| 三维频散介质中地质雷达信号的FDTD数值模拟 |
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| 引用本文： | 刘四新,曾昭发,徐波.三维频散介质中地质雷达信号的FDTD数值模拟[J].吉林大学学报(地球科学版),2006,36(1):123-127. |
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| 作者姓名： | 刘四新 曾昭发 徐波 |
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| 作者单位： | 吉林大学 地球探测科学与技术学院， 长春 130026 |
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| 摘 要： | 考虑频散介质的电磁波传播，引入随频率变化的电位移矢量D，并对电场强度E和电位移D进行标准化。开发出一种计算介电常数随频率变化满足Debye关系的频散介质中麦克斯韦方程的时间域有限差分（FDTD）解法，并编写了相应的计算原代码。在边界部分引入假象的介电常数和磁导率，实现了边界的无反射吸收，避免了Berenger完全匹配层中场分裂过程，提高了计算效率。计算实例可以看出频散介质中波的传播情况。
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| 关 键 词： | 地质雷达 麦克斯韦方程 时间域有限差分 频散介质 |
| 文章编号： | 1671-5888(2006)01-0123-05 |
| 收稿时间： | 2005-03-10 |
| 修稿时间： | 2005年3月10日 |
FDTD Simulation of Ground Penetrating Radar Signal in 3-Dimensional Dispersive Medium |
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| LIU Si-xin,ZENG Zhao-fa,XU Bo.FDTD Simulation of Ground Penetrating Radar Signal in 3-Dimensional Dispersive Medium[J].Journal of Jilin Unviersity:Earth Science Edition,2006,36(1):123-127. |
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| Authors: | LIU Si-xin ZENG Zhao-fa XU Bo |
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| Institution: | College of GeoExploration Science and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | To study propagation characteristic of radar wave in a dispersive medium, frequency dependent flux density D was introduced, and electromagnetic field E and flux density D were norma lized. A finite difference time domain (FDTD) algorithm is developed to solve Maxwell’s equation in a dispersive medium, in which the dielectric constant varies with frequency and Debye relationship is satisfied. Assumed dielectric constant and magnetic permeability were introduced to realize the non reflectively absorbing, which avoids the split of wave components in normal Berenger PML. Simulated example illustrates the wave propagation in a dispersion medium. |
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| Keywords: | ground penetrating radar Maxwell’s equations finite difference time domain dispersive medium |
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