WiFi direction finding.

[Net Llama!]

On Fri, 26 Dec 2003, Ted Ozolins wrote:
> Jeeves Moseley wrote:
>
> > I've got a idea.  I've got the hardware stuff down to a fine art, but
> > I have no idea on how to do the software.  if you use 3 cell phone
> > antennas formed in a triangle and took the signal strength from all 3,
> > you'd be able to use that information to effectively find the incoming
> > direction of the WiFi signal.  if you wanted to take it a step
> > further, then you could make the transitions transmit in phase and
> > extend the distance of the system with out boosting the power.
> > Adversely you could also use the third antenna to create a virtual
> > ground plane behind the two receiving antennas to boost their
> > receiving power.  If you know of any talented Windows programmers who
> > are interested in trying this, please let me know.  I'm willing to do
> > the hardware mods, etc, but as I said, I have no idea on the
> > software.  Thanks again.
> >
> > Scott
> >
> >
> >------------------------------------------------------------------------
> >
> Why would you need software? Sampling the signals obtained by switching
> the antennae one at a time at a speed of about 1-10kHz, you could
> process and measure the dif using an analog meter. To give you relative
> direction use two antennae and by using three would give you relative
> field_strength and direction. Ham operators have been using this method
> for years.

Also, why do you need a windows programmer?

-- 
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Lonni J Friedman				netllama at linux-sxs.org
Linux Step-by-step & TyGeMo		     http://netllama.ipfox.com