Re: [gpsd-users] Strange loss of 3d fix

[Gary E. Miller]

Yo Svenn!

On Sun, 18 Aug 2019 21:40:05 +0200
Svenn Are Bjerkem <address@hidden> wrote:

> On Fri, 16 Aug 2019 at 22:28, Gary E. Miller <address@hidden> wrote:
> > What does "gpsprof" and "gpsprof -t polar" show?
> >  
> 
> svenn@debian01:~/work/prg/git/gpsd$ ./gpsprof
> gpsprof: 10677 looking for fix...first fix in 0.03sec, gathering 100
> samples......(66.03 sec) done.
> set title noenhanced "2019-08-18T19:15:39, u-blox, 115200 8N1, cycle
> 1s\nSW EXT CORE 1.00 (94e56e),HW 00190000,ROM BASE
> 0x118B2060,FWVER=HPG
> 1.11,PROTVER=27.10,MOD=ZED-F9P,GPS;GLO;GAL;BDS,QZSS" Traceback (most
> recent call last): File "./gpsprof", line 1196, in <module>
>     sys.stdout.write(plot.plot())
>   File "./gpsprof", line 602, in plot
>     ) % (calc_cep, calc_2drms, fmt_lab11a, cep100_meters,
> UnboundLocalError: local variable 'fmt_lab11a' referenced before
> assignment

Oh, sorry.  Side effect of a recent change.  Fix pushed to git head.

What did "gpsprof -t polar" show?  I expected you to email me the
results.

Do this:
        gpsprof -T png > scatter.plot
        gpsprof -T png -f polar > polar.plot

Then email the plots to this list.  You can see the results this way:
        gnuplot scatter.plot > scatter.png
        gnuplot polar.plot > polar.png

Then we can see you skyview and fix quality.

> svenn@debian01:~/work/prg/git/gpsd$ python -V
> Python 2.7.16+
> 
> I also tried with python3 ./gpsprof and got same error.
> svenn@debian01:~/work/prg/git/gpsd$ python3 -V
> Python 3.7.4

gpsd runs fine on Python 2 and 3.  The problem was change that had not been
fully completed.
 
> > I see NMEA, but no u-blox binary.  Did you try to configure u-blox
> > binary?  What does "ubxtool -p GNSS" say?
> >  
> 
> svenn@debian01:~/work/prg/git/gpsd$ ./ubxtool -p GNSS
> ubxtool: poll GNSS
> 
> ubxtool: poll GNSS not found

I thought you had the release gpsd.  The command changed recently in 
git head.  Since you are on git head, do this:


./ubxtool -p CFG-GNSS
[...]
UBX-CFG-GNSS:
 msgVer 0  numTrkChHw 32 numTrkChUse 32 numConfigBlocks 7
  gnssId 0 TrkCh  8 maxTrCh 16 reserved 0 Flags x01010001
   GPS L1C/A enabled
  gnssId 1 TrkCh  1 maxTrCh  3 reserved 0 Flags x01010001
   SBAS L1C/A enabled
  gnssId 2 TrkCh  4 maxTrCh  8 reserved 0 Flags x01010001
   Galileo E1 enabled
  gnssId 3 TrkCh  8 maxTrCh 16 reserved 0 Flags x01010000
   BeiDou B1I 
  gnssId 4 TrkCh  0 maxTrCh  8 reserved 0 Flags x03010000
   IMES L1 
  gnssId 5 TrkCh  0 maxTrCh  3 reserved 0 Flags x05010001
   QZSS L1C/A enabled
  gnssId 6 TrkCh  8 maxTrCh 14 reserved 0 Flags x01010000
   GLONASS L1 

You see I have GPS, SBAS, Galileo andf QZSS enabled.  You will want
GLONASS enabled due to your high latitude.  What does that give you?


> > I prefer:
> >         gpspipe -w
> > and
> >         gpspipe -R
> >  
> 
> gpspipe -R gives me ascii-characters for something which must be the
> pure undecoded binary data from the ubx protocol.

Yup.  That is exactly what I wanted you to send to the list so we
could see it.  An easy way to capture it:

        gpspipe -w -n 300 > raw.log

The send raw.log to this email list so we can see what it happening.

> Is there a tool to pipe those characters into to convert them into
> readable hex data?

If you want real time decode, you do this:
        ubxtool

But I prefer you send us the raw binary.  You can see whbat is in the
ra.w log this way:

        ubxtool -F raw.log

What did the "gpspipe -w" show you?  I was expecting you to send that to
this list so we could see it.  An easy way to capture it:

        gpspipe -R -n 300 > json.log

> should I always use -P 27 to specify version of ubx protocol for f9p?

Yes, a few commands change depending on your protocol version.  So best
to always use it.  You can put that, once, into UBXOPTS, so it is always
there.  Like this:

        export UBXOPTS="-P 27"
        ubxtool -p CFG-GNSS

To summarize, send us the output of:

        gpsprof -T png > scatter.plot
        gpsprof -T png -f polar > polar.plot
        gpspipe -w -n 300 > raw.log
        gpspipe -R -n 300 > json.log

That would be the files:
        scatter.plot
        polar.plot
        raw.log
        json.log

RGDS
GARY
---------------------------------------------------------------------------
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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