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Wireless Localization System Using Propagation Timing

Wireless Localization System Using Propagation Timing. Brian Dake Brian Vaughan Sean Brennan. Basics. Localization using propagation timing Location tracked in real time Can be used to control servos for tracking Spotlights, cameras, laser pointer, etc. Function. 1 mobile mote

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Wireless Localization System Using Propagation Timing

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  1. Wireless Localization System Using Propagation Timing Brian Dake Brian Vaughan Sean Brennan

  2. Basics • Localization using propagation timing • Location tracked in real time • Can be used to control servos for tracking • Spotlights, cameras, laser pointer, etc

  3. Function • 1 mobile mote • 3 stationary motes • Mote communication established through radio frequencies • Localization calculated using propagation delay of ultrasound wave • Servo motors follow the mobile mote in real time

  4. Design • Motes from Crossbow

  5. Design • Ultrasound TX/RX added to motes • Mobile mote incorporates ultrasound TX • Stationary mote incorporates ultrasound RX • TinyOS from Berkeley available online to program motes

  6. Implementation • Mobile mote sends out radio and ultrasound signals at the same time MobileMote Stationary Mote

  7. Implementation • Stationary mote measures time difference between radio and ultrasound pulse • Distance is calculated • Position is found using multiple stationary motes • Instructions given to servos for movement based on real time position

  8. Problems • Integrating ultrasound devices • We can build our own motes using circuit diagrams from the MIT Cricket project • Just use radio strength data (less accurate) • Time delay in processing location • Might be easier to implement using UHF RFID Radar

  9. Mini-Project • Implement the mote system using two motes • Ultrasound and radio communication working

  10. Questions?

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