> 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).
>
> Do you think that this is feasable ? Has someone tried this
before ?

I haven't tried either but another approach you could consider is a
single microphone with a rotating parabolic dish. The strength of
the signal would peak when the dish is pointing at a beacon. Have
two identifiable beacons and calculate your position.
Suitable assemblies can be found on top of police cars. Just
replace the bulb with a microphone.
It would certainly look the part. :-)

Steve.


======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: steveb@tla.co.nz      fax +64 9 820-1929
======================================================

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