Advanced System for Navigating Between, Locating and Monitoring Underground Assets
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United States of America Patent
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Issued Date -
Sep 3, 2015
app pub date -
Mar 3, 2015
filing date -
Mar 3, 2014
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Abstract
A marker for underground assets employs a long life battery to provide an active mode for recording data from a sensor or the like and/or for boosting transmissions after being activated by an interrogation signal, the long life battery greatly increasing the range of such underground markers. In some embodiments, the marker antenna may be automatically tuned for different environmental conditions of the underground marker. A field unit for locating the marker may provide for dead reckoning ability in the absence of reliable radio location.
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