[time-nuts] FYI: Galileo satellite recovered and transmitting navigation signals

Bob Camp kb8tq at n1k.org
Sat Dec 6 08:39:25 EST 2014


Hi


> On Dec 6, 2014, at 3:09 AM, Attila Kinali <attila at kinali.ch> wrote:
> 
> On Fri, 5 Dec 2014 21:16:14 -0500
> Bob Camp <kb8tq at n1k.org> wrote:
> 
>> Running one locked to each system is really the only approach that makes
>> sense. There inevitably are minor differences in systems and trying to
>> average things out is not the best way to do it.
> 
> Might or might not be. At least for GPS and Galileo there is an agreement
> to synchronize the clocks and have a field in the message data that specifies
> the difference between UTC(GPS) and UTC(Galileo). 

Which would help a bit for timing in this case. 

> 
> There was some discussion at last EFTF about how they are going to measure
> the time difference accurately. Apparently the GPS people were not impressed
> by Galileos plan to have a physical realization of UTC(Galileo). They seem to
> have run into problems in the past and have thus switched to a paper clock.

It’s the coordination part that gets “interesting”. It requires more effort on both ends than one might think. Without getting into politics, that might be less practical with some of the other systems. 

Bob 

> 
> 
> 				Attila Kinali
> -- 
> I pity people who can't find laughter or at least some bit of amusement in
> the little doings of the day. I believe I could find something ridiculous
> even in the saddest moment, if necessary. It has nothing to do with being
> superficial. It's a matter of joy in life.
> 			-- Sophie Scholl
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