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Fingerprint using WI-FI power signal

I am working on how to determine the distance with the strength of the WIFI signal,

from an article entitled "Indoor Positioning" using WIFI and the Trilateration method.

Well, how can I do this method? What is the meaning of the offline and online phase in this context? If anyone has a clearer document, you can share it with me, thanks :)

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After some research, I found a solution to my question if someone needs it. Regarding FingerPrinting:

Starting point - location display

  • We need to divide the location into grid points.
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: http://www.int-arch-photogramm-remote-sens-spatial-inf-sci.net/XXXVIII-4-C26/1/2012/isprsarchives-XXXVIII-4-C26-1-2012.pdf

http://digitalcommons.calpoly.edu/cgi/viewcontent.cgi?article=1007&context=cpesp

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Source: https://habr.com/ru/post/1527675/

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