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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

……………

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

…………..

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