RFID 2013 talk-eve
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Transcript of RFID 2013 talk-eve
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1
A Battery-free RFID-based indoor acoustic localization platformYI ZHAO (EVE), JOSHUA SMITH
SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
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2SENSOR SYSTEMS LAB,
UNIVERSITY OF WASHINGTON
Outlineo Introduction
• Application• Challenge• Motivation
o Acoustic RFID localization• System Architecture• Localization method• Performance• Future work
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3SENSOR SYSTEMS LAB,
UNIVERSITY OF WASHINGTON
Motivation & In-door Application
Navigation Assistance Robot Auto-manipulation
Object Tracking & Inventory
Activity Awareness & Logging
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4
Small systemcompatible
Life-timeSize
Efficiency
SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
Ideal System
Low cost
Low power
High performance Accuracy LatencyRange
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5SENSOR SYSTEMS LAB,
UNIVERSITY OF WASHINGTON
Small & low cost System
Acoustic systemo Acoustic Time of Arrival
(ToA) or Acoustic Angle of Arrival (AoA)
o Triangulation
RFID systemo RF Received Signal
Strength Indication (RSSI)o Proximity
Cricket LANDMARC
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6SENSOR SYSTEMS LAB,
UNIVERSITY OF WASHINGTON
Pros & Cons
Acoustic system V.S. RFID system Accurate (cm) Inexpensive× New infrastructure × life-time × Size× External Synchronization
Ultra-low power Low cost Size RFID infrastructure × RF multi-path× Low accuracy (m)× Multitude tags or readers
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3 ToA
Acoustic transmitter
SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
Localization method
Acoustic system RFID system
TriangulationPosition
3 object –transmitter distance
distance
EPC Gen2 RFID system
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8SENSOR SYSTEMS LAB,
UNIVERSITY OF WASHINGTON
Idea
Acoustic system RFID system
Low cost tagsEPC Gen2 RFID compatibleLife-time Size Accuracy
? Other Performance? Synchronization
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9SENSOR SYSTEMS LAB,
UNIVERSITY OF WASHINGTON
Outlineo Introduction
• Application• Challenge• Motivation
o Acoustic RFID localization• System Architecture• Localization method• Performance• Future work
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10SENSOR SYSTEMS LAB,
UNIVERSITY OF WASHINGTON
Acoustic RFID-based Localization
WISP Rx
Reader
• UHF Gen2 RFID tag• Programmable• Extendable for sensing
WISP Tx WISP tag Ultrasonic transmitters (Tx)
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11SENSOR SYSTEMS LAB, UNIVERSITY OF
WASHINGTON
System Architecture
WISP Tx
WISP Rx
Reader
Active WISP Ultrasonic transmitters (Tx)
Passive WISP Tone detector (Rx)
Antenna UHF Gen2 Reader
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SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
12
Location method
Reader
WISP Tx
WISP Rx
RF Command & Power
Spy RF Command
25kHz Ultrasound
WISP Rx
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SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
13
ToAs measurement
Ultra-sonic emotion
EPC
EPC
(ToAs)
DetectToAs
Reader
Reader
time
WISP Tx
WISP Tx
WISP Rx
WISP RxACK + RN16
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16%
84%
Acoustic: 119 (µJ)RFID: 622 (µJ)
SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
14
Performance Energy
Cost
PrecisionLatency
Reader WISP Rx2.2m
Mean 0.7s
Max 1.5 cm
Max 731uJ/ sample
RF Multi-path
RFPower
WISP Tx
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SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
15
Experiment and Performance
Reader WISP Tx
x (cm)
Color bar: Latency (s) Size: Precision
Ultrasound Transmission: 102dB SPLMin. detectable SPL for WISP Rx: 71.59dB SPL (x = 5m)
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16%
84%
Acoustic: 119 (µJ)RFID: 622 (µJ)
SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
16
Conclusion Energy
Cost
PrecisionLatency
Reader WISP Rx2.2m
Mean 0.7s
Max 1.5 cm
Max 731uJ/ sample
RF Multi-path
RFPower
WISP Tx
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17SENSOR SYSTEMS LAB,
UNIVERSITY OF WASHINGTON
Future Work Analog-backsatter
see “Hybrid Analog-Digital Backscatter: A New Approach for Battery-Free Sensing” Vamsi Talla and Joshua R. Smith)
PerformanceAntenna Data processing & localization
algorithm Size Activity recognition
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18
Questions ?
SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON
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19
Thank you !
SENSOR SYSTEMS LAB, UNIVERSITY OF WASHINGTON