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  • Proceeding
    MobiCom ‘00 Proceedings of the 6th annual international conference on Mobile computing and networking

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SynopsisPermalink

Combination of RF and ultrasound to enable a listener to determine the distance to beacons.

LocalizationPermalink

Speed of signalsPermalink

  Denote speed of Approximate value in air (m/ms)
vs ultrasound 0.34
vr RF 299700

Distance measurementPermalink

Distance between beacon and listener d=vrvsΔtvrvsvsΔt, where Δt is the time difference between the receipt of RF signal and ultrasonic signal.

FeaturesPermalink

  • Decentralized, and
  • User privacy preserved, a listener is completely passive.

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