[clug] WiFi Direction Finder
kim.holburn at anu.edu.au
Fri May 6 01:42:55 GMT 2005
On 2005 May 6, , at 11:33 AM, Michael James wrote:
> 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?
With a good directional antenna you can probably not worry about them?
> 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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