Active virtual fence using mesh networked RF tags
First Claim
1. A system capable of monitoring an area and detecting a disturbance with the area, the system comprising radio frequency tags, each of the tags communicating with one or more neighboring ones of the tags, at least a first one of the tags including a first digital signal processing module configured to monitor changes in radio frequency multipath properties of received packets transmitted by at least a second one of the tags, the second one of the tags including a second digital signal processing module configured to monitor changes in radio frequency multipath properties of received packets transmitted by at least a third one of the tags, the changes being caused by a disturbance indicative of an object in a vicinity of the tags.
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Accused Products
Abstract
A system capable of monitoring an area and detecting a disturbance with the area. The system has a plurality of ultra-wide band radio frequency tags, each of the tags including a digital signal processing module configured to monitor changes in radio frequency multipath properties of received packets transmitted by at least one other of the tags. Changes in the radio frequency multipath properties may be caused by a disturbance indicative of an object in the vicinity of the tags. A corresponding method is also disclosed.
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Citations
16 Claims
- 1. A system capable of monitoring an area and detecting a disturbance with the area, the system comprising radio frequency tags, each of the tags communicating with one or more neighboring ones of the tags, at least a first one of the tags including a first digital signal processing module configured to monitor changes in radio frequency multipath properties of received packets transmitted by at least a second one of the tags, the second one of the tags including a second digital signal processing module configured to monitor changes in radio frequency multipath properties of received packets transmitted by at least a third one of the tags, the changes being caused by a disturbance indicative of an object in a vicinity of the tags.
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6. A method for detecting entry of an object into a monitored area, the method comprising:
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deploying radio frequency tags, each of the tags communicating with one or more neighboring ones of the tags and at least a first one of the tags including a first digital signal processing module configured to monitor changes in radio frequency multipath properties; monitoring, by the first one of the tags, radio frequency multipath properties of received packets transmitted by at least a second one of the tags, the second one of the tags including a second digital signal processing module configured to monitor changes in radio frequency multipath properties of received packets transmitted by at least a third one of the tags; and determining if any changes in the radio frequency multipath properties have occurred. - View Dependent Claims (7, 8, 9, 10, 12, 14, 16)
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Specification