Hi again,one of my colleagues has a u-blox LEA M8T with firmware 3.01 available, and this morning, the device has output the following fields in the UBX-NAV_TIMELS message:
iTOW 118812000 Time Of Week [ms]
srcOfCurrLs 2 Source of Leap Second Info
(2 -> GPS)
currLs 18 Current GPS/UTC offset [s]
srcOfLsChange 2 Source of Leap Second Change Info
(2 -> GPS)
lsChange 0 Future Leap Second, if scheduled
(0 -> none scheduled)
timetoLsEvent 767606 Time To Next Leap Second Event [s]
(counting down in subsequent messages)
dateOfLsGpsWn 2185 [extended] GPS week number of the nearest
leap second
dateOfLsGpsDn 7 GPS day of week number for the nearest
leap second
valid 0x03 Validity flags (0x03 -> both currLs and
timetoLsEvent are valid)
GPS LS week number 2185 and day number 7 would indicate a leap second
scheduled for the end of Sat, 2021-11-27. This must be wrong because
2021-11-27 is not the end of June or December, but the wrong expanded
week number is probably just due to the ambiguity of the truncated 8 bit
week number in the UTC parameter set.
The current GPS time when this message was received was WN 2168 and TOW 118812.
According to timetoLsEvent, the next LS would be 767606 s in the future, which would be around WN 2168 TOW 886418, which would be normalized to WN 2169 and TOW 281618, which in turn means around 6 AM on 2021-08-04, which is obviously not plausible, either. And it differs from the other wrong date indicated by WN 2185 DN 7.So the output is not consistent, specifically since timetoLsEvent is continuously counting down.
On the other hand, the field lsChange is 0, which means there is no leap second pending at all, and thus there's no need to evaluate the other fields to generate a leap second warning to other applications.
Martin -- Martin Burnicki Senior Software Engineer MEINBERG Funkuhren GmbH & Co. KG Email: martin.burni...@meinberg.de Phone: +49 5281 9309-414 Linkedin: https://www.linkedin.com/in/martinburnicki/ Lange Wand 9, 31812 Bad Pyrmont, Germany Amtsgericht Hannover 17HRA 100322Geschäftsführer/Managing Directors: Günter Meinberg, Werner Meinberg, Andre Hartmann, Heiko Gerstung
Websites: https://www.meinberg.de https://www.meinbergglobal.com Training: https://www.meinberg.academy
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