Positional differences sort of cancel<br>anyway. It's not clear than any errors<br>between two units are 180 degrees out<br>of phase. <br><br>Surveyors know a thing or two about <br>using GPS for very accurate measurements.<br>
They usually put up a reference position,<br>and it becomes more accurate the more<br>GPS readings they take. Accuracy of <br>millimeters is achived. <br><br>Maybe look up how they do things. Then<br>ponder the difference between accuracy<br>
and precision....<br><br> -- Bob<br><br><br><div class="gmail_quote">On Wed, Aug 26, 2009 at 11:53 AM, L. V. Lammert <span dir="ltr"><<a href="mailto:lvl@omnitec.net">lvl@omnitec.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Got a project where we need to establish a true N indiation on a<br>
stationary piece of equipment using a Linux host, .. if we had two GPS<br>
units, say, 25' apart it would be trivial (take the differential between<br>
the two readings and any positional errors cancel, producing a reference<br>
vector that can then be corrected to true N).<br>
<br>
Need to determine the *minimum* spacing between two units - don't<br>
suppose anyone knows anything about this sort of technology, or could<br>
point us in the right direction?<br>
<br>
TIA,<br>
<br>
Lee<br>
<br>
==============================================<br>
Leland V. Lammert <a href="mailto:lvl@omnitec.net">lvl@omnitec.net</a><br>
Chief Scientist Omnitec Corporation<br>
Network/Internet Consultants <a href="http://www.omnitec.net" target="_blank">www.omnitec.net</a><br>
==============================================<br>
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