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A comment on The Roomba for Lawns Is Really Pissing Off Astronomers. Parent comment

Re:The Roomba for Lawns Is Really Pissing Off Astronomers by pjc50 on Thursday April 16, 2015 @11:10AM (#9388453)
GPS accuracy on its own is nowhere near good enough. Differential GPS can give you 1cm accuracy: http://www.blackroc-technology.com/technologies/gnss/dgps/
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Re:The Roomba for Lawns Is Really Pissing Off Astronomers by 0xffff2 on Thursday April 16, 2015 @11:14AM (#9388487)
It seems like installing the base station for differential GPS would be easier than installing the electronic fencing descried in the article.
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Re:The Roomba for Lawns Is Really Pissing Off Astronomers by pjc50 on Thursday April 16, 2015 @11:17AM (#9388518)
Yes, although it may be more expensive (I suspect you have to license a whole pile of patents)
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Re:The Roomba for Lawns Is Really Pissing Off Astronomers by oh_sigh on Thursday April 16, 2015 @11:35AM (#9388667)
Easier, maybe? But it would cost tens of thousands of dollars and be subject to even more regulations, so I don't think that is a good solution.
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Re:The Roomba for Lawns Is Really Pissing Off Astronomers by 0xffff2 on Thursday April 16, 2015 @01:01PM (#9389232)
Why would it be subject to more regulations? You just need two GPS receivers and a way to link them (e.g. WiFi).
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Re:The Roomba for Lawns Is Really Pissing Off Astronomers by oh_sigh on Thursday April 16, 2015 @09:57PM (#9391890)
Sorry, but I don't think you know how differential GPS works. It is not just using two GPS devices and averaging their location. Wikipedia is a good place to start: http://en.wikipedia.org/wiki/Differential_GPS
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