🚀 go-pugleaf

In article <1992Apr7.031033.19729@njitgw.njit.edu> andrews@rehab.njit.edu (John Andrews) writes:
>     I am starting a project that requires me to locate and
>     track a device in 3-space.

 [stuff deleted]

The way I would do this is by using ultrasound.  Construct an imaginary
cube around the space you need to track the object.  In the center of each
of three non-parallel faces you put an ultrasound transducer (mike).

The object emits a short pulse of ultrasound every, say, 1/100 sec.  Then
you just see how long it takes the sound to get to each mike.  The equations
to find the location of the object should be easy.  

Using v=330 m/s, even just 1 MHz timing resolution will give you the location
accurate to 0.3 mm.  

Of course, the object will have to be attached by a little wire, unless you
want to use radio to synch everything up.



-- 
Johan Thornton
(but my friends call me jthornto@ee.ubc.ca)