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ActiveBat:1 WirelessNet Tseng Active Bat: A 3D Location Device http://www.uk.research.att.com/bat/ -- presented by Yu-Chee Tseng --
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ActiveBat:2 WirelessNet Tseng Goal Low-power wireless inexpensive fine-grain 3D positioning sensor
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ActiveBat:3 WirelessNet Tseng Theory medium: ultrasonic method: triangulation an emitter is attached to an object receivers are mounted on the wall we measure the times-of-flight of the pulse to the receivers the speed of sound is known given 3 or more distances, we can determine the 3D location of the object by keeping track of the 3D locations, we can determine the orientation and speed of the object
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ActiveBat:4 WirelessNet Tseng Hardware prototype of ultrasonic transmitter: 5.5cm x 3cm x 2.4cm 30 g 3-month life time a unique 16-bit address
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ActiveBat:5 WirelessNet Tseng Receivers mounted on the wall each 1.2 m apart networked to a PC
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ActiveBat:6 WirelessNet Tseng Results accuracy = 10 cm (in each of the 3 dimensions) can find 25 objects per second Watch demo “active-bat.mpg” (from ORL).
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ActiveBat:7 WirelessNet Tseng Applications Sentient computing system AT&T Lab, Cambridge. Personnel carry wireless devices – Bats. Sensors locates on the ceiling. Functions Spatial monitor (for browsing on the Web) Follow-me systems Data creation, storage, and retrieval
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ActiveBat:8 WirelessNet Tseng Applications 1. trigger 2. emit signals 3. positioning by TOA
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ActiveBat:9 WirelessNet Tseng Applications
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