Joan Ilari wrote:
>
> >  I have thought on a LPS (that is, a Local Positionning System as
> >  opposed to GPS). More specifically I am thinking on using three
> >  ultrasound (or high freq. sound) beacons, all of them emitting
> >  simultanously and periodically  a given signal and compute the
> >  position and orientation of my rover by using the delay of the
> >  signals when reaching two onboard microphones separated a known
> >  distance (1 millisecond <=> 30 cms).


Hi Joan, you may be re-inventing the wheel. :o)
I also see potential problems with using sonic
beacons due to the high reflectivity of most
indoor surfaces.

Most robot labs are using infrared beacons, these
transmit a simple infrared code like a TV remote
does. The robot just needs a rotating infrared
sensor and can get reliable position sensing with
some simple triangulation calcs.

Infrared beacons are easier to build and will give
more accurate results. :o)

Maybe try a web search for "robot lab" and see
what some of the Uni guys are using.
-Roman

PS. You are probably getting off-list responses
as your "mail to" is set to you.

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