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Re: [gpsd-dev] PPS over USB

From: Gary E. Miller
Subject: Re: [gpsd-dev] PPS over USB
Date: Wed, 2 May 2012 14:24:26 -0700

Yo Håkan!

On Wed, 2 May 2012 22:42:42 +0200
Håkan Johansson <address@hidden> wrote:

> > the ublox 6 has a special mode for single sat operations.
> Also the oncore has this mode.  I do not remember if the patches
> bypass the 'require-2d-fix to allow PPS timing' when the oncore
> device reported time as collected in this mode got into gpsd.  I'd
> need to get my equipment running again...

I looked a little deeper at the code. esr changed the code a while back
so that each driver needs to set PPSTIME_IS to mark that the PPS is good
by that drivers standards.  In spite of its name it also conditions
the sending of NMEA or binary time to ntp/chrony.

The garmin and NMEA 183 drivers set PPSTIME_IS after 4 consecutive 2D or 
better fixes.

I see code in the uBlox driver to the handle single sat time case, but
it looks a little off to me.  When in time mode it sets 3D mode which 
seems odd if time mode is single sat.

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

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