A Novel Approach of High Resolution Imaging using Modified Excitation Signal for Ground Penetration Radar (GPR) Applications
Keywords:
Finite Difference Time Domain (FDTD), Gaussian Pulse, Ground Penetrating Radar (GPR), Pulse Shape Modulation (PSM)Abstract
In this paper a modified Gaussian pulse stimulus is employed to improve the accuracy of underground pipe localizing for 2D visualization of GPR results. This pulse shaping puts more energy at higher frequencies in contrast with conventional Gaussian in GPR. Hence, a wider bandwidth is available to achieve higher accuracy for precise spatial localization. Two dimensional simulations of GPR profiles over ground surface with and without conduits run with the finitedifference time-domain (FDTD) program GPRMAX are presented to validate the accuracy of the proposed method. Results from these surveys showed decent structural recovery of a small pipe similar in structure to that of the modeled ones. Finally, the dense surveys served as a benchmark to compare interpretations taken with the same surveys at lower spatial resolutions and profiles with 2D-only processing methods in order to understand errors in analysis and interpretation that are possible from 2D surveys.
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