[LEAPSECS] aircraft GPS receivers hit by leap second bug

Steve Allen sla at ucolick.org
Tue Jun 11 16:38:31 EDT 2019

On Tue 2019-06-11T13:33:44-0700 Paul Hirose hath writ:
> issued another letter to its user group, highlighting the exact problem: “We
> found that a software design error resulted in the system misinterpreting
> GPS time updates due to a ‘leap second’ event, which typically occurs once
> every 2.5 years within the U.S. Government GPS satellite almanac update. Our
> GPS-4000S-100 version software's timing calculations have reacted to this
> leap second by not tracking satellites upon power-up and subsequently
> failing. The U.S. Government distributed a regularly scheduled almanac
> update with this ‘leap second’ on 0:00GMT, Sunday, June 9, 2019, and the
> failures began to occur soon after.”

This is obscuration throwing blame where it does not belong.
Other models of GPS have had no problems.
Better reporters have indicated that that the manufacturer
issued a bad software update.

Steve Allen                    <sla at ucolick.org>              WGS-84 (GPS)
UCO/Lick Observatory--ISB 260  Natural Sciences II, Room 165  Lat  +36.99855
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