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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier">All:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier">I am dutifully passing this message on per the request of our Area Director. However, attending this BOF may pull WG members away from our core work depending on how meetings are scheduled.
Please take these things into consideration.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:Courier">David<o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">"Mario.Merri@esa.int" <Mario.Merri@esa.int><br>
<b>Date: </b>Tuesday, October 23, 2018 at 2:46 AM<br>
<b>To: </b>"Berry, David S (3920)" <David.S.Berry@jpl.nasa.gov>, "Frank.Dreger@esa.int" <Frank.Dreger@esa.int>, "danford.s.smith@nasa.gov" <danford.s.smith@nasa.gov>, "sam@brightascension.com" <sam@brightascension.com><br>
<b>Cc: </b>"moims@mailman.ccsds.org" <moims@mailman.ccsds.org><br>
<b>Subject: </b>[Cesg-all] FW: [Sea-time] Notes from CCSDS Systems Engineering Area (SEA) Time Birds of a Feather (BoF) meeting, 17 Oct 18<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif">Dear NAV and SM&C leads,</span>
<br>
<br>
<span style="font-family:"Arial",sans-serif">I believe that your WGs should be in sync with this endeavour. Please make sure to participate at the next opportunity.</span>
<br>
<br>
<span style="font-family:"Arial",sans-serif">Regards,</span> <br>
<br>
<span style="font-family:"Arial",sans-serif">__Mario</span> <br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:purple">----- Forwarded by Mario Merri/esoc/ESA on 23/10/2018 11:43 -----</span>
<br>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">From: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"Shames, Peter M (312B)" <Peter.M.Shames@jpl.nasa.gov></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">To: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">CCSDS Engineering Steering Group - CESG All <cesg-all@mailman.ccsds.org></span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Date: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">23/10/2018 11:40</span>
<br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Subject: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">[Cesg-all] FW: [Sea-time] Notes from CCSDS Systems Engineering Area (SEA) Time Birds of a Feather
(BoF) meeting, 17 Oct 18</span> <br>
<span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#5F5F5F">Sent by: </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif">"CESG-All" <cesg-all-bounces@mailman.ccsds.org></span>
<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">Dear CCSDS AD and WG chairs,<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">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.<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">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.<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">Thanks, Peter<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><b><span style="font-size:12.0pt">From:
</span></b><span style="font-size:12.0pt">SEA-TIME <sea-time-bounces@mailman.ccsds.org> on behalf of Peter Shames <Peter.M.Shames@jpl.nasa.gov><b><br>
Date: </b>Tuesday, October 23, 2018 at 2:27 AM<b><br>
To: </b>"Sanchez, Erika A." <Erika.Sanchez@jhuapl.edu>, "Birrane, Edward J." <Edward.Birrane@jhuapl.edu>, "Colin.Haddow@esa.int" <Colin.Haddow@esa.int>, Jon Hamkins <Jon.Hamkins@jpl.nasa.gov>, Victor Sank <victor.j.sank@nasa.gov>, Keith Scott <kscott@mitre.org>,
Holger Dreihahn/esoc/ESA <Holger.Dreihahn@esa.int>, "Pitts, Robert L. (MSFC-HP27)[HOSC SERVICES CONTRACT]" <robert.l.pitts@nasa.gov>, "osvaldo.peinado@dlr.de" <osvaldo.peinado@dlr.de><b><br>
Cc: </b>"sea-time@mailman.ccsds.org" <sea-time@mailman.ccsds.org><b><br>
Subject: </b>[Sea-time] Notes from CCSDS Systems Engineering Area (SEA) Time Birds of a Feather (BoF) meeting, 17 Oct 18</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">Dear Time BoF colleagues,<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">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:<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><a href="https://mailman.ccsds.org/cgi-bin/mailman/listinfo/sea-time"><span style="color:#0082BF">https://mailman.ccsds.org/cgi-bin/mailman/listinfo/sea-time</span></a><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">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 <b><i>real</i></b> work will begin. <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">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.<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><a href="https://doodle.com/poll/4vrex3wxv6cmbfdr">https://doodle.com/poll/4vrex3wxv6cmbfdr</a><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">You can find the old materials from the original Time BoF here:<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><a href="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">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</a><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">I will ask the Secretariat to reinstate the SEA-Time as an active BoF.<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">Thanks for the support, Peter<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><b>Time BoF - 17 Oct 18</b><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt">Attendees: Erika Sanchez, Ed Birrane, Colin Haddow, Jon Hamkins, Victor Sank, Keith Scott, Holger Driehahn<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:Symbol">·
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span>Three basic topics to be addressed (time stamp, time exchange, time correlation)<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:Symbol">·
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span>Discussion about what is now being done. Most missions do this now …<span style="font-size:12.0pt">
</span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>time representation (time code)<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>time stamp (clock format)<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>time exchange via SPP header (in some form) or mission specific<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>Earth Receive Time (ERT) from ground station, typically via SLE<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>Mission specific time correlation and management of on-board clocks (or not)<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:Symbol">·
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span>Discussion of issues and similarities<span style="font-size:12.0pt"> </span>
<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>time exchange is quite common across agencies<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>time correlation is challenging, especially at higher levels of accuracy<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>time synchronization may be workable at millisecond accuracies, but not higher<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>relativistic time issues<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:Symbol">·
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span>Use cases for time synchronization:<span style="font-size:12.0pt"> </span>
<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>orbit insertion<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>docking<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>robotic collaboration
<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>simultaneous operation<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>science observations<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>DTN time needs (order of seconds)<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>DTN time services for other users (higher precision)<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:Symbol">·
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span><span style="font-size:10.0pt"> </span><span style="font-size:10.0pt;font-family:Symbol">
</span>Next steps<span style="font-size:12.0pt"> </span><o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>Review notes, provide comments<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>Review draft Charter, suggest edits<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"><span style="font-size:10.0pt;font-family:"Courier New"">o </span>Schedule WebEx to make progress<o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p style="margin:0in;margin-bottom:.0001pt"> <o:p></o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
<tt><span style="font-size:10.0pt">_______________________________________________</span></tt><span style="font-size:10.0pt;font-family:"Courier New""><br>
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