Title :
A PSTD algorithm for general dispersive media and its applications to GPR simulations
Author :
Liu, Q.H. ; Fan, G.-X.
Author_Institution :
Klipsch Sch. of Electr. & Comput. Eng., New Mexico State Univ., Las Cruces, NM, USA
Abstract :
The authors develop a pseudospectral time-domain (PSTD) algorithm for the simulations of transient electromagnetic waves in highly dispersive media. A general formulation is proposed for arbitrary dispersion by expanding the dispersion relation into a summation of simple poles. By treating the spatial derivatives in the partial differential equations with fast Fourier transform (FFT), orders of magnitude reduction in the number of unknowns can be achieved. The wraparound effect in the FFT is eliminated by using the perfectly matched layer (PML) for dispersive media
Keywords :
geophysical prospecting; geophysical techniques; radar applications; radar cross-sections; radar theory; remote sensing by radar; terrestrial electricity; PSTD algorithm; buried object detection; dispersion relation; exploration; fast Fourier transform; general dispersive media; geoelectric method; geology; geophysical measurement technique; ground penetrating radar; highly dispersive media; partial differential equations; perfectly matched layer; prospecting; pseudospectral time-domain algorithm; radar remote sensing; radar scattering; radar theory; simple poles summation; simulation; soil; spatial derivatives; terrestrial electricity; transient electromagnetic wave; wraparound effect; Application software; Computational modeling; Convolution; Dispersion; Frequency; Ground penetrating radar; Maxwell equations; Perfectly matched layers; Permittivity; Time domain analysis;
Conference_Titel :
Geoscience and Remote Sensing Symposium Proceedings, 1998. IGARSS '98. 1998 IEEE International
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-4403-0
DOI :
10.1109/IGARSS.1998.702854
