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Re: [gpsd-dev] RC for DRIFT message
From: |
Greg Troxel |
Subject: |
Re: [gpsd-dev] RC for DRIFT message |
Date: |
Sun, 22 Feb 2015 18:00:19 -0500 |
User-agent: |
Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.4 (berkeley-unix) |
address@hidden (Eric S. Raymond) writes:
> I think top of the agenda for the next cycle is the additional report
> that Gary and Hal want for time service. This, as I understand it,
> should do for in-band time reporting what the PPS message does for
> PPS - that is, report the offset between in-band GPS time and the
> system clock.
>
> Almost everything about this feature is easy to specify. We can call
> it DRIFT or CLOCKDRIFT and it can have the same members PPS does -
> second and nanosecond parts for real (GPS) and CPU clock time.
"drift" implies frequency error. This is a phase error, or an offset.
So call it "clockoffset" or something.
> * When the first I/O from the report burst for a second is received.
>
> * When the report burst for a second is done and the other reports
> are omitted.
>
> Which do you guys actually want? I would favor the second - it fits
> into the existing logic better - but either will be relatively easy.
I don't think it matters, as long as it's close enough to when it was
measured to not cause trouble. The output should contain
system clock at time of meaurements
gps time - system clock (at above time)
more or less.
pgpkvkYwkA7qx.pgp
Description: PGP signature
- Re: [gpsd-dev] RC for DRIFT message, (continued)
- Re: [gpsd-dev] RC for DRIFT message, Hal Murray, 2015/02/22
- Re: [gpsd-dev] RC for DRIFT message, Eric S. Raymond, 2015/02/23
- Re: [gpsd-dev] RC for DRIFT message, Hal Murray, 2015/02/23
- Re: [gpsd-dev] RC for DRIFT message, Eric S. Raymond, 2015/02/23
- Re: [gpsd-dev] RC for DRIFT message, Hal Murray, 2015/02/24
- Re: [gpsd-dev] RC for DRIFT message, Eric S. Raymond, 2015/02/24
- Re: [gpsd-dev] RC for DRIFT message, Hal Murray, 2015/02/25
- Re: [gpsd-dev] RC for DRIFT message, Gary E. Miller, 2015/02/25
- Re: [gpsd-dev] RC for DRIFT message, Eric S. Raymond, 2015/02/26
- Re: [gpsd-dev] RC for DRIFT message, Gary E. Miller, 2015/02/23
Re: [gpsd-dev] RC for DRIFT message,
Greg Troxel <=