the cricket location support system
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The Cricket Location-Support System. By: Min Chen 10/28/03 . Goal. User Privacy Decentralized administration Network heterogeneity Low cost Room-sized granularity. System Architecture. Beacon: Disseminate the string of space information about a geographic space to listeners.

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Presentation Transcript
slide2
Goal
  • User Privacy
  • Decentralized administration
  • Network heterogeneity
  • Low cost
  • Room-sized granularity
system architecture
System Architecture
  • Beacon:

Disseminate the string of space information about a geographic space to listeners.

  • Listener: Infer its current location from the set of beacons .

Approach

Use combination of RF and ultrasound to provide a location-support service to users.

related problem and method
Related Problem and Method
  • Collision of RF transmissions from different beacons

------------Randomization

  • Wrong correlation of the RF data of one beacon with the ultrasonic signal of another

------ System parameters

------ Listener Inference Algorithms

interference scenarios
Interference Scenarios
  • RF-A:US-RA
    • Align the beacons
  • RF-A:US-I
    • Using RF signal with long range
  • RF-A:US-RI
    • Ensure less than 5 beacons within range of each other
listener inference algorithm
Listener Inference Algorithm
  • Majority
    • Picks the beacon with highest frequency of occurrence
  • MinMean
    • Selects the beacon with the minimum mean value
  • MinMode
    • Compute the per-beacon statistical mode over the past n samples.
comments
Comments

Concerns when apply to sensor network

2D Constrain

Power Consideration

Calibration On the Transmitter.

Kalman Filter for the Mobile Algorithm

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