Re: gpsrinex test

[Gary E. Miller]

Yo John!

On Tue, 5 May 2020 15:15:20 -0400
John Ackermann N8UR <address@hidden> wrote:

> I did 24 hour data runs of ZED-M8P and ZED-F9P capturing raw data with
> gpspipe.  Then I fed that data into both gpsrinex and the rtklib
> convbin tool and sent both off to NRCan for processing.  See the
> attached summary.

Cool!  How about OPUS, Trimble, etc?

> Good news -- the results are very similar, though not identical.  The
> errors are in the 1 mm range so nothing to complain about.

Well within the Sigma(95%).  But someone will complain...

> I believe the differences may result mainly from gpsrinex generating
> fewer epochs from the same data than convbin.  Starting with the same
> nominally 24 hour raw .ubx file, gpsrinex generated 30 second epochs
> covering  23:57:29.990 while convbin generated 30 second epochs
> covering 23:59:29.990, so 4 epochs more.

AFAIK, ubxtool is processing the data just once.  So the first epoch is
when gpsrinex has a complete UTC data/time.  That takes a few cycles to
get at the start.

> See another message for info about the high number of rejected epochs
> in both result sets.

Pretty normal.

RGDS
GARY
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Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
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