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Active Bat: A 3D Location Device

Active Bat: A 3D Location Device. http://www.uk.research.att.com/bat/ -- presented by Yu-Chee Tseng --. Goal. Low-power wireless inexpensive fine-grain 3D positioning sensor. medium: ultrasonic method: triangulation an emitter is attached to an object receivers are mounted on the wall

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Active Bat: A 3D Location Device

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  1. Active Bat: A 3D Location Device http://www.uk.research.att.com/bat/ -- presented by Yu-Chee Tseng --

  2. Goal • Low-power • wireless • inexpensive • fine-grain 3D positioning sensor

  3. 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 Theory

  4. Hardware • prototype of ultrasonic transmitter: • 5.5cm x 3cm x 2.4cm • 30 g • 3-month life time • a unique 16-bit address

  5. Receivers • mounted on the wall • each 1.2 m apart • networked to a PC

  6. Results • accuracy = 10 cm (in each of the 3 dimensions) • can find 25 objects per second • Watch demo “active-bat.mpg” (from ORL).

  7. 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

  8. Applications 1. trigger 2. emit signals 3. positioning by TOA

  9. Applications

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