Who let Hank out ?
> ----------
> From: Dan Arney[SMTP:kn6di@groupone.net]
> Reply To: kn6di@groupone.net
> Sent: Wednesday, December 23, 1998 1:36 PM
> To: n7cl@mmsi.com
> Cc: towertalk@contesting.com; alsopb@gloryroad.net; aa6eg@hh.tmx.com
> Subject: Re: [TowerTalk] Measuring Terrain Slope / Elevation
>
>
> 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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>
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