TY - GEN
T1 - Ray tracing of CMP antenna array GPR system
AU - Feng, Xuan
AU - Sato, Motoyuki
AU - Liu, Cai
PY - 2009
Y1 - 2009
N2 - There is much interest in vehicle mounted array GPR systems for landmine detec- tion and work is being carried out on various national, because high speed array GPR systems can sweep a large area in a relatively short time to improve performance and efficiency. We devel- oped the vehicle mounted stepped-frequency (SF) CMP antenna array GPR system. The system has three pairs of Vivaldi antennas that configure a symmetrical CMP antenna array. Based on this configuration, multi-offset CMP data gather can be acquired at every measurement posi- tion. Migration is an important signal processing method that can improve signal-clutter ratio and reconstruct subsurface image. Diffraction stacking migration and Kirchhoff migration sum amplitudes along the migration trajectory that generally is hyperbolic. But when the ground surface varies acutely, we have to modify the migration trajectory by the technique of ray tracing. We compute the travel time between transmitter, receiver and each subsurface scattering point, and search the propagation ray depending on the Fermat's principle. The method is tested by an experiment data acquired by the SF CMP antenna array GPR system. The target is a metal ball that is buried under a sand mound. A nice result of ray tracing is shown in the case.
AB - There is much interest in vehicle mounted array GPR systems for landmine detec- tion and work is being carried out on various national, because high speed array GPR systems can sweep a large area in a relatively short time to improve performance and efficiency. We devel- oped the vehicle mounted stepped-frequency (SF) CMP antenna array GPR system. The system has three pairs of Vivaldi antennas that configure a symmetrical CMP antenna array. Based on this configuration, multi-offset CMP data gather can be acquired at every measurement posi- tion. Migration is an important signal processing method that can improve signal-clutter ratio and reconstruct subsurface image. Diffraction stacking migration and Kirchhoff migration sum amplitudes along the migration trajectory that generally is hyperbolic. But when the ground surface varies acutely, we have to modify the migration trajectory by the technique of ray tracing. We compute the travel time between transmitter, receiver and each subsurface scattering point, and search the propagation ray depending on the Fermat's principle. The method is tested by an experiment data acquired by the SF CMP antenna array GPR system. The target is a metal ball that is buried under a sand mound. A nice result of ray tracing is shown in the case.
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M3 - Conference contribution
AN - SCOPUS:84899030724
SN - 9781618390554
T3 - Progress in Electromagnetics Research Symposium
SP - 1536
EP - 1539
BT - Progress in Electromagnetics Research Symposium 2009, PIERS 2009 Beijing
PB - Electromagnetics Academy
T2 - Progress in Electromagnetics Research Symposium 2009, PIERS 2009 Beijing
Y2 - 23 March 2009 through 27 March 2009
ER -