On 24/10/2010 14:02, Olin Lathrop wrote:
> Michael Watterson wrote:
>> feed all 3 beacons with same length cable from one controller.
> Or the other way around.  Have the copter emit pulses and multiple receiv=
ers
> scattered around at known fixed locations pick up the pulses and a master
> processing system compares the received times to find position.  Ultrasou=
nd
> should work for this.
>
Ultrasound better than RF for it.
--=20
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