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Project Presentation: SpinLoc

SpinLoc system utilizes spinning beacons and Doppler frequency shift for stationary targets with 40-50 cm median error. SpinTrack integrates SpinLoc and dTrack for moving targets, enhancing scalability and energy-efficiency. Scheduling forms infrastructure subgroups targeting unique objects for centralized control and global schedules.

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Project Presentation: SpinLoc

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  1. Project Presentation: SpinLoc Ted 2008/6/20

  2. A quick review • SpinLoc: a indoor localization system • Utilize spinning beacons and Doppler frequency shift to localize stationary target • Experimental result: • median error of 40~50 cm • 90% error of 70~90 centimeters.

  3. video demo

  4. Improvement • To target moving and stationary object simultaneously

  5. Proposed Solution: SpinTrack • Integrate two system • SpinLoc (for stationary targets) • dTrack (for moving targets) dTrack: Tracking mobile nodes using RF Doppler shifts, SenSys ’07

  6. SpinTrack • Basic idea: reverse the sender-receiver deployment in SpinLoc plus some stationary infrastructure nodes • Advantage • Can switch the SpinLoc and dTrack without extra overhead

  7. SpinTrack

  8. Another improvement • Scalability • Note that SpinTrack can only target one object per round

  9. Proposed Solution: Scheduling • Basic idea: to form the infrastructure nodes into subgroups • Each subgroup target one unique object G1 G2 G1 G1: group 1 G2: group 2 O1: object 1 O2: object 2 O1 O2 G2 G1 G2

  10. A possible solution • Slotted time division schemes scheduler time

  11. Requirement • Centralized control • Global schedules • Fine-grain time synchronization

  12. Another advantage from scheduling • Energy-efficiency • Simply make the node into idle mode when not functioning

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