[LEAPSECS] BBC radio Crowd Science
sla at ucolick.org
Wed Feb 1 17:45:15 EST 2017
On Wed 2017-02-01T14:27:03 -0800, Tom Van Baak hath writ:
> 6) clock sends TAI and -N, user wants UTC
> - 6a) clock must send N1 and N2 so that user can generate UTC in all cases, or
I recognize this as the model chosen by GPS, and documented in
IS-GPS-200. GPS also gives the epoch at which N2 supersedes N1.
We know GPS has up to 12 minutes where a cold start does not yet have
all that info, and even after that we have seen several reports of
hardware which failed to implement it correctly.
Steve Allen <sla at ucolick.org> WGS-84 (GPS)
UCO/Lick Observatory--ISB 260 Natural Sciences II, Room 165 Lat +36.99855
1156 High Street Voice: +1 831 459 3046 Lng -122.06015
Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m
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