[clug] WiFi Direction Finder
Michael.James at csiro.au
Fri May 6 01:33:33 GMT 2005
On Fri, 6 May 2005 10:39 am, Paul Wayper wrote:
> Sweep the stick around, and when the timing difference
> was exactly the same as the distance between the aerials
> (or, more generally, approached a maximum),
> your stick points to the access point.
The sin function is flat at 1 (maximum)
but has a gradient of 1 at 0 (minimum).
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.
Yes, checking which aerial was ahead at maximum
would tell you which way to sight... ;^)
One solution would digitise both inputs,
use software to define windows
when the target station is transmitting,
and check the alignment within those windows.
When we see you wandering around
with a pair of wifi aerials rotating
we will know what you are up to.
How far can you get before you have to de-convolute echoes?
Michael James michael.james at csiro.au
System Administrator voice: 02 6246 5040
CSIRO Bioinformatics Facility fax: 02 6246 5166
Internet Explorer is fine for downloading Firefox,
but after that....
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