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this is my first freebsd ports commit, so please let me know if I missed something! _]:8)
23 lines
1.3 KiB
Plaintext
23 lines
1.3 KiB
Plaintext
On a stationary GPS without a differential correction signal, you
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should see a 20m average radius "drunken walk" pattern. On the same
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receiver with DGPS corrections and a good view of the sky, the
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error the same receiver with DGPS corrections and a good view of
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the sky, the error should be reduced to approximately 2m average
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radius. If you've always wanted to know exactly where your house
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is located without that annoying GPS "wander," but didn't want to
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spend the money for a DGPS radio, here is your big chance!
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I'd like to announce a fun DGPS hack. I've written a small Un*x
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server and client for redistributing DGPS correction signals over
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the Net. Basically the server grabs the serial byte stream from my
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DGPS radio and sends it off over a TCP connection. The client does
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the same thing but in reverse. The result is that you can receive
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the local DGPS corrections from absolutely anywhere by using the
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Internet as the world's largest extension cord. You'll still need
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to be within 1000 miles or so of San Francisco, California, USA
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for best results. However chances are better than not that the GPS
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error will stillb e reduced if you are 2000 to 3000 miles away.
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Several respondents from 2000 miles away have noted that the remote
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differenential signals have diminished the SA induced position and
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velocity errors by approximately 3x.
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