Subject:
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Re: GPS Reality?
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Newsgroups:
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lugnet.robotics
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Date:
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Sun, 10 Apr 2005 14:03:36 GMT
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Reply-To:
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danny@NOMORESPAMorionrobots.co.uk
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Viewed:
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1621 times
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Its worth pointing out that there has been recent discussions on the DPRG
list about small scale location - a discussion which started off on GPS. I
think it has now progressed to a system combining three sonar beacons,
which are broadcast a radio ping, and then transmit each of their signals.
The bot controller than uses the time difference between the request radio
ping, and the sonar reply to work out its position.
Location on a small scale looks to be a fairly awkward problem...
--
http://orionrobots.co.uk - Learn to build robots
On Sat, 9 April, 2005 6:55 pm, Steve Baker said:
<Snip>
> Standard GPS is accurate to AT BEST about 10 feet. Typically, 20 or even
> 40 feet
> if there is no clear view of the sky, or if it's cloudy, under trees
> (especially
> wet trees soon after rain). GPS reception is also MUCH worse when the GPS
> unit is
> close to the ground - holding one up above your head generally gets you
> better
> reception than holding at waist height for example.
<snipped>
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Message has 2 Replies:
 | | Re: GPS Reality?
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| (...) Is anyone familiar with the old Nintendo PowerGlove hardware? It did crude 3D triangulation based on a pair of pulsed ultrasonic emitters and a triad of receivers in a known (fixed) configuration. I have a couple of PowerGloves, but never came (...) (20 years ago, 10-Apr-05, to lugnet.robotics)
| | | Re: GPS Reality?
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| (...) Yep! Also known as "the short range navigation problem". Everyone from DARPA to DoD to every would-be maker of a reliable automated lawn mowing system wants this. It is an amazingly hard problem which I graple with on a day to day basis as my (...) (20 years ago, 10-Apr-05, to lugnet.robotics)
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Message is in Reply To:
| | Re: GPS Reality?
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| (...) It's probably possible - making an infra-red transmitter to sit on the GPS side would get you there if the GPS could be made to run at a low enough baud rate. Alternatively, you could modify the RCX to take in RS-232 directly...but that's (...) (20 years ago, 9-Apr-05, to lugnet.robotics)
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