Calculation Of The Radar Cross Section For Open-ended Cavities

The open-ended cavity, a very strong scatter mechanism, plays a significant role in targets'stealth technology. So it is important to research the scattering characteristic of cavities. This thesis focuses on the calculation of the radar cross section(RCS) of open-ended cavities. After a simple analysis of the methods used in calculating the RCS of open-ended cavities, iterative physical optics(IPO),as a kind of high frequency methods, is adopted for its simple physical process and easy to program. Then some improved algorithms of IPO are introduced: Forward-backward iterative physical optics(FBIPO),the special IPO for dielectric coated cavities and the subdomains splicing technique in IPO. Method of moment (MOM) is adopted as a low frequency method. Then IPO and MOM are combined to calculate the RCS of arbitrarily complex cavities. Finally each algorithm is applied separately to calculate the RCS of different cavities models. All results agree well with the literatures.