Is it possible to determine the distance to the Bluetooth device? or to Wi-Fi device?

Actually the question is, would it be more or less a reasonable accuracy (10-50cm) to determine the distance to the device connected via Bluetooth? For example to do this on my smartphone under Android.

And immediately the same question about Wi-Fi.
October 8th 19 at 03:43
4 answers
October 8th 19 at 03:45
Bluetooth: no. Here's proof:

Wifi: Yes, but with low accuracy.
October 8th 19 at 03:47
What a cunning
October 8th 19 at 03:49
Using only the power of a received radio signal, the accuracy of 0.1–0.5 m can not be obtained. Different ways of holding the phone in your hand, and then a user between devices is sufficient to substantially affect the received signal.

Graphs can be viewed here: "Accurate Extraction of Face-to-Face Proximity Using
Smartphones and Bluetooth
" [pdf]. With Wi-Fi will be about the same.

Alternatively, you can use sound signals. Microsoft Research Asia claim to have achieved centimeter accuracy ("BeepBeep: A High Accuracy Acoustic Ranging System using COTS Mobile Devices" [pdf]).
Thanks for the links, interesting! Sorry that things are not so simple. Although I'm interested in the distance to the meter, it might not be so bad with the dependence of signal on distance. - Cale.Lubowi commented on October 8th 19 at 03:52
October 8th 19 at 03:51
At that distance, what you want is impossible to measure distances on the signal level BT or Wi-Fi. The fact is that up to roughly 10 wavelengths(For 2.4 GHz this works out to somewhere around 1.25 m, if I counted correctly) — the Fresnel zone for the antenna. In the near zone the signal level is not proportional to the distance to the antenna, and dramatically change from minimum to maximum(in the case of the light it will look like the Fresnel fringes). So alas, the laws of physics are against you...
Sorry, confused wrote. The Fresnel zone and the near zone is the same. - Cale.Lubowi commented on October 8th 19 at 03:54
Thanks for the description, I didn't know about the Fresnel zone. Once in this area did not look... - breanne.Predovic21 commented on October 8th 19 at 03:57

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