[FOSS-GPS] rtknavi vs rtkrcv

[Fred Labrosse]

David and all,

But this input is not used (type is off).  In most cases, our computers are 
not connected to the Internet (mobile base and robots in the field).

I still have not found out where rtkrcv stores the ephemeris data.  I had a 
*quick* look at the sources to see if there was anything obvious, but I 
couldn't see it if there was.

Cheers,

Fred

On Monday 02 November 2015 09:06:55 David Kelley wrote:
> Fred:
> I do not see why it would not work.
> The line
> inpstr3-path      
> =anonymous:passwd at cddis.gsfc.nasa.gov/gps/products/%W/igu%W%D_%hb.sp3.Z:
> :T=-14400,21600,7200,600 seems correct to me.
> 
> I need to review how the SP3 formats differs to be sure that RTK can
> consume it, we normally use Bcast orbits here, somewhere in the back of
> my mind was a mental note that SP3 was not supported in all the tools
> and all the flows.  If yoy are still seeing it work then now work in odd
> conditions, track down the temp directory and look very close at any
> other file it might be keeping a prior set of ephemeris in. 
> 
> 
> Regards
>  David Kelley
> 
> On 11/2/2015 1:00 AM, Fred Labrosse 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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