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 permittivit...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.展开更多
基金Supported by the National Natural Science Foun-dation of China and the Charl iang Water Resources Commission(50099620)
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.
