HI Brian,
Yes, it is possible to get millimeter accuracy using sophisticated
techniques in GPS, but it is not trivial, or cheap. Such accuracy
requires
Surveying grade GPS receievers, simultaneous measurement, fancy data
stream integration (from the users GPS receiver, and the Differential
Reference receiver) and application of post processing software. I
believe that a A cheap, handheld, real time Differential receiver using
simple techniques should resolve to 30 ft horizontal, and less than that
horizontal...
73, DX, de Pat, AA6EG/N6IJ;
aa6eg@hh.tmx.com
599 DX Drive, Marina CA 93933
"The Contest Station from the Government"
On Tue, 22 Dec 1998, alsopb wrote:
> Pat,
>
> My understanding is that differential GPS is capable of millimeter
> resolution. Is that accurate enough? Among other things it is used by
> geologists to track extremely small changes in seismic areas which may
> indicate possible future activity.
>
> 73 de Brian /K3KO
> > ((D GPS), which provides higher accuracy than raw GPS,) probably will not
> > provide the accuracy you need to for terrain
> > profiles used in antenna modelling...especially the elevation readings,
> > which are quite innacurate unless sophisticated equipment is used....
> >
>
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