 | | Re: localization (was re: GPS) —Brian Davis
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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 (...) (19 years ago, 11-Jan-06, to lugnet.robotics)
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| | | | | Re: localization (was re: GPS) —Chris 'Xenon' Hanson
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| | | | I've always been partial to ultrasonic rangefinding. It's not too difficult indoors under controlled circumstances. The old Nintendo PowerGlove used this technique. For robot localization, you'd probably want a minimum of three non-moving marker (...) (19 years ago, 11-Jan-06, to lugnet.robotics)
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| | | | | | Re: localization (was re: GPS) —John Barnes
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| | | | (...) I have tried all sorts of tricks with ultrasonic stuff, you're right :) There are a couple of different schemes for the ultrasonic beacon type things. You can have ones which are triggered from the 'bot via radio or IR. I've tried the IR one. (...) (19 years ago, 11-Jan-06, to lugnet.robotics)
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| | | | | | Re: localization (was re: GPS) —Roger Glassey
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| | | | | Hi John, A localization scheme I have used with the RCX is uses the angles between light beacons in known locations, measured with a rotating light sensor. Two angles (3 beacons) are enough to calculate, with a bit of trig, the robot coordinates and (...) (19 years ago, 12-Jan-06, to lugnet.robotics)
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| | | | | | | Re: localization (was re: GPS) —steve
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| | | | | | | (...) There are lots of interesting varients on that theme: 1) A lateral thinking way to do that is to reverse the situation. Put a rotating laser pointer on top of the robot and hook up light sensors in the corners of the room to another (...) (19 years ago, 12-Jan-06, to lugnet.robotics)
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| | | | | | | Re: localization (was re: GPS) —John Barnes
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| | | | | | (...) I also played with a light beacon system, but with a twist. Well actually two twists. I used small pieces of "rear view mirror repair kit" mirror to make some 45 degree rotatable mirrors. These mirrors were used to make beacons with (...) (19 years ago, 12-Jan-06, to lugnet.robotics)
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| | | | | | Re: localization (was re: GPS) —Rob Antonishen
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| | | | | (...) Have you checked out the ARTag software? (Agumented Reality Tagging) I downloaded the Rev1 demo (2 is out now) and it was really amazing, even using a super-cheap web-cam: (URL) sdk provides the means to identify their graphical tags, as well (...) (19 years ago, 12-Jan-06, to lugnet.robotics)
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| | | | | | Re: localization (was re: GPS) —Chris 'Xenon' Hanson
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| | | | (...) ;) (...) Right. I'm assuming something that basically assumes Line of Sight between bot and 3 or more beacons, just like GPS. GPS doesn't deal well with multipath either. ;) > The other thing you have to do is be able to address (...) Right. (...) (19 years ago, 12-Jan-06, to lugnet.robotics)
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