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Re: [gpsd-dev] Meaning of negative PPS offset?

From: Gary E. Miller
Subject: Re: [gpsd-dev] Meaning of negative PPS offset?
Date: Tue, 26 Aug 2014 11:41:19 -0700

Yo Miroslav!

On Tue, 26 Aug 2014 15:49:17 +0200
Miroslav Lichvar <address@hidden> wrote:

> On Tue, Aug 26, 2014 at 08:52:53AM -0400, Greg Troxel wrote:
> > So in general I think each receiver needs a characaterization of its
> > typical serial delay, and pps timestamps have to be disambiguated
> > with respect to that.
> > 
> > It might be that assuming serial is 100 ms early to 900 ms late is
> > good enough for all actually built receivers.
> Isn't this the time_offset function implemented in the individual
> drivers?

Yes.  After time_offset, the NMEA time should be at zero offset to
'actual' time.  

But careful, most drivers do not have accurate time_offset.  And the NMEA
jumps around a lot.

Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97701
        address@hidden  Tel:+1(541)382-8588

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