Abstract:

To handle the electromagnetic problems of the bi-static radar cross section (RCS) calculation of scatterer in a wide frequency band, a finite-difference time-domain (FDTD) extrapolation method combining with discrete Fourier transform (DFT) is proposed. 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 full-angle RCS distribution in a wide frequency 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.