Short-time Fourier transform of deeply located tunnel signatures measured by cross-borehole radar

Title
Short-time Fourier transform of deeply located tunnel signatures measured by cross-borehole radar
Authors
김상욱김세윤남상욱
Keywords
tunnel; short-time Fourier transform; borehole radar; Air cavity; cross-hole radar; pulse radar; underground tunnel
Issue Date
2011-05
Publisher
IEEE geoscience and remote sensing letters : a publication of the IEEE Geoscience and Remote Sensing Society
Citation
VOL 8, NO 3, 493-496
Abstract
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.
URI
http://pubs.kist.re.kr/handle/201004/39896
ISSN
1545-598X
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KIST Publication > Article
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