[FOSS-GPS] rtknavi vs rtkrcv

Tue Nov 3 12:25:01 PST 2015

Hi Fred,

The ephemeris of both gps and glonass are saved in the rtkrcv.nav file, but
probably only from the rover (I think you can change that on rtkrcv.conf,
but by default you only use the ephemeris received from the rover).

When you have rtkrcv running, does the gnav count in status increment? If
yes, check in rtkrcv.conf if you have the glonass enabled (pos1-navsys = 5).

I think the command "sat 1" gives you information of the valid satellites,
so it's normal that you just see one set of them.

The command "obs 1" gives you information about the observations of both
rover and base station, so you should have 2 sets there.

Lastly, the command "nav 1" shows you the ephemeris received.

Best,

Jaume
On Nov 3, 2015 12:21 PM, "Fred Labrosse" <ffl at aber.ac.uk> wrote:

> Hi Jaume,
>
> Thanks for that.  I had it running for quite a while yesterday, and it did
> save a rtkrcv.nav file that indeed contains ephemeris data for 'G'
> satellite (presumable GPS).  There is no rtkrcv.gnav file, although it did
> see R (glonass) satellites.
>
> Also, I was in kinematic mode, getting one receiver data from a server
> (str2str) and one directly from a serial port.
>
> In the rtkrcv "shell", the command "satellite 1" was apparently only giving
> one set of satellites (but "observ 1" giving me 2 sets of observations) and
> I was getting a fix.  The 2 antennas were next to each other, so seeing
> similar satellites.
>
> Any idea if both base and rover ephemeris data is supposed to be saved and
> why glonass ephemeris data is not saved?
>
> Cheers,
>
> Fred
>
>
> On Tuesday 03 November 2015 11:24:38 Jaume Filbà wrote:
> > Ephemeris are the "nav" (gps) and "gnav" (glonass) messages.
> > In rtkrcv, a .nav file is saved with the ephemeris.
> >
> > On Nov 2, 2015 10:00 AM, "Fred Labrosse" <ffl at aber.ac.uk> wrote:
> > > Hi David,
> > >
> > > Thank you for this very useful answer.  See below.
> > >
> > > On Friday 30 October 2015 12:05:23 David Kelley wrote:
> > > > > If I make it display the satellites, I most of the time don't get
> > > > > any,
> > > > > sometimes 1, sometimes a full set.
> > > >
> > > > Two questions to consider.  This makes me wonder if you are
> > > > reliability
> > > > getting ephemeris data.  Is that what you mean when you say you can
> > > > not
> > > > display the satellite?  In the configuration you have created, can
> > > > you
> > > > describe what is the path over which the ephemeris messages get to
> > > > the
> > > > navigation filter?
> > >
> > > I have no idea.  The only thing I can see that refers to ephemeris is
> > > set to broadcast.  I attach my config, in case it helps.
> > >
> > > > [Aside: It took me quite a bit of trial and error and the help of
> > > > other
> > > > folks on this list to find out that RTKLIB stores recent past
> > > > ephemeris
> > > > data in the .ini files.  Sometime a config worked, sometimes it did
> > > > not.  Turned out the data from a recent past run was still present. I
> > > > learned to edit the end of the ini file to remove this when I wanted
> > > > to
> > > > test out cold starting issues. Perhaps you are seeing something of
> > > > the
> > > > same sort.
> > > >
> > > > PS these lines look like:
> > > > eph_01=G02,38,38,0,0,14460624...0,
> > > > eph_04=G05,96,96,0,0,14460......
> > > > eph_11=G12,63,63,0,0,1446....  etc.     ]
> > >
> > > This is interesting.  I was wondering about that because it seems that
> > > the receivers I use do not store that (NV08C).  What would be the
> > > eequivalent for rtkrcv?  I have looked but couldn't find an
> > > equivalent.
> > >
> > > Cheers,
> > >
> > > Fred
> > >
> > > > On 10/30/2015 10:19 AM, Fred Labrosse wrote:
> > > > > All,
> > > > >
> > > > > I have been trying to use the unix applications, after getting good
> > > > > results with the Windows ones.
> > > > >
> > > > > I now have a (unix) server that serves data from one receiver for
> > > > > now
> > > > > and if I connect rtknavi (windows) to it in PPP-static I get a fix
> > > > > quite quickly.  If at the same time I connect rtkrcv to the same
> > > > > server, the result is not so good.  If I make it display the
> > > > > observations (observ 1), I do get data that is similar to what I
> > > > > see
> > > > > in rtknavi.  If I make it display the satellites, I most of the
> > > > > time
> > > > > don't get any, sometimes 1, sometimes a full set.  This seems to be
> > > > > random between stop/starts.  Waiting does not seem to help. If I
> > > > > manage to get a fix in rtkrcv, stop and restart it, usually I don't
> > > > > get a fix.  However, if I do the same in rtknavi, I get a fix
> > > > > almost
> > > > > immediately.
> > > > >
> > > > > What have I missed?
> > > > >
> > > > > Cheers,
> > > > >
> > > > > Fred
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