Three dimensional RF signatures
First Claim
1. A method of detecting tampering of a physical article, the method comprising:
- receiving, at a first point in time, at least two response signals from at least one Radio Frequency (RF) tag in a set of RF tags on the physical article, wherein the at least two response signals include an RF tag code and an indication of an electrical characteristic of the at least one RF tag;
forming a first response RF signature for the physical article based on the RF tag code and the indication of the electrical characteristic of the at least one RF tag;
receiving a second response signal from at least one other RF tag in the set of RF tags on the physical article at a second point in time;
forming a second response RF signature for the physical article based on the received second response signal;
assessing a relative spacing between the at least one RF tag and the at least one other RF tag on the physical article has changed from the first point in time to the second point in time based on a comparison between the first and second response RF signatures; and
determining tampering of the physical article as a result of the relative spacing assessment.
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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.
19 Citations
20 Claims
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1. A method of detecting tampering of a physical article, the method comprising:
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receiving, at a first point in time, at least two response signals from at least one Radio Frequency (RF) tag in a set of RF tags on the physical article, wherein the at least two response signals include an RF tag code and an indication of an electrical characteristic of the at least one RF tag; forming a first response RF signature for the physical article based on the RF tag code and the indication of the electrical characteristic of the at least one RF tag; receiving a second response signal from at least one other RF tag in the set of RF tags on the physical article at a second point in time; forming a second response RF signature for the physical article based on the received second response signal; assessing a relative spacing between the at least one RF tag and the at least one other RF tag on the physical article has changed from the first point in time to the second point in time based on a comparison between the first and second response RF signatures; and determining tampering of the physical article as a result of the relative spacing assessment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A Radio Frequency (RF) tag system, comprising:
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at least two RF tags, wherein at least one RF tag of the at least two RF tags comprises; at least two non-coplanar power coils; and a circuit connected to the at least two non-coplanar power coils, the circuit configured to detect at least one electrical characteristic from at least two of the non-coplanar power coils; a RF tag reader configured to; receive, at a first point in time, at least two response signals from the at least one RF tag, wherein the at least two response signals include an RF tag code and an indication of the detected at least one electrical characteristic from the circuit; form a first RF signature for a physical article based on the received RF tag code and indication of the detected at least one electrical characteristic; receive a second response signal from at least one other RF tag of the at least two RF tags on the physical article at a second point in time; form a second RF signature for the physical article based on the received second response signal; assess a relative spacing between the at least one RF tag and the at least one other RF tag on the physical article has changed from the first point in time to the second point in time based on a comparison between the first and second RF signatures; and determine tampering of the physical article as a result of the relative spacing assessment. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification