Fast calculation of wide angle radar cross section(RCS) pattern of 3-D objects based on multinomial interpolation approximation and spline approximation was presented. When interpolation technique was introduced in finite difference time domain(FDTD) method, the calculation time was reduced. Firstly, several angles of incidence were chose in whole range of angle, and FDTD calculation were employed with those angles one by one, and the tangent electric and magnetic values on extrapolation boundary were obtained. Then, the approximating functions related to angle of incidence were gained. Secondly, the tangent electric and magnetic values on extrapolation boundary were calculated by approximating function in whole range of incident angle. Finally, wide angle RCS pattern of 3-D object were calculated by a near-to-far field transformation. The numerical results are in good agreement with the results achieved by the method of FDTD at any incident angle, even if several interpolation node is used, and the computational time is reduced.
Sun Weiping, Wu Zeyan.Fast calculation of wide angle RCS pattern of objects based on interpolation technique and FDTD method[J] JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2008,V34(04): 447-451