mirror of
https://git.FreeBSD.org/ports.git
synced 2024-11-14 23:46:10 +00:00
23 lines
1.3 KiB
Plaintext
23 lines
1.3 KiB
Plaintext
|
On a stationary GPS without a differential correction signal, you
|
||
|
|
should see a 20m 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 2m 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 stillb e reduced if you are 2000 to 3000 miles away.
|
||
|
|
Several respondents from 2000 miles away have noted that the remote
|
||
|
|
differenential signals have diminished the SA induced position and
|
||
|
|
velocity errors by approximately 3x.
|