From: Colin Hales (colin@versalog.com.au)
Date: Tue Sep 03 2002 - 07:42:08 MDT
Amara Graps
>
> Colin Hales:
> >I spent a couple of years (straight out of Uni, 1979) working in
> >England analysing the garbage collected by an airborne sea-search
> >radar.[...]
>
> >The data is called called clutter. Wicked stuff, clutter. Looks
> >white at first glance, but --nope-- all sorts of deterministic
> >phenomena are buried in it. I wrote a whole bunch of software to do
> >autocorrelation functions and power spectral densities. [...]
>
> >Thing is, you've really got to watch out for behaviour on different
> >timescales. Deterministic behaviour can poke its wicked little head
> >into things in all sorts of ways (which is how you see a
> >periscope/snort sticking out of the waves in a force 8 gale from 50
> >miles).
>
>
> Did you catch any whales?
>
> Here's a singing blue whale in wavelet space:
>
> http://www.amara.com/blueA1_mid.jpg
>
> Is that cool or what ?
(I gather A = 440Hz)
Now that'd be clutter worth collecting!
Funnily enough if you got the radar data in the right weather and displayed
it right and kind of squint a bit from the other side of the room, you could
probably make it look like that. I think it more likely we'd get a big data
hole/shadow right where the whale's big butt killed off all the glinting
surface-facets that make the clutter. I'm not too sure whether whales soak
up 10GHz when wet or not. Come to think of it, who cares!
Oops. Way back then that number was a secret. Now I'm going to have to kill
everyone on the list. Sorry, can't be helped, nothing personal! :-)
The stuff you collect! Amazing...
Colin
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