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Re: ntrip and sending position

From: Gary E. Miller
Subject: Re: ntrip and sending position
Date: Wed, 18 Dec 2019 13:48:36 -0800

Yo Greg!

On Wed, 18 Dec 2019 10:22:54 -0500
Greg Troxel <address@hidden> wrote:

> "Gary E. Miller" <address@hidden> writes:
> >> > Which is why some GNSS receivers can use NTRIP from the netvia
> >> > your phone.  Or post process the data.    
> >> 
> >> exactly where I am going.  
> >
> > Both NTRIP and PPP?  
> 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.

> I am headed to corrections over the internet to get more accurate
> real-time positions via navigation solutions, so I can map in the
> field, and also later.  I would be very happy with 2m accuracy.

Good luck with that.  My NEO-M8T getting RTCM2 corrections from
a station 2 miles away gets maybe a CEP(50) of maybe 3 meters.  I guess
I need to run a gpsprof on that.

> 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.

> I would like to get RTK working, but my impression is that one needs
> unobstructed views and good signals, unless you get recent high-end
> equipment.

All GNSS receivers do better with better sky views and better signals.

No reason your base should not have a great sky view and signals.

The main problem on a rover will be multipath, which is why "survey
grade" receivers have the choke ring or ground plane.  The aluminum
disk from an old 3.5 hard drive, placed directly under your antenna,
will help a bit.

I don't see much improvement with expnsive equipment over a ZED-M9P.

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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