Subject:
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localization (was re: GPS)
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 11 Jan 2006 05:06:03 GMT
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Original-From:
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dan miller <danbmil99@*avoidspam*yahoo.com>
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Viewed:
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1720 times
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On another list, we've spent some time researching differential GPS. Turns
out it's not as simple as having two GPS units compare notes. You have to
know which satellites you are talking to, and that's complicated. They tend
to switch on and off randomly.
Truth is, centimeter (or even foot) accuracy with GPS is an expensive
proposition, in the thousands of dollars. If anyone knows different, I'd
love to hear about it, but I'm pretty sure it's not available. They make a
lot of money selling these units for surveying and farming, and there's no
market yet for cheap versions.
Localization, even in a known indoor space, is actually quite a difficult
problem. Outside is much worse. I've had some good luck using odometry and
path memory, using sonar and vision (one project used a lego robot with a
small laptop; scroll down this page to see it
http://www.danbmil.com/lego/index.html)
I'm very interested in seeing what can be done with NXT. My primary focus
is software (that's why I like Lego; no saws, screws, or drills!) If anyone
else is interested in sharing thoughts about applying some sophisticated
programming to this platform (especially if you happen to be one of the 100
chosen!) please let me know.
-dbm
--- Ignacio Martinez Vazquez <ignamv@gmail.com> wrote:
> > Hm. Well, when surveying I've sometimes used differential GPS
> (locating cave entrances, truth be told). This can get down to centimeter
> resolution IF you want to wait a long time, but certainy far better than 1
> meter. Two NXT's with GPS, one as a base station (stationary) to do
> differential GPS with?
>
> Cool! Might be complicated to calculate with the NXT, but I'm sure
> there's a way (PIC PIC PIC :). But how do you accurately find the
> coordinates of the base station? Google earth :P?
>
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Message has 2 Replies:
 | | Re: localization (was re: GPS)
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| "dan miller" <lego-robotics@crynwr.com> wrote in message news:20060111050603....hoo.com... <SNIP> (...) </SNIP> Blasphemy!!!! :P -Rob www.brickmodder.net (18 years ago, 11-Jan-06, to lugnet.robotics)
| | | Re: localization (was re: GPS)
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| (...) No, you do in general have to have them looking at the same satellites in the constellation at the same time, and even then there was a good bit of number manipulation to do. But the group I cave with did this with two laptops (to record the (...) (18 years ago, 11-Jan-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: GPS (was: mindstorms NXT and memory)
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| (...) Cool! Might be complicated to calculate with the NXT, but I'm sure there's a way (PIC PIC PIC :). But how do you accurately find the coordinates of the base station? Google earth :P? (18 years ago, 11-Jan-06, to lugnet.robotics)
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