[time-nuts] Galileo Service Outage Update

[Mark Sims]

My F9T started tracking Galileo sats at 19:22:10 UTC
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Re: [time-nuts] Galileo Service Outage Update

[Pete Stephenson]

On Mon, Jul 15, 2019, at 6:01 AM, Chris Burford wrote:
> Here is an update from EGSA on the continued outage of navigation and 
> timing services for the Galileo constellation:
> 
> https://www.gsc-europa.eu/news/update-on-the-availability-of-some-galileo-initial-services
> 
> As of now the service outage is at T+ 105.5 hours.

It looks like they're finally working things out: up until a few hours ago my 
u-blox M8T reported that all the Galileo satellites weren't usable due to 
having bad ephemerides, which tracks with what the various media has been 
reporting. 

A few hours ago I've been able to get usable locks on several Galileo 
satellites that have fresh, valid ephemerides, even those the constellation 
status page has everything marked as "NOT USABLE". 

Oddly, during the whole outage nearly all satellites were marked as healthy but 
had out of date ephemerides. Now I'm seeing at least one, E33, that's marked as 
unhealthy in the nav message but which has a valid ephemeris. It's not listed 
on the constellation status page as being part of the two "testing" satellites 
(E18 and E14, which are marked as unhealthy) but is marked as "NOT USABLE" 
along with the rest. 

It'll be really interesting to see what went wrong and what needed to be done 
to get things working again. I hope they make that report public. 

Cheers! 
-Pete

-- 
Pete Stephenson

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[time-nuts] PRS10 calibration

[Chris Burford]

I have been digging through the TN archives and came across a post dated 
May 2, 2012 having to do with the calibration of the PRS10 RFS.


In reading this it appears to be a process of stepping through the 
various time constant (PT) values during the discipline process and 
monitoring the time tag values being as close to 0ns for ideal results.


My questions are these:

 * Is there a quicker way to individually step through the PT values
   and is it possible to use every other PT value when calibrating?
   When all is said and done a total of 61+ cumulative hours is
   required given the expiration of each natural time constant setting.
 * Should the time offset value (TO) also be adjusted in conjunction
   with each successive increment of the time constant?
 * Are there any other adjustments to be made during the calibration
   process?

Thanks,

Chris


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