[GRLUG] OT, but GPS, anyone?

[Bob Kline]

Positional differences sort of cancel
anyway.  It's not clear than any errors
between two units are 180 degrees out
of phase.

Surveyors know a thing or two about
using GPS for very accurate measurements.
They usually put up a reference position,
and it becomes more accurate the more
GPS readings they take.  Accuracy of
millimeters is achived.

Maybe look up how they do things.  Then
ponder the difference between accuracy
and precision....

    -- Bob


On Wed, Aug 26, 2009 at 11:53 AM, L. V. Lammert <lvl at omnitec.net> wrote:

> Got a project where we need to establish a true N indiation on a
> stationary piece of equipment using a Linux host, .. if we had two GPS
> units, say, 25' apart it would be trivial (take the differential between
> the two readings and any positional errors cancel, producing a reference
> vector that can then be corrected to true N).
>
> Need to determine the *minimum* spacing between two units - don't
> suppose anyone knows anything about this sort of technology, or could
> point us in the right direction?
>
>        TIA,
>
>        Lee
>
> ==============================================
>  Leland V. Lammert            lvl at omnitec.net
>  Chief Scientist        Omnitec Corporation
>  Network/Internet Consultants www.omnitec.net
> ==============================================
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