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The Cricket Location-Support System

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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The Cricket Location-Support System

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  1. The Cricket Location-Support System By: Min Chen 10/28/03

  2. Goal • User Privacy • Decentralized administration • Network heterogeneity • Low cost • Room-sized granularity

  3. 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.

  4. 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

  5. use a relatively sluggish RF data transmission rate. System Parameters Selection

  6. 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

  7. 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.

  8. Implementation :Beacon Positioning and Configuration

  9. Implementation :Ultrasound Deployment

  10. Experiment: Boundary Performance

  11. Experiment: Static Performance

  12. Experiment: Static Performance (Cont)

  13. Experiment: Mobile Performance

  14. 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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