[time-nuts] Crude Survey Technique

[Attila Kinali]

On Thu, 21 Nov 2013 19:47:03 -0500
"Dale J. Robertson" <dale at nap-us.com> wrote:

> An interesting technique for improving the accuracy of single band gps is 
> embodied in an open source program/project called rtklib.
> Essentially it uses one GPS receiver in a fixed location that has been very 
> carefully surveyed (gps reported location averaged over a long period) as a 
> phase reference.
> The roving receiver then uses the raw phase data from the base to subtract 
> errors in the location of the rover.
> 10 cm accuracy is achievable in real time using consumer grade GPS 
> receivers,

If you go non-realtime you can acheive sub-cm accuracy.
A project i was involved with at the side lines uses LEA6-T modules and
records the phase data. Processing over 4-6h data gives then something
in the range of 4mm accuracy.

				Attila Kinali

-- 
1.) Write everything down.
2.) Reduce to the essential.
3.) Stop and question.
		-- The Habits of Highly Boring People, Chris Sauve