In this paper, a two-dimensional (2-D) finite-difference time-domain method (FDTD) scheme is used to simulate the transient scattering characteristics of buried objects, which are modeled by columns of arbitrary permi...In this paper, a two-dimensional (2-D) finite-difference time-domain method (FDTD) scheme is used to simulate the transient scattering characteristics of buried objects, which are modeled by columns of arbitrary permittivities, conductivities, and sizes. The FDTD soil is modeled by isotropic, homogeneous and lossy media. The standing-traveling wave boundary condition (STWBC) that can simplify calculation and save CPU storage is used for modeling physical absorbers inside the FDTD computational domain. Reflection of electromagnetic pulses incident on a layered medium and transient scattering by the ground and an underground air square cylinder are computed. These results verify the validity of the FDTD scheme by comparisons with those shown in some references. Numerical results presented in the final part of this paper are desirable and meaningful, explicitly distinguishing echo waves stemming from the ground and the buried objects. Key words FDTD - subsurface targets - transient response - electromagnetic pulse - STWBC CLC number O 451 Foundation item: Supported by the National Natural Science Foundation of China and the Changjiang Water Resources Commission (50099620)Biography: Gong Zhu-qian (1971-), male, Ph. D candidate, research direction: electromagnetic scattering.展开更多
文摘In this paper, a two-dimensional (2-D) finite-difference time-domain method (FDTD) scheme is used to simulate the transient scattering characteristics of buried objects, which are modeled by columns of arbitrary permittivities, conductivities, and sizes. The FDTD soil is modeled by isotropic, homogeneous and lossy media. The standing-traveling wave boundary condition (STWBC) that can simplify calculation and save CPU storage is used for modeling physical absorbers inside the FDTD computational domain. Reflection of electromagnetic pulses incident on a layered medium and transient scattering by the ground and an underground air square cylinder are computed. These results verify the validity of the FDTD scheme by comparisons with those shown in some references. Numerical results presented in the final part of this paper are desirable and meaningful, explicitly distinguishing echo waves stemming from the ground and the buried objects. Key words FDTD - subsurface targets - transient response - electromagnetic pulse - STWBC CLC number O 451 Foundation item: Supported by the National Natural Science Foundation of China and the Changjiang Water Resources Commission (50099620)Biography: Gong Zhu-qian (1971-), male, Ph. D candidate, research direction: electromagnetic scattering.
