WiFi direction finding.

[Ted Ozolins]

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.

-- 
Ted Ozolins(VE7TVO)
Westbank, B. C