[clug] WiFi Direction Finder

Paul Wayper paulway at mabula.net
Fri May 6 07:51:55 GMT 2005

At 11:33 AM 6/05/2005, you wrote:
>So you will get a more accurate angle
>  by turning till the signals arrive simultaneously
>  and sighting down the perpendicular bisector.
>Probably easier to pick in hardware too.

That's a really good point, and probably explains why those people who 
radio track koalas in the bush use this kind of rig.

Question: if you wired one aerial on opposite phase to the other, and then 
fed that signal to the network card, wouldn't that give you packets that 
were only perpendicular the base line _and_ in one direction (because at 
anything else they'd interfere or cancel out)?

If you further set the card to give you the signal strength, you can use 
the thing like a geiger counter or beeper - as the signal from that MAC 
gets stronger, the beeping gets louder or faster or higher.  (Or use the 
three parameters to indicate three separate parameters of the 
signal/packet, such as signal strength, network type and size of packet).

My aim here is to get something together that I can assemble together 
reasonably easily.  I'm glad we've progressed away from my 
sub-nanosecond-timing idea.

Have fun,


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