Short-time Fourier transform of deeply located tunnel signatures measured by cross-borehole radar
- Short-time Fourier transform of deeply located tunnel signatures measured by cross-borehole radar
- 김상욱; 김세윤; 남상욱
- tunnel; short-time Fourier transform; borehole radar; Air cavity; cross-hole radar; pulse radar; underground tunnel
- Issue Date
- IEEE geoscience and remote sensing letters : a publication of the IEEE Geoscience and Remote Sensing Society
- VOL 8, NO 3, 493-496
- The cross-borehole pulse radar signatures of a deeply located
dormant tunnel were measured in a well-suited tunnel test site
in Korea. The relatively fast arrival of the first peak at depth in
the empty tunnel was enhanced by applying STFT to the radar
data. We clearly showed that the TOP patterns of the STFT
components at 40 and 50 MHz are faster and more distinctive
than that of the raw data.
The time acceleration of 10–13 ns due to the air-filled tunnel
is somewhat small in comparison with the variation of the
first arrival time due to the inhomogeneous property of the
surrounding rock. In our approach, the first arrival time was
amplified in the tunnel region using the property of zooming
in the STFT method. It is accomplished by eliminating not
only the lower frequency components containing no tunnel
signature but also the higher frequency components attenuating
significantly below noise level. We believe that the bandpass
filtering property of the STFT scheme would be very effective
tool for detecting the tunnel in highly inhomogeneous rock.
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