[LEAPSECS] BBC radio Crowd Science

Steve Allen 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

More information about the LEAPSECS mailing list