RINEX update

[John Ackermann N8UR]

Last night I saved a couple of hours of raw observations from my M8P
using gpspipe.  I thought using the single-frequency receiver would
reduce the number of variables.

This morning I generated .obs files from that data using gpsrinex and
also rtklib's convbin program.

I sent both .obs files to NRCan.  It processed the version from convbin,
and rejected the version from gpsrinex.

If the list accepts files this big, attached are a zip file containing
the raw .ubx log and the two RINEX files, and another zip with the NRCan
results for the convbin file.  If they don't come through, I'll share
them via Dropbox.

I tried comparing the two RINEX files by eye, but the differences
between version 2.11 used by convbin and 3.03 used by gpsd are such that
it's hard for me to spot much except:

1.  The convbin file includes only C1 and L1 data (not D1), and only
specifies those two fields in the header, while the gpsd file specifies
six fields in the header and includes C1 L1 and D1 in the data with the
other fields left blank (which I believe is OK).

2.  The convbin file starts at 23 22 29.9940000, while the gpsd file
starts at 23 25 00.9940000 -- 2 1/2 minutes later.

3.  Both files wrote at 30 second intervals, but the convbin sequence is
at 29 and 59 seconds, so apparently the timetags do *not* have to be at
the 00 and 30 integer second points, at least for NRCan.

3.  Looking at contemporaneous data stanzas, the observations do not
seem to line up at all.  Although the SVs seem to be listed in different
order, I don't see any matching values column-to-column. (The stanzas
are offset by one second, but even over 30 seconds the values in each
file for each SV don't change in a gross way, so I don't think the
offset makes much difference for eyeball purposes.)

4.  I haven't fully figured out the rules for the LLI bit, but where
shown it doesn't seem to match up between the two files.

Thanks,
John

n8ur_m8p_data.zip
Description: Zip archive

n8ur_m8p_convbin.zip
Description: Zip archive