[FOSS-GPS] rtknavi vs rtkrcv
jaumefilba at gmail.com
Tue Nov 3 02:24:38 PST 2015
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.
> > 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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