[time-nuts] Faulty GPS SAT # 16 on Lady Heather

Henry Hallam henry at pericynthion.org
Thu Jul 29 21:43:04 EDT 2010


Yes, forecast downtime due to delta V maneuvering.  I believe it's
related to the reorganisation of the constellation from 21+3 to 24+3:
http://blogs.agi.com/navigationAccuracy/?p=315

Henry


On Thu, Jul 29, 2010 at 2:41 PM,  <bg at lysator.liu.se> wrote:
> It seems it is beeing moved.
>
> 56   16  Launched 29 JAN 2003; usable 18 FEB 2003; operating on Rb std
>           Scheduled unusable 29 Jul 1345 UT to 30 Jul 0145 UT for
>             repositioning maintenance (NANU 2010102)
>
> from   ftp://tycho.usno.navy.mil/pub/gps/gpstd.txt
>
> btw the Elmer Perkins Rb's beats most/all space CS out to a few days.
> Since the ground crew updates clock preditions every day, there is not
> that much need for the Cs _long_ term stability.
>
> --
>
>   Björn
>
>> Once again, one of the 8 received satellites (#16) delivers no
>> contribution to the time ensmble, although it got is over 40dbc
>> strength. Lady Heather (beta 3.00) shows a hollow circle in the diagram,
>> marked yellow in the list, and it has zero CLOCK BIAS and ACCU=0.
>>
>> Does anybody know, if that satellite is defect (e.g. Cs down), or if it
>> has a special task, i.e. military purposes only?
>>
>> Frank
>>
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>
>
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-- 
Henry Hallam

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