Upload
abigayle-mills
View
214
Download
0
Embed Size (px)
Citation preview
Wireless Localization Wireless Localization System Using System Using
Propagation TimingPropagation Timing
Brian DakeBrian Dake
Brian VaughanBrian Vaughan
Sean BrennanSean Brennan
BasicsBasics
Localization using propagation timingLocalization using propagation timing Location tracked in real timeLocation tracked in real time Can be used to control servos for Can be used to control servos for
trackingtracking Spotlights, cameras, laser pointer, etcSpotlights, cameras, laser pointer, etc
FunctionFunction
1 mobile mote1 mobile mote 3 stationary motes3 stationary motes Mote communication established Mote communication established
through radio frequenciesthrough radio frequencies Localization calculated using Localization calculated using
propagation delay of ultrasound wavepropagation delay of ultrasound wave Servo motors follow the mobile mote Servo motors follow the mobile mote
in real timein real time
DesignDesign
Motes from CrossbowMotes from Crossbow
DesignDesign
Ultrasound TX/RX added to motesUltrasound TX/RX added to motes Mobile mote incorporates ultrasound Mobile mote incorporates ultrasound
TXTX Stationary mote incorporates Stationary mote incorporates
ultrasound RXultrasound RX TinyOS from Berkeley available TinyOS from Berkeley available
online to program motesonline to program motes
ImplementationImplementation
Mobile mote sends out radio and Mobile mote sends out radio and ultrasound signals at the same timeultrasound signals at the same time
Mobile MoteStationary Mote
ImplementationImplementation
Stationary mote measures time Stationary mote measures time difference between radio and ultrasound difference between radio and ultrasound pulsepulse
Distance is calculatedDistance is calculated Position is found using multiple Position is found using multiple
stationary motesstationary motes Instructions given to servos for Instructions given to servos for
movement based on real time positionmovement based on real time position
ProblemsProblems
Integrating ultrasound devicesIntegrating ultrasound devices– We can build our own motes using We can build our own motes using
circuit diagrams from the MIT Cricket circuit diagrams from the MIT Cricket projectproject
– Just use radio strength data (less Just use radio strength data (less accurate)accurate)
Time delay in processing locationTime delay in processing location Might be easier to implement using Might be easier to implement using
UHF RFID RadarUHF RFID Radar
Mini-ProjectMini-Project
Implement the mote system using Implement the mote system using two motestwo motes
Ultrasound and radio communication Ultrasound and radio communication workingworking
Questions?Questions?