[FOSS-GPS] rtknavi vs rtkrcv

[Fred Labrosse]

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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