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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The Cricket Location-Support System

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The cricket location support system

The Cricket Location-Support System

By: Min Chen

10/28/03


The cricket location support system

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


System parameters selection

use a relatively sluggish RF data transmission rate.

System Parameters Selection


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.


Implementation beacon positioning and configuration

Implementation :Beacon Positioning and Configuration


Implementation ultrasound deployment

Implementation :Ultrasound Deployment


Experiment boundary performance

Experiment: Boundary Performance


Experiment static performance

Experiment: Static Performance


The cricket location support system

Experiment: Static Performance (Cont)


Experiment mobile performance

Experiment: Mobile Performance


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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