| 地下目标瞬时散射的时域有限差分法数值模拟 |
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| 引用本文： | 王建,彭仲秋,谢处方.地下目标瞬时散射的时域有限差分法数值模拟[J].地球物理学报,1996,39(Z1):349-356. |
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| 作者姓名： | 王建 彭仲秋 谢处方 |
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| 作者单位： | 电子科技大学微波工程系, 成都 610054 |
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| 摘 要： | 采用时域有限差分（ＦＤＴＤ）法数值模拟电磁脉冲波的入地传输，以及地下二维目标的瞬时散射，详细讨论了ＦＤＴＤ法中主要参数的取值原则．在稳定条件下所取时间间隔随波进入不同煤质而不同，以满足因果律．通过数值计算证明，在无耗空间得到的吸收边界条件也适用于有耗媒质．数值模拟在地面接收到的地下目标的回波响应与有关文献的结果一致．
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| 关 键 词： | 时域有限差分法 吸收边界条件 瞬时散射 地下目标 |
| 收稿时间： | 1996-10-29 |
NUMERICAL SIMULATION OF TRANSIENT SCATTERING BY UNDERGROUND TARGET WITH FDTD METHOD |
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| WANG JIAN,PENG ZHONG-QIU,XIECHU-FANG.NUMERICAL SIMULATION OF TRANSIENT SCATTERING BY UNDERGROUND TARGET WITH FDTD METHOD[J].Chinese Journal of Geophysics,1996,39(Z1):349-356. |
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| Authors: | WANG JIAN PENG ZHONG-QIU XIECHU-FANG |
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| Institution: | University of Electronic Science and Technology of China, Chengdu 610054, China |
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| Abstract: | The FDTD method Is to simulate numerically the transmission of EM pulse wave into ground and the transient scattering by underground 2-D target. How to choose the main parameters in FDTD method is discussed in detail. Under the steady condition, the time setp △t is assumed to vary with the waves propagating in different mediums,so as to meet the law of cause and effect.The obsorbing boundary conditions obtained in lossles space are proved to be suitable fis well in lossy medium by munerical calculation. Numerical results of the echo response of the underground target are well apree with those of the other papers. |
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| Keywords: | FDTD method Absorbing boundary conditions Trasient scattering Underground target |
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