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 22:06:16 GMT
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Viewed:
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1212 times
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In lugnet.robotics, Danny Staple wrote:
> 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...
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 job. I've worked with a number of "solutions" but none of them are
anything I'd recommend.
I am just hoping that sooner or later there's going to be a breakthrough, but I
cannot imagine what kind of technology it might involve. RF and ultrasonic
solutions are plagued by multipath problems and light suffers obscuration.
Electrostatic and magnetic fields are only good for a few feet unless large
energies are used. So whatever the final solution may be ..
I want one!!!
JB
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Message has 1 Reply:
 | | Re: GPS Reality?
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| (...) Humans and most animals have evolved to solve this navigation problem. The result isn't 100% perfect (as anyone who ever got lost walking in the woods will tell you). They use their eyes and a continually updatable mental map. That's the ideal (...) (20 years ago, 11-Apr-05, to lugnet.robotics)
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Message is in Reply To:
| | Re: GPS Reality?
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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 (...) (20 years ago, 10-Apr-05, to lugnet.robotics)
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