Three dimensional RF signatures
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United States of America Patent
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Apr 21, 2015
Grant Date -
Apr 11, 2013
app pub date -
Nov 13, 2012
filing date -
Sep 22, 2006
priority date (Note) -
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Abstract
Method and systems to detect tampering in a physical article are described herein. A method includes receiving, at a first point in time, at least two response signals from at least one RF tag in a set of RF tags associated with the physical article; forming a first response signature for the physical article based on the received response signals; receiving a second response signal from at least one other RF tag in the set of RF tags associated with the physical article at a second point in time; assessing a relative spacing between the RF tags associated with the physical article has changed from the first point in time to the second point in time; and determining tampering of the physical article as a result of the spacing assessment.
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