[MLB-WIRELESS] OT: increasing GPS accuracy

[Tony Langdon, VK3JED]

At 11:35 AM 10/17/2006, you wrote:
>Just a quick OT question as I know many of you fiddle with GPS: if you had
>a reference GPS in a fixed location with long-term averaged co-ordinates,
>could you use the difference between the current and long-term reading
>from that GPS, to correct another (portable) GPS unit nearby?
>
>eg, say the long term position is x,y. At 09:01:30 the current reading is
>x+3,y-2. Can this offset be retroactively applied to the reading saved at
>the same time from a portable GPS?

Probably not, as averaging implies taking the average of a random set 
of errors, so there's no "fixed offset" to apply.  As an exercise, 
record the instantaneous and averaged position over a period of 
time.  This will tell you the answer to your question. :)

73 de VK3JED
http://vkradio.com