Active Bat: A 3D Location Device
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Transcript of Active Bat: A 3D Location Device
ActiveBat:1WirelessNet
Tseng
Active Bat: A 3D Location Device
http://www.uk.research.att.com/bat/
-- presented by Yu-Chee Tseng --
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Goal
Low-power wireless inexpensive fine-grain 3D positioning sensor
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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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Hardware
prototype of ultrasonic transmitter:5.5cm x 3cm x 2.4cm30 g3-month life timea unique 16-bit address
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Receivers
mounted on the walleach 1.2 m apartnetworked to a PC
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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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Applications
Sentient computing systemAT&T Lab, Cambridge.Personnel carry wireless devices – Bats.Sensors locates on the ceiling.Functions
Spatial monitor (for browsing on the Web)Follow-me systemsData creation, storage, and retrieval
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Applications
1. trigger2. emit signals3. positioning by TOA
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Applications