Title :
Analysis of dispersion of pulse signals in underground tunnels using finite-difference time domain and short-time Fourier transform
Author :
Kim, Sang-Wook ; Kim, Se-Yun
Author_Institution :
R&D Div., Isung Eng. Co. Ltd., Siheung, South Korea
Abstract :
The dispersion of pulse signals of a cross borehole radar simulator for tunnel detection was analyzed using FDTD and STFT. Two simulation cases with extremely different dispersion properties were simulated by the FDTD method. In the two cases, the trace path between the transmitter and receiver penetrated an air-filled tunnel perpendicularly and obliquely, respectively. The recorded fields in the cross sectional plane during FDTD computation were decomposed into several frequency components by STFT. By analyzing the propagation behaviors of frequency components, the different dispersion characteristics according to the tunnel´s oblique angle variation are visually rendered in detail.
Keywords :
Fourier transforms; finite difference time-domain analysis; radar receivers; radar signal processing; radar transmitters; tunnels; cross borehole radar simulator; finite-difference time domain; pulse signals dispersion; receiver; short-time Fourier transform; trace path; transmitter; tunnel detection; underground tunnels; Computational modeling; Continuous wavelet transforms; Finite difference methods; Fourier transforms; Frequency; Optical fiber dispersion; Radar detection; Signal analysis; Time domain analysis; Wavelet transforms; Field distribution; Finite-difference time domain(FDTD); Short-time Fourier transform (STFT); Signal decomposition;
Conference_Titel :
Ground Penetrating Radar (GPR), 2010 13th International Conference on
Conference_Location :
Lecce
Print_ISBN :
978-1-4244-4604-9
Electronic_ISBN :
978-1-4244-4605-6
DOI :
10.1109/ICGPR.2010.5550216
