What Am I Looking At? Low Power Radio-Optical Beacons For In-View - - PowerPoint PPT Presentation

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What Am I Looking At? Low Power Radio-Optical Beacons For In-View - - PowerPoint PPT Presentation

May 16, 2023 166 likes •364 views

What Am I Looking At? Low Power Radio-Optical Beacons For In-View Recognition Ashwin Ashok aashok@winlab.rutgers.edu with Chenren Xu, Tam Vu, Wenjia Yuan, Richard Howard, Marco Gruteser, Kristin Dana, Narayan Mandayam WINLAB IAB, 15 th May

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SLIDE 1

What Am I Looking At? Low Power Radio-Optical Beacons For In-View Recognition

Ashwin Ashok aashok@winlab.rutgers.edu with Chenren Xu, Tam Vu, Wenjia Yuan, Richard Howard, Marco Gruteser, Kristin Dana, Narayan Mandayam WINLAB IAB, 15th May 2014

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The In-View Recognition “Problem”

What is it? Where is it?

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Towards augmented reality

ActiveBat system (Ultrasound) ARTags ( fiducial markers) Google GLASS

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SLIDE 4

What technology is best?

Use the best of both worlds!

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SLIDE 5

Low Power Radio-Optical Beacons

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Mechanism

High intensity IR strobe Extremely short duration Synchronized using RF channel ID using RF

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Rethinking IR transmitter design

Distance Range Energy Consumption IrDA GigaIR Our goal Remote control

existing IR technologies

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Leveraging directionality in receiver for AoA

Small size/wearable Sample IR pulse at micro-sec resolution

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SLIDE 9

Prototype

9

Radio (380 us) IR light beacon (10 us) Duty-cycling period 1s SLEEP Sampling the Noise TX RX (Always ON)

Angular range : +/-20deg Distance range : 3-10m (depends on IR pulse length)

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SLIDE 10

Evaluation scenarios

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Setup and Metrics

Recognition Accuracy angle of arrival (horizontal, vertical) distance (along direction of view) Energy consumption

  • scilloscope measurements of battery current draw
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Accuracy : angle

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Accuracy : distance

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Battery energy consumption (TX)

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SLIDE 15

Tradeoff

Average

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Towards improved designs

Protocol design: Transmit only when the receiver is in-view Hardware design: Increase angular range : 150deg

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Summary

  • Infrared link for precise orientation and distance estimation
  • Low power communication & synchronization using radio link
  • Prototype:

– Angular accuracy within 1.5 deg on the horizontal and vertical, range upto 9m – very low battery power consumption, supporting tag battery life

  • f the order of years.
  • Caters to many venues of research: augmented reality,

localization, energy optimization

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SLIDE 18

Questions?

Contact: aashok@winlab.rutgers.edu http://winlab.rutgers.edu/~aashok/