Kim, SW Kim, SY 2024-01-19T16:38:45Z 2024-01-19T16:38:45Z 2022-03-07 2000 0277-786X https://pubs.kist.re.kr/handle/201004/118198 A 3-dimensional FDTD simulator is implemented for the detection of an underground tunnel by employing a cross-borehole pulse radar. The antenna and underground tunnel are modeled equivalently by employing the thin-wire model and the contour-path scheme, respectively. In various underground situations, the received radar signals are calculated numerically. But the FDTD simulator requires large computational resources because its spatial sampling grid is very fine. As a detour, a hybrid FDTD/PSTD method is suggested here. Since the spatial sampling grid of PSTD is coarser than that of FDTD, the hybrid FDTD/PSTD method may be expected more efficient than the FDTD method. The possibility of a hybrid FDTD/PSTD simulator is verified in a simple 1-dimensional case. English SPIE-INT SOC OPTICAL ENGINEERING A fully three-dimensional simulator for pulse borehole radar using the hybrid FDTD/PSTD Conference 10.1117/12.390656 1 2nd International Conference on Subsurface Sensing Technologies and Applications, v.4129, pp.524 - 534 2nd International Conference on Subsurface Sensing Technologies and Applications 4129 524 534 US SAN DIEGO, CA 2000-07-31 SUBSURFACE SENSING TECHNOLOGIES AND APPLICATIONS II 000166690700056 2-s2.0-0033713567 Proceedings Paper