[time-nuts] Problem behind failing Galileo clocks identified

Tom Van Baak tvb at LeapSecond.com
Sun Jul 23 08:41:32 EDT 2017

> http://galileognss.eu/problem-behind-failing-clocks-identified/
> http://galileognss.eu/atomic-clocks-failures-onboard-galileo-satellites/
> My guess.

Perhaps a time nut will eventually find and share a technical paper with all the details.
Meanwhile, let's not use time-nuts as a public guessing forum.

Some background on the Galileo clocks, including photos and ADEV plots:

"The Onboard Galileo Rubidium and Passive Maser, Status & Performance"

"Space Passive Hydrogen Maser Performances, lifetime data and GIOVE-B related telemetries"

"Synchronizing 30 navigation satellites within 1 ns"

"Latest & future Evolutions on Atomic Clocks for Global Navigation Satellites"
[ 04_28 September - Session 6 - Panel 6.1 - Pascal Rochat, Spectratime.pdf ]

If anyone has additional technical links to Rb and PHM clocks used for GNSS, feel free to post links.


----- Original Message ----- 
From: "paul swed" <paulswedb at gmail.com>
To: "David J Taylor" <david-taylor at blueyonder.co.uk>; "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
Sent: Saturday, July 22, 2017 12:45 PM
Subject: Re: [time-nuts] Problem behind failing Galileo clocks identified

> Hmmm Tantalum caps perhaps. My guess.
> But really no details. Curious though.
> Regards
> Paul
> On Sat, Jul 22, 2017 at 3:10 PM, David J Taylor via time-nuts <
> time-nuts at febo.com> wrote:
>> "Investigators have uncovered the problems behind the failure of atomic
>> clocks onboard Galileo satellites, the European Commission said."  See:
>>  http://galileognss.eu/problem-behind-failing-clocks-identified/
>> May be of some interest.
>> Cheers,
>> David

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