Deep look electromagnetic detection and imaging transceiver (EDIT) system for detecting underground passageways
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United States of America Patent
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Apr 16, 2013
Grant Date -
Dec 15, 2011
app pub date -
Jun 15, 2010
filing date -
Jun 15, 2010
priority date (Note) -
Expired
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Abstract
An underground tunnel detection system does not employ radar. Instead, an automatic frequency control is used to keep a continuous wave (CW) transmission tuned to the resonant frequency of a resonant microwave patch antenna (RMPA). Changes in loading and the bulk dielectric constant of the mixed media in front of the RMPA will affect its resonant frequency and input impedance. A significant shift in the measured input impedance is interpreted as a possible tunnel, and the phase angle of the measured input impedance tends to indicate a slightly forward or aft position relative to the detection system rolling over it on the ground surface.
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