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jarkko-hautakorpi / iBeacon-indoor-positioning-demo

Indoor positioning of iBeacon tags (tagged people, dogs, cats and objects) by trilateration, using ESP32.
MIT License
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Trilateration Concept in BLE Indoor Positioning System #13

Closed Mahamutha closed 5 years ago

Mahamutha commented 5 years ago

Hi,

Consider I have three BLE gateways/stations which receives the RSSI value from the BLE Tag/Beacon. The BLE tag would have sent RSSI value to all the three gateways say for ex,

BLE Tag1 to Gateway1 = -45 BLE Tag1 to Gateway2 = -56 BLE Tag1 to Gateway3 = -61

I have coordinate for all the three gateways like,

Gateway1 = 10,10 Gateway2 = 100,10 Gateway3 = 10,100

Now How to convert the RSSI values as distance in order to proceed with the trilateration technique?

jarkko-hautakorpi commented 5 years ago

Here https://github.com/jarkko-hautakorpi/iBeacon-indoor-positioning-demo/blob/10a22d9427e63cdf199e63d87789e0770ee3ac6c/dashboard/src/Positioner/PositionCalculator.js#L15

And please see the Trilat -library for position calculation in X,Y coordinates https://www.npmjs.com/package/trilat