On Wed, 2 Apr 2008, Oliver Mattos wrote: > To be honest I very much doubt the hardware in the wireless adaptors could > measure time in single digit nanoseconds, and even if they could it would > probably require a change in the over the air signal to use more bandwidth > (spectrum) for a "pulse" to get better time resolution, which in turn would > require hardware modification.
the commercial products are able to do it with unmodified laptops, so it should not require a change to the over-the-air signal (unless this generation of active antenna hardware isn't up to the task) > I would think the sound and signal strength meter are better metrics. > Remember although signal strength is a bad indicator by itself, it can be > much improved with 2 aerials and the large number of possible pairs to > measure signal strength between in a well linked mesh. the problem with trying to use sound is that it requres a clear path from the servers to the laptops, something I would not expect to see very much. it's also very sensitive to the direction the laptops are pointing. David Lang > On Wed, Apr 2, 2008 at 3:14 PM, Martin Langhoff <[EMAIL PROTECTED]> > wrote: > >> On Wed, Apr 2, 2008 at 4:27 AM, <[EMAIL PROTECTED]> wrote: >>> trying to work from signal strength won't work well, but you may be >> able >>> to triangulate based on the arrival time of the signal at various >>> locations. >>> >>> there are companies that do this commercialy with 3+ access points >> >> The recommended configuration for mid-to-high-end school servers has 3 >> active antennaes attached, and our recommendation is that they are >> placed well apart. They can be up to 10m apart due to USB cable lenght >> limits, and Wad mentioned 2m minimum recommended distance. If the >> distance is enough (in relation to the granularity of timers in the >> antennaes) then telling the XS about relative location of the >> antennaes could provide enough info. >> >> Having said that, I suspect that being able to do any of the above is >> somewhat far ahead in time ;-) >> >> cheers, >> >> >> >> m >> -- >> [EMAIL PROTECTED] >> [EMAIL PROTECTED] -- School Server Architect >> - ask interesting questions >> - don't get distracted with shiny stuff - working code first >> - http://wiki.laptop.org/go/User:Martinlanghoff >> _______________________________________________ >> Networking mailing list >> [EMAIL PROTECTED] >> http://lists.laptop.org/listinfo/networking >> > _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
