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SixthSence:RFID-based Enterprise Intelligence
HELEN
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OutlineRFID EquipmentRFID PERFORMANCE MEASUREMENTAlgorithmsEvaluationApplication
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RFID EquipmentThe Impinj UHF Gen 2 Speedway Reader
Impinj's Monza RFID tag
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RFID PERFORMANCE MEASUREMENT
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Effect of displacement from antenna axis on read rangeTag move away from the antenna axis the
read range decreases
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Effect of distance from antenna on allowed displacement from axisThe tag moves farther from antenna , the
allowed displacement from axis also increases proportionally
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Read range for tags on object carried by a person
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AlgorithmsPerson-object differentiationObject ownershipZone identificationPerson identification
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Tag belong to person or object?Object move only when carried by a person
transition=?Define a suitable threshold person
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Problem?An object belong to an active person might
well exhibit far more movement than a sedentary
>
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Co-movementThe movement of a tag is compare with the
movement of other tags at the same point
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tag1
Tag0
tag2
tag1m1
=1 C1=1
Tag2,m2=2,C2=2
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Object ownership
borrow
confuse
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Co-presenceFor each object , we simply keep track of the
amount time .
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Zone identificationIndividual workspaceShared workspaceReserved shared workspaceCommon area
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Person identificationLogging Tag id of person person
identity 1
1
1
1
2
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Object interactionIf environment is stable , the RSSI from the
tag would also be stableIf object is picked up , this would change its
distance and its orientation ,thereby causing the RSSI of its tag change
Differ at least 10 dBm interacted
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Evaluation movement detection
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100
tag
tag
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Object interaction detectionSample every 200 ms4 second window 20 samples 6-7
times antenna
antenna
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Stability
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Test bed deployment
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1 2 3 …………… 20
x 20 10% go x 4 (pick at random)
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Movement with walk length of 10
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Movement with walk length of 2
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ApplicationMisplaced object alertAnnotated videoAutomatic conference room bookingSemi-automated image catalog