[IGSMAIL-6811] IGS timescales

[Ken Senior]

All,

 

The clocks in SVN62/PRN01, SVN63/PRN25, and SVN66/PRN27 were all given delta
drift offsets ranging from a few to ten parts in 10^19 s/s^2 on 17 July.
Because these satellite clocks are relatively very stable as compared to
other ground clocks they've been carrying ~5% weight in the ensemble
(excluding SVN66 which is still subject to rubidium start-up transient) for
both IGRT and IGST.  While bad data as well as most delta maneuvers and
delta clock changes are easy to detect and mitigate automatically in the
timescale algorithm, delta drift changes are much less so.  Therefore, since
17 July the timescales have suffered in stability and in UTC offset.  

 

To mitigate these effects in the future and to correct data since 17 July
I've implemented the ability to ingest known delta drift corrections from
2SOPS into the IGS timescales, including the three satellite deltas on 17
July.  The ACC will soon resubmit the Rapids and Finals since 17 July to
incorporate these corrections and update the relevant Clock RINEX and SP3
files.

 

Best regards,

 

Ken Senior

 

 

 


	


  Ken L. Senior 
  Advanced Space PNT
  Naval Center for Space Technology 

 

			

 


 


Naval Research Laboratory


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 <mailto:ken.senior at nrl.navy.mil> ken.senior at nrl.navy.mil

 

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