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Posted by:janbbeck
Subject:Determine distance to AP without GPS?
Date:15:53:31 07/07/2010

> > Hello!
> >
> > –°an I use kismet to determine distance to the AP without GPS? And how accurate it?
>
> "no" and "not very"
>
> If you don't know the tx characteristics (power and gain), even if you had an estimated loss (which is hard all on its own) you have nothing to compare your signal to.
>
> (The theory is if you know what power level they're speaking at, and you know the loss over distance, you can get some form of distance... but you don't know this, so you're boned.)
>
> -m

This is quite right. You can, however, triangulate the signal with a directional antenna. This is a manual process.

Antenna arrays (mimo with beam forming) can do the directionality in software, in principle. But I am quite sure this is not accessible via software.

If this functionality becomes commonly accessible, then automatic triangulation while driving should become available as well.


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