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[gpsd-dev] Leap Second - end of June


From: Hal Murray
Subject: [gpsd-dev] Leap Second - end of June
Date: Mon, 26 Jan 2015 20:40:38 -0800

IERS has announced that there will be a leap second at the end of June.

GPS satellites started announcing it around the start of Jan 22 UTC.  (Or at 
least that's when I first saw it.  But who knows what sort of filtering or 
voting is going on inside the receivers.)

The leap-second pending info seems to confuse some GPS receivers.  They 
report times that are early by a second.  I have log data from one that was 
early for a couple of days and then recovered.

Please keep your eyes open for glitches like that and/or don't bang your head 
against the wall trying to find the bug in your code if your GPS receiver has 
that bug.  We should probably collect a list.

Eric:  Would gpsd get confused if it was using 2 receivers and they differed 
by a second?

The times when it was early roughly matched the times when I was having 
troubles with gpsd.  I didn't take any notes, but I may be able to pull 
something out of log files.


There is another screwup that has been observed.  The HP GPSDOs say the leap 
will happen at the end of March rather than the end of June.




-- 
These are my opinions.  I hate spam.






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