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Time-frequency spectral responses of an in-house built step-frequency continuous wave (SFCW) GPR (Y akumo) developed by Tohoku University and a commercial impulse GPR were studied and compared. The Yakumo SFCW GPR operates from 50 MHz to 1.5 GHz, and the center frequency of the commercial impulse GPR is 500 MHz. Both GPRs were probed on top of an embedded steel pipe overlaid by a concrete pavement...
Spectral shift and absorption of dispersed GPR signals corresponding to a downward wetting front in a sand column simulated in laboratory were studied. The non-stationary GPR signals (making use of a 1000MHz antenna) were processed with short time-fourier transform (Lai et al. 2012) and wavelet transform (WT) in a time-frequency domain. Distributions of peak frequency, bandwidth and associated spectral...
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