RX signal level calculation

Location Proj location at snet.wit.ie
Fri Feb 21 07:01:11 EST 2003


On Wed, 19 Feb 2003, Ricardo Galli wrote:

> On Tuesday 18 February 2003 19:25, Jean Tourrilhes shaped the electrons to
> shout:
> > 	Err... Either it's a bug, or it's another of those firmware
> > weirdnesses. Jouni is the one who know about the chip details. Anyway,
> > it seems that in recent firmware Intersil has added new support for
> > dBm calibration.
>
> I'm very interesting in this. I'm doint some tests to track station
> positions by using signal intensity values. There are already some
> promising results, in the range of 1.5 to 2 meters for indoors.
>
> But... with hostp i'm getting velus with a high variance under a static
> environment. Furthermore, I'm getting abosulte signal values smaller than
> 27 (intepreted as lowest level in the driver) but still rougly
> proportional to the stations's distance. I'm testing with firmware 1.3.4
> and 1.5.6.

Im also trying to determine indoor position using signal strength values.
We are seeing a small fairly predictable variance. Our cards are 1.4.2 or
1.4.9 with the ram upload, both give a signal readings of between 1 and
100.  Id prefer cards that gave a higer resolution but we have had good
results with these (1-2 meters) so far.

How high is the variance you are seeing?  ours is approx 5 vaues (ie
40->45 or 60-65 etc..)


--

Andrew

> --
>   ricardo galli       GPG id C8114D34
>
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