I have one valid question after all of the bandwidth about the terrain mapping.
When you take the 40X glass and get all of this broken down to presentable form,
what are you going to gain in proformance and pattern to the DX who is half way
around the world. How really effective is all of this in the near field when we
are really interested in getting out to the afar field and hearing them. You
will
need the 40X glass to get the fly S--- out of the 2 1/2 tons of calculations and
paperwork. After all of this work and the suspots get better and the propagation
improves you will still be out reading maps and when you come in we will be in
the
next sunspot cycle.
My .02 worth??!!!
73
Have a Happy Holiday season.
Hank
Eric Gustafson wrote:
> Well, the high cost idea is correct. But the post processing
> software step is unnecessary. We locate shovel bucket positions
> to an RMS error sphere with a radius of tens of centimeters in
> real time. The GPS data is not the largest source of our error.
> But the receiver (even just as an OEM module) costs about $2400.
> To that must be addded the cost of the reference station and the
> data link to get the differential corrections to the field unit.
>
> 73, Eric N7CL
>
To: <towertalk@contesting.com>
> >Date: Tue, 22 Dec 1998 18:26:05 -0800 (PST)
> >From: Pat Barthelow <aa6eg@hh.tmx.com>
> >
> >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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