> Sonar is very imprecise compared to visual
> systems,
True. I really liked the scanning-LASER technique that someone at MIT
developed (if I recall properly). It appeared to me to be potentially
very accurate.
> and it presents unique challenges, since each ping is a single
> point return with a certain amount of fuzziness involved.
That is because the return is not from a point but rather is from an
area whose energy decreases as you move off-axis.
40KHz has a wavelength of about 8mm. All the good information is in
the wavefront there is no interference ... yet. I think that if you
want to use short sound waves you are going to have to bring the raw
return in and process it better.
> The big question
> will be whether or not the fuzziness can be overcome, but that's why
> it's a
> hobby.
How much time and processing power do you want to throw at it? As I
said, the scanning-LASER where the plane of the receptor is different
from the plane of the scanner (there is probably a name for this
approach and I apologize for not knowing it) struck me as being an
elegant and simple approach to the problem. If people don't like the
scanner drawing red or green lines on them, use an IR LASER. Most
modern imaging devices happily work in the near IR.
--
Brian Lloyd Granite Bay Montessori
brian AT gbmontessori DOT com 9330 Sierra College Blvd.
+1.916.367.2131 (voice) Roseville, CA 95661, USA
I fly because it releases my mind from the tyranny of petty things . . .
— Antoine de Saint-Exupéry
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