Alt-BEAM Archive
Message #08470
To: beam@sgiblab.sgi.com
From: "johannes urke" j_o_h_a_n_n_e_s_@hotmail.com
Date: Mon, 20 Dec 1999 12:42:33 CET
Subject: [alt-beam] Re: Lets Hypothesise...
ok sorry to say but you are wrong richard
the triangulation needs three points (you were right about that).
but it has 1:eye or ear 2:eye or ear 3:the object thats being measured.
>From: "Richard Caudle"
>Reply-To: beam@sgiblab.sgi.com
>To:
>Subject: Re: Lets Hypothesise...
>Date: Sun, 19 Dec 1999 23:44:35 -0500
>
> >
> > If any of this was true, then we would all have one eye and one ear.
>The
> > truth is that distance is quite an important factor in navigating our
>world.
> > We have two eyes and two ears so we can triangulate distances.
> >
>
>Pish, Posh! The single eye/ear thing would work in a two dimensional
>world,
>but we happen to be in a three dimensional world. It's go nothing to do
>with triangulation. We have to percieve objects in a three dimensional
>space. The only time distance enters into the formula is when we are
>making
>a conscious effort to determine distance. Besides, I thought that
>triangulation took three points, not two.
>
>Prove me wrong.
>
>Richard, the Stubborn
>
______________________________________________________
8471 Mon, 20 Dec 1999 03:47:59 -0800 [alt-beam] Hypothesis beam@sgiblab.sgi.com SilverGhost Elmo,
Just need some more info:
1. Between any two bots of a group of how many bots?
2. Maximum separation distance?
3. Measurement through media interface (ie water surface)?
4. How fast, how often?
5. Measurement while in motion?
6. Data format (analog,digital)?
7. Absolute position reference system available (ie scaled down GPS, bar
codes on floor)?
of course you could just tell us your application but this is actually
more fun.
wilf
From:
Elmo [SMTP:andrewe@ilid.com.au]
To:
Beam Mailing List
Cc:
Subject:
Lets Hypothesise...
I need some distributed neck-top processing power to help me solve a
problem that i think can help take BEAM to the next evolutionary step.
It is holding my designs back and it seems to be the fundamental
problem
with the "flocking" idea that is bouncing around at the moment.
QUESTION: How do you accurately measure the distance (and possibly
direction) between two robots (in millimeters or less resolution) in:
a) Air
b) Water
c) Space
d) All of the above
IDEAS:
Ultra Sonic Sonar: Works in a) & b) but not in c)
IR Radar: Works in a) & c) but not very well in b)
Metal Detection: Works in d) but only with ferrite robots and only
at
close ranges.
Microwave Length Radar*: Works in a) and c) but not very well in b)
Long Wave Length Radar*: Works in d)
Laser Range Finding: Works in a) and c) but attenuates quickly in b)
* Unfortunately requires lots of power
Any others? Comments?
Note that the solution doesn't necessarily have to work in all three
mediums.
Elmo the brain stormer
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