(changed topic to EE)
Joan Ilari wrote:

> >  I am working on a
> >  system using optical mice for relative tracking, and time of flight
> >  ranging for periodic absolute position corrections.
>
> I am very interested on this last point. Please, if you make any
> progress let me know ...
>
> Joan


This is exactly why most of the robot labs use IR beacons
on the walls. The robots can constantly determine their
position and re-calculate paths etc. Don't expect sensor
wheels to perform much better than driven wheels. Beacons
and fixed lines on the floor are used by industrial robots
for good reason. :o)
-Roman

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