Difference between revisions of "Why use Bluetooth for contact tracing? (Q4560)"
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Latest revision as of 11:47, 13 May 2020
blogpost published on April 17,2020
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Why use Bluetooth for contact tracing?
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blogpost published on April 17,2020
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Statements
17 April 2020
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The RSSI also vary wildly depending on: |Sending device model Receiving device model | The geometry of the building |The location of the devices within the building | Number of people nearby | Whether the device is in the pocket or held in hand | The direction the person with the phone is facing |The signals bleed through floors — probably unlike the virus.
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RSSI biases caused by both the sending and receiving device have to be calibrated out. When working with iBeacons, we have noticed that, even if the sending device is the same (a fixed iBeacon), different devices observe very different RSSI patterns. Differences of 20 dBm (= 100x signal strength difference) are not unusual.
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