Method and apparatus for obtaining sectional information of the underground by measuring time differences and strength of electromagnetic signals
US5323114A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1992 |
| Grant date | Jun 21, 1994 |
| Priority date | — |
| Expiry date | Mar 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01V3/30
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An underground radar tomography in which an electromagnetic wave is radiated into the ground, the amplitude and propagation time of a transmitted wave, a reflected wave or a diffracted wave of the electromagnetic wave are measured at a number of points, and signal processing is performed on the result of measurement to thereby obtain the distribution of strata and soil in the ground as section information with a high accuracy. By use of two pseudo random signals which are slightly different in period but the same in code pattern, measurement time which is expanded relative to propagation time is obtained to thereby make the measurement accuracy high.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.