The Cricket Location-Support System (2000)
Published inPermalink
- Proceeding
MobiCom ‘00 Proceedings of the 6th annual international conference on Mobile computing and networking
Online copiesPermalink
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=vrvsΔtvr−vs≈vsΔt, 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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