7febc9fefb
- While I'm here, pet portlint for MD5 removal PR: ports/151834 Submitted by: Jason Harris <jharris@widomaker.com> (maintainer) Approved by: pgollucci (mentor, implicit)
24 lines
1.4 KiB
Text
24 lines
1.4 KiB
Text
On a stationary GPS without a differential correction signal, you
|
|
should see a 20 m average radius "drunken walk" pattern. On the same
|
|
receiver with DGPS corrections and a good view of the sky, the
|
|
error the same receiver with DGPS corrections and a good view of
|
|
the sky, the error should be reduced to approximately 2 m average
|
|
radius. If you've always wanted to know exactly where your house
|
|
is located without that annoying GPS "wander," but didn't want to
|
|
spend the money for a DGPS radio, here is your big chance!
|
|
|
|
I'd like to announce a fun DGPS hack. I've written a small Un*x
|
|
server and client for redistributing DGPS correction signals over
|
|
the Net. Basically the server grabs the serial byte stream from my
|
|
DGPS radio and sends it off over a TCP connection. The client does
|
|
the same thing but in reverse. The result is that you can receive
|
|
the local DGPS corrections from absolutely anywhere by using the
|
|
Internet as the world's largest extension cord. You'll still need
|
|
to be within 1000 miles or so of San Francisco, California, USA
|
|
for best results. However chances are better than not that the GPS
|
|
error will still be reduced if you are 2000 to 3000 miles away.
|
|
Several respondents from 2000 miles away have noted that the remote
|
|
differential signals have diminished the SA-induced position and
|
|
velocity errors by approximately 3 times.
|
|
|
|
WWW: http://www.madbavarian.org/gps/dgps-ip.html
|