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Re: ntrip and sending position
From: |
Gary E. Miller |
Subject: |
Re: ntrip and sending position |
Date: |
Wed, 18 Dec 2019 15:50:36 -0800 |
Yo Greg!
On Wed, 18 Dec 2019 17:32:38 -0500
Greg Troxel <address@hidden> wrote:
> "Gary E. Miller" <address@hidden> writes:
>
> >> I find that WAAS isn't as good as local DGPS from the USCG used to
> >> be, even with a clear sky view. But I have no hard data.
> >
> > Of course. Local corrections are better than wide are corrections.
> > But some GNSS receivers consider them equal when turning on DGPS
> > status bit.
>
> Agreed that they both count as DGPS. I just meant that I suspect that
> between local and rate that the local ones are better.
Often.
> >> I have the impression PPP requires static observations for a
> >> longish time, vs being able to produce a gpx of a moving receiver.
> >>
> >
> > 10 to 15 mins is considered the minimum. Getting better up to about
> > 24 hours of data. There are services that will post process moving
> > data, at less precision. That is essentially the same as RTK.
>
> And it probably needs the same kind of not having cycle slips as RTK.
Cycle slips happen. To avoid them you need to move really slowly.
Even a fast walk can be too fast. Even stationary I get them as
sats cycle through the used list.
> > All GNSS receivers do better with better sky views and better
> > signals.
>
> Sure. I meant that RTK doesn't really work at all without good views.
No GNSS receiver works without good views.
> > No reason your base should not have a great sky view and signals.
>
> My base is run by MassDOT, and has Leica stuff that I'm sure is very
> spiffy. So I expect high-end performance on that side of things.
Such were my expectations of ORGN. The results, not so much.
> > I don't see much improvement with expnsive equipment over a
> > ZED-M9P.
>
> I had some offlist conversations with a Trimble emploeyee, who claims
> that their stuff can do RTK with tree cover, and sent me imagery
> where I can't see the ground.
I've rarely had problems with trees.
> If you are succeeding at < 10cm RTK
> with a ZED-M9P and some antenna under tree cover -- or even if in the
> open -- please post part numbers and I may try it out.
I was getting 1cm years ago with Skytraq and RTK. Never tried with
trees. I do not have even one of thee two ZED-M9P I'd need to test.
RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
address@hidden Tel:+1 541 382 8588
Veritas liberabit vos. -- Quid est veritas?
"If you can't measure it, you can't improve it." - Lord Kelvin
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- ubxtool and python 3, (continued)
- ubxtool and python 3, Greg Troxel, 2019/12/17
- Re: ubxtool and python 3, Gary E. Miller, 2019/12/17
- Re: ubxtool and python 3, Greg Troxel, 2019/12/18
- Re: ubxtool and python 3, Gary E. Miller, 2019/12/18
- Re: ubxtool and python 3, Greg Troxel, 2019/12/19
- Re: ubxtool and python 3, Bernd Zeimetz, 2019/12/20
- Re: ntrip and sending position, Gary E. Miller, 2019/12/17
- Re: ntrip and sending position, Greg Troxel, 2019/12/18
- Re: ntrip and sending position, Gary E. Miller, 2019/12/18
- Re: ntrip and sending position, Greg Troxel, 2019/12/18
- Re: ntrip and sending position,
Gary E. Miller <=