[time-nuts] Re: Ublox messages before/after leap second event

[Markus Kleinhenz]

Hi HÃ¥kan,

> https://www.maths.tcd.ie/~dwmalone/time/leap2016/#nmea

has a NMEA recording from an MAX-M8q from 2016.

As for UBX-NAV-TIMELS:

Are you talking about the field 'timeToLsEvent'?

As the NMEA shows u-blox counting to second 60 I would assume it working
like this:

11:59:58 timeToLsEvent=+2
11:59:59 timeToLsEvent=+1
11:59:60 timeToLsEvent=0
00:00:00 timeToLsEvent=-1
00:00:01 timeToLsEvent=-2

Or for negative leap seconds:

11:59:58 timeToLsEvent=+1
00:00:00 timeToLsEvent=-1

But these are only educated guesses.


Regards,
Markus


Am 26.07.2023 um 19:21 schrieb HÃ¥kan T Johansson via time-nuts:
> 
> Hi,
> 
> I am looking for a dump of Ublox GPS messages at or around a leap second
> event.  Was a while since the last...
> 
> In particular the message UBX-NAV-TIMELS (b5 62 01 26) which contains
> leap upcoming leap second info, and the seconds to/since the event.  To
> know which second is considered as the '0' for the indicator in the
> message.
> 
> Just NMEA messages around a leap second event would be intresting too.
> 
> This is for my FPGA GPS/NTP project.
> 
> Cheers,
> HÃ¥kan
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