Apparatus and method for determining the propagation velocity of an electromagnetic signal in a subsurface medium utilizing ground penetrating radar
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United States of America Patent
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Issued Date -
Jan 24, 2002
app pub date -
Jul 18, 2001
filing date -
Jul 21, 2000
priority date (Note) -
Abandoned
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Abstract
The present invention provides an apparatus and method for determining the propagation velocity of an electromagnetic signal in a subsurface medium which can then be utilized as a parameter in the calculations of various properties of a subsurface medium, including thickness, compaction and water content variation, and subsurface target depth. Propagation velocity is obtained by taking measurements in free space, resulting in air-launched waveforms, and at the medium surface, known as surface-coupled waveforms. The air-launched waveforms are subtracted from the surface-coupled waveforms resulting in a surface-coupled residual waveform. Comparison of the residual waveform amplitude to a calibrated amplitude scale obtained from measurements of media with known propagation velocities results in a velocity measurement comparable in regards to accuracy to a measurement obtained using the prior art.
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