral of plane facets and a novel method is proposed in this paper to solve the shadowing problem. Thirdly. Current mode combined with Ludwig method is used for curved triangle facet while Fourier Transform is applied to compute field integral of curved rectangle facet efficiently. Fourthly, as a revision of PO method, ECM is presented to obtain the contribution of wedge diffraction. Finally. IPO,Segmented IPO and SBR are presented for cavity scattering problems. Numerical results have demonstrated the accuracy and validity of high frequency methods discussed in this dissertation.