Investigation on wide-band scattering of a 2-D target above 1-D randomly rough surface by FDTD method.
Finite-difference time-domain (FDTD) algorithm with a pulse wave excitation is used to investigate the wide-band composite scattering from a two-dimensional(2-D) infinitely long target with arbitrary cross section located above a one-dimensional(1-D) randomly rough surface. The FDTD calculation is performed with a pulse wave incidence, and the 2-D representative time-domain scattered field in the far zone is obtained directly by extrapolating the currently calculated data on the output boundary. Then the 2-D wide-band scattering result is acquired by transforming the representative time-domain field to the frequency domain with a Fourier transform. Taking the composite scattering of an infinitely long cylinder above rough surface as an example, the wide-band response in the far zone by FDTD with the pulsed excitation is computed and it shows a good agreement with the numerical result by FDTD with the sinusoidal illumination. Finally, the normalized radar cross section (NRCS) from a 2-D target above 1-D rough surface versus the incident frequency, and the representative scattered fields in the far zone versus the time are analyzed in detail.
School of Science, Xidian University, Xi'an, Shaanxi Province, China. lijuan029@yeah.net
Juan
J
Li
Li-Xin
LX
Guo
Yong-Chang
YC
Jiao
Ke
K
Li
D000465:Algorithms; D003198:Computer Simulation; D004574:Electromagnetic Fields; D008962:Models, Theoretical; D011825:Radar; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation