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本文全面介绍了非正交FD-TD方法的基本原理,推导出了其稳定条件和数值色散方程,并对其数值色散特性进行了详细分析研究。用非正交FD-TD方法在正弦波激励下对无限长三角形导体柱TM散射电流进行了计算,与矩量法(MM)结果基本吻合,证明了其有效性。在此基础上对涂敷多边形导体柱的TM散射问题进行了计算,得出远区单站RCS结果,同时为了比较给出了分别用非正交FD-TD法和等效源法计算涂敷方形导体柱的散射场分布的结果。
In this paper, the basic principle of non-orthogonal FD-TD method is introduced. The stability conditions and numerical dispersion equation are deduced. The numerical dispersion characteristics are analyzed in detail. Using the non-orthogonal FD-TD method, the TM scattering current of an infinitely long triangular conductor was calculated under sinusoidal wave excitation, which was in good agreement with the result of the moment method (MM), which proved its effectiveness. Based on this, the TM scattering problem of coated polygonal conductor post was calculated, and the results of remote RCS were obtained. For comparison, the results of non-orthogonal FD-TD method and equivalent source method Scattered field distribution of square conductor columns.