Abstract
A technique for discrimination of a desired wave from measured borehole radar signal by using a time-frequency distribution(TFD) is discussed. Field measurement with a broad-band directional borehole radar equipped with micro array antennas was carried out for precise measurement of subsurface cracks. A direct coupling between transmitting and receiving antennas, which forms modes of guided waves along a radar sonde in a water-filled borehole, was theoretically analyzed and the propagation constant was determined. A TFD by Choi-Williams method is applied to the measured signal, which is a superposition of the direct coupling and desired reflected waves. From this TFD, we identified the guided wave and could extract reflected waves from radar targets.
| Original language | English |
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| Pages (from-to) | 681-684 |
| Number of pages | 4 |
| Journal | IEEE International Symposium on Electromagnetic Compatibility |
| Publication status | Published - 1994 Dec 1 |
| Event | Proceedings of the 1994 International Symposium on Electromagnetic Compatibility - Miyagi, Jpn Duration: 1994 May 16 → 1994 May 20 |
ASJC Scopus subject areas
- Condensed Matter Physics
- Electrical and Electronic Engineering