[Sea-time] Notes from CCSDS Systems Engineering Area (SEA) Time Birds of a Feather (BoF) meeting, 17 Oct 18

[Shames, Peter M (312B)]

Dear Time BoF colleagues,

What follows are my slightly edited notes from the SEA-Time BoF we held over lunch on 17 Oct 18.  I am sending them to those who were present at the meeting and also to the existing SEA-TIME mailing list.  If you are not already on this email list please go to:

https://mailman.ccsds.org/cgi-bin/mailman/listinfo/sea-time

and sign up.  This will give you access to any on-going discussions.  Keep in mind that this any BoF is a "pre-Working Group".  Its intended activities are to create a charter (plan of work) and a concept paper (description of what will be standardized) for a proposed CCSDS Working Group.  Once we have agreed on what we think should be done, created these two (rather modest) documents, and have identified sufficient resources to accomplish the work, we will petition to have the WG formalized.  Then the real work will begin.

We would like to have a telecon to continue forward momentum.  Please go to this Doodle Poll and indicate which of the proposed dates and times work best for you.  Please pick more than one and indicate yes, no, or "if need be".  Once we settle on a date I'll setup a WebEx and send it to the mailing list.  Please sign up if you wish to be a part of the on-going discussions.  Feel free to notify any colleagues who might wish to contribute.
https://doodle.com/poll/4vrex3wxv6cmbfdr

You can find the old materials from the original Time BoF here:
https://cwe.ccsds.org/sea/docs/Forms/AllItems.aspx?RootFolder=%2fsea%2fdocs%2fWork%20Completed%20%28Closed%20WGs%29%2fTime%20Code%20and%20Sync%20Birds%20of%20a%20Feather&FolderCTID=0x012000F83FD93BEFF45E4FB5D1769B01CA762F

I will ask the Secretariat to reinstate the SEA-Time as an active BoF.

Thanks for the support, Peter



Time BoF - 17 Oct 18
Attendees: Erika Sanchez, Ed Birrane, Colin Haddow, Jon Hamkins, Victor Sank, Keith Scott, Holger Driehahn

  *   Three basic topics to be addressed (time stamp, time exchange, time correlation)
  *   Discussion about what is now being done.  Most missions do this now …
     *   time representation (time code)
     *   time stamp (clock format)
     *   time exchange via SPP header (in some form) or mission specific
     *   Earth Receive Time (ERT) from ground station, typically via SLE
     *   Mission specific time correlation and management of on-board clocks (or not)
  *   Discussion of issues and similarities
     *   time exchange is quite common across agencies
     *   time correlation is challenging, especially at higher levels of accuracy
     *   time synchronization may be workable at millisecond accuracies, but not higher
     *   relativistic time issues
  *   Use cases for time synchronization:
     *   orbit insertion
     *   docking
     *   robotic collaboration
     *   simultaneous operation
     *   science observations
     *   DTN time needs (order of seconds)
     *   DTN time services for other users (higher precision)
  *   Next steps
     *   Review notes, provide comments
     *   Review draft Charter, suggest edits
     *   Schedule WebEx to make progress


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