【摘要】 通过分析时域有限差分 (FDTD)法的特点和高频电磁脉冲在 Yee氏网格中的传播规律 ,导出了适于地质雷达正演的理想频散关系。该频散关系即考虑了 FDTD法的收敛性和稳定性 ,也考虑了高频电磁波在 Yee氏网格中的传播特点。数值试验表明 ,这一关系能有效压制数值频散现象 ,真实反映地质雷达波在地下介质中的传播规律。将之用于实际计算 ,取得满意效果更多还原

【Abstract】 By analyzing the characteristic of FDTD method and the penetrating rule of high frequency electromagnetic pulse, a ideal numerical dispersive relation has been proposed in the paper. Except stability and astringency of FDTD, propagation characteristic of EM wave in Yee’s grid is also taken account in ideal numerical dispersive relation. The numerical test indicates that the dispersive relation can suppress numerical dispersion successfully and simulate the radiation process of GPR pulse reliably. Using the theory in forward modeling, a satisfactory result has been obtained.更多还原