Project%20Presentation:%20SpinLoc

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Project Presentation SpinLoc

• Ted
• 2008/6/20

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A quick review

• SpinLoc a indoor localization system
• Utilize spinning beacons and Doppler frequency
  shift to localize stationary target
• Experimental result
• median error of 4050 cm
• 90 error of 7090 centimeters.

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• video demo

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Improvement

• To target moving and stationary object
  simultaneously

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Proposed Solution SpinTrack

• Integrate two system
• SpinLoc (for stationary targets)
• dTrack (for moving targets)
• dTrack Tracking mobile nodes using RF Doppler
  shifts, SenSys 07

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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

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SpinTrack
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Another improvement

• Scalability
• Note that SpinTrack can only target one object
  per round

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Proposed Solution Scheduling

• Basic idea to form the infrastructure nodes
  into subgroups
• Each subgroup target one unique object

G1
G1
G2
G1 group 1 G2 group 2 O1 object 1 O2 object 2
O1
O2
G2
G1
G2
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A possible solution

• Slotted time division schemes

Object x Object y Object x Object z Etc
scheduler
time
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Requirement

• Centralized control
• Global schedules
• Fine-grain time synchronization

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Another advantage from scheduling

• Energy-efficiency
• Simply make the node into idle mode when not
  functioning