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Re: [gpsd-users] gpsrinex: collecting one 24h GPS-day?

From: Gary E. Miller
Subject: Re: [gpsd-users] gpsrinex: collecting one 24h GPS-day?
Date: Wed, 25 Sep 2019 17:41:52 -0700

Yo Greg!

On Wed, 25 Sep 2019 20:22:35 -0400
Greg Troxel <address@hidden> wrote:

> Sorry, I didn't mean the complexity of RINEX.

All one and the same.

> I meant that if "-i 30" means "sample every 30s, aligned to integral
> multiples of 30s in GPS time",

Actually, every 30s when "TAI module 30 is zero".  A few PPP programs
require it.  I can never get a good reason why...

> it would be nice to say that.  vs
> "sample right away, and then every 30s" vs "integral mulitples of 30s
> in UTC (assuming leap seconds don't exist, as is UNIX tradition).

Only the time of the report generation is in UTC, everything else is in
TAI time.  No leap seconds, etc.

All of this is 100% irrelevant to a person that wants to use gpsrinex.
The details in a RINEX file are mind numbing, then add in all the quirks
of the PPP services. gpsrinex tries to hide all that complexity.  It is
nice to have background information that may disappear on the next OPUS
upgrade.  Otherwise just clutter to a user.  Not useful for anything.

> I have so far not gone down the gpsd/RINEX path, so am reluctant to
> change docs based on my fuzzy understanding.

Fair enough.  I'm still trying to understand the confusion so I can
clean it up.  I already posted a PPP Howto update once today.

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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