Subject:
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Re: robotica on TLC
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 6 Apr 2001 06:38:27 GMT
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Original-From:
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Steve Baker <SJBAKER1@avoidspamAIRMAIL.NET>
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Reply-To:
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sjbaker1@airmail%nospam%.net
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Viewed:
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4327 times
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"Micah J. Mabelitini" wrote:
>
> Steve Baker wrote:
> >
> > What I think it would take would be to add a rule that every robot must
> > contain a GPS unit and broadcast it's position continually for the other
> > competitor to pick up.
>
> GPS wouldn't work. Even though the government disabled Selective
> Availability last year, commercial GPS still doesn't achieve an accuracy
> better than several meters.
Differential GPS (where you add a 'ground station') gives you plenty
of precision - even without the low order bit scrambling thing.
It's not good for telling you where you are relative to the planet - but
relative to the ground station, it gets you within a couple of centimeters...
plenty for these meter-wide 'robots'.
I would imagine that for GPS to be suitable
> in such a competition, it would require an accuracy of no more than a
> few inches, and would require that all of the platforms were equipped
> with *exactly* identical GPS modules manufactured with very rigorous
> tolerances.
The TV company would presumably supply those in order to avoid cheating...
and they could be pretty high-end units.
> Also, getting a lock inside any building is difficult and
> unreliable at best, and it appears that these types of competitions are
> generally held in large steel buildings, an environment totally
> unsuitable for receiving a GPS lock.
Dunno about that...you could well be right. Does the presence of the
ground station inside the building fix that? I have no idea.
> What about some sort of standardized IR beacon pulse on an
> omnidirectional emitter, and equipping the platforms with a servo-driven
> rotating unidirectional detector? Since all of these competitions seem
> to be one vs. one
(No - BattleBots does an 8 robot 'rumble' from time to time - and the
British Robot Wars series has several 'games' where there are many
machines in the arena at once - with a set of robots designed by
the BBC (The "house robots") in nearly every competition.)
> have standard emitter designs with two pulse
> frequency settings. Then, one competitor could set their locator system
> to Mode 1, and the other to Mode 2, preventing a platform's emitter from
> interfering with its own detector.
Yes - something like that would work - but anything on the outside of the
case would get smashed off in short order I think...also many of the
designs have to work upside-down as well as right side up.
Since the arena is fixed, you could put light detectors in the floor
and have the TV company track where the robots are by knowing which
detectors are covered up...then broadcasting the locations of the
two machines by radio...there are LOTS of ways to make that kind
of thing work.
Anyway - the point is that to make a viable "true" robotic competition,
there would have to be some kind of mandatory tracking mechanism...you
could argue indefinitely about what it should be - but it's pretty
clear you could solve it.
--
Steve Baker HomeEmail: <sjbaker1@airmail.net>
WorkEmail: <sjbaker@link.com>
HomePage : http://web2.airmail.net/sjbaker1
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Message has 1 Reply:
 | | Re: robotica on TLC
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| (...) Yeah, DGPS would probably be accurate enough, assuming you could get around the no-lock problem. (...) I believe the on-board GPS receiver would still need to fix on the Navstar constellation, regardless of whether or not it was a (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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Message is in Reply To:
| | Re: robotica on TLC
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| (...) GPS wouldn't work. Even though the government disabled Selective Availability last year, commercial GPS still doesn't achieve an accuracy better than several meters. I would imagine that for GPS to be suitable in such a competition, it would (...) (24 years ago, 6-Apr-01, to lugnet.robotics)
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