[talk-au] new toy found by son

Elizabeth Dodd edodd at billiau.net
Thu Oct 1 13:44:20 BST 2009


On Thu, 1 Oct 2009, John Smith wrote:
> > On Thu, 1 Oct 2009, John Smith wrote:
> >> Oh that's easy then, get him to figure out how to semi-sync with the
> >> secondary GPS frequency, which is what high end surveying equipment
> >> does, you don't need to lock onto the signal, just get close enough to
> >> calculate the atmospheric effects on the L1 signal, and do it cheaply
> >> enough we can get less than 1m accuracy with consumer grade kit :D
> >
> > he's not using a D-GPS setup
>
> Using both GPS freq's isn't D-GPS, the biggest unknown with the
> regular GPS signal is delays in the ionosphere, being able to
> establish that using the secondary/military GPS freq takes out the
> uncertainity and you get a much more accurate signal
because i proof read and edit the manuscripts i get all of this already, 
however it ain't accurate enough in heavy vegetation cover or any of the usual 
places where mtb trails are

-- 
BOFH excuse #104:

backup tape overwritten with copy of system manager's favourite CD





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