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Application of DFT in bi-static RCS calculation of complex electrically large targets
Pages: 732-738
Year: Issue:  4
Journal: Journal of Systems Engineering and Electronics

Keyword:  finite-difference time-domain (FDTD)radar cross sec-tion (RCS)discrete Fourier transform (DFT);
Abstract: To handle the electromagnetic problems of the bi-static radar cross section (RCS) calculation of scatterer in a wide fre-quency band, a finite-difference time-domain (FDTD) extrapolation method combining with discrete Fourier transform (DFT) is pro-posed. By comparing the formulas between the steady state field extrapolation method and the transient field extrapolation method, a novel extrapolation method combining with DFT used in FDTD is proposed when a transient field incident wave is introduced. With the proposed method, the ful-angle RCS distribution in a wide fre-quency band can be achieved through one-time FDTD calculation. Afterwards, the back-scattering RCS distributions of a double olive body and a sphere-cone body are calculated. Numerical results verify the validity of the proposed method.
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