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

Tue Oct 23 09:46:16 UTC 2018

Dear NAV and SM&C leads,

I believe that your WGs should be in sync with this endeavour. Please make 
sure to participate at the next opportunity.

Regards,

__Mario
----- Forwarded by Mario Merri/esoc/ESA on 23/10/2018 11:43 -----

From:   "Shames, Peter M (312B)" <Peter.M.Shames at jpl.nasa.gov>
To:     CCSDS Engineering Steering Group - CESG All 
<cesg-all at mailman.ccsds.org>
Date:   23/10/2018 11:40
Subject:        [Cesg-all] FW: [Sea-time] Notes from CCSDS Systems 
Engineering Area (SEA) Time Birds of a Feather (BoF) meeting, 17 Oct 18
Sent by:        "CESG-All" <cesg-all-bounces at mailman.ccsds.org>

Dear CCSDS AD and WG chairs,

During last week's working meetings we held a short meeting to explore 
restarting the Time BoF.  Minutes from that are attached.  Please inform 
members of your WGs, and your agencies, that this work is again being 
considered as a new Working Group.   It should quickly become clear that 
this effort will touch, in one way or another, every CCSDS area of work.

The appended email will provide links to the data and the mailing list. 
Feel free to sign up or to pass the info on to any colleagues who may have 
an interest.

Thanks, Peter

From: SEA-TIME <sea-time-bounces at mailman.ccsds.org> on behalf of Peter 
Shames <Peter.M.Shames at jpl.nasa.gov>
Date: Tuesday, October 23, 2018 at 2:27 AM
To: "Sanchez, Erika A." <Erika.Sanchez at jhuapl.edu>, "Birrane, Edward J." 
<Edward.Birrane at jhuapl.edu>, "Colin.Haddow at esa.int" 
<Colin.Haddow at esa.int>, Jon Hamkins <Jon.Hamkins at jpl.nasa.gov>, Victor 
Sank <victor.j.sank at nasa.gov>, Keith Scott <kscott at mitre.org>, Holger 
Dreihahn/esoc/ESA <Holger.Dreihahn at esa.int>, "Pitts, Robert L. 
(MSFC-HP27)[HOSC SERVICES CONTRACT]" <robert.l.pitts at nasa.gov>, 
"osvaldo.peinado at dlr.de" <osvaldo.peinado at dlr.de>
Cc: "sea-time at mailman.ccsds.org" <sea-time at mailman.ccsds.org>
Subject: [Sea-time] Notes from CCSDS Systems Engineering Area (SEA) Time 
Birds of a Feather (BoF) meeting, 17 Oct 18

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

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