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<p class="MsoNormal"><span style="color:#1F497D">It just occurred to me that some of our newer WG members may have never read the Concept Green Book for version 1 SCCS-SM,
</span><b><i><span style="font-size:9.0pt;font-family:"Verdana","sans-serif";color:green;background:white">Space Communication Cross Support—Service Management—Operations Concept</span></i></b><span style="color:#1F497D"> (<a href="http://public.ccsds.org/publications/archive/910x14g1.pdf">http://public.ccsds.org/publications/archive/910x14g1.pdf</a>).
Section 3.7 of that Green Book lays out the various use cases and scenarios for trajectory predictions, and provides the background for the presence and use of the various parameters of the Trajectory Prediction operation. I think that this is very useful
reading to understand how the Blue-1 TP operations (which are our starting point for the current work in this area) came into being. (I’m a bit embarrassed that I had not thought to mention this book sooner.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">John<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> smwg-bounces@mailman.ccsds.org [mailto:smwg-bounces@mailman.ccsds.org]
<b>On Behalf Of </b>Barkley, Erik J (3970)<br>
<b>Sent:</b> Thursday, August 07, 2014 8:07 PM<br>
<b>To:</b> Reinert, Jessica M (312G-NASA)<br>
<b>Cc:</b> CCSDS Service Mgmt WG<br>
<b>Subject:</b> RE: [Smwg] Draft Presentation for the Trajectory Prediction Data Format Recommended Standard<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">Jessica,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks for putting the first draft/cut together of the presentation. A couple of comments that may help to answer some of your questions:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">1)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">The business about existing trajectory reference and new trajectory reference have to do with the apply-new-trajectory operation in the current 1 specification. And in fact those were operations related to the application
of a new trajectory to a service package -- i.e., they are service package related items and really not trajectory related items. For the purpose of developing an extensible specification with regard to handling input of trajectory predictions I think then
that this kind of stuff can be safely omitted from a the future trajectory prediction book. It seems like it will have to be dealt with by the service package request book. (But let’s see what the WG has to say.)
<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="text-indent:-.25in"><span style="color:#1F497D">2)</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">It strikes me that there probably are two main aspects for extensibility with regard to trajectory predictions. The first one, which I think is the easiest to deal with, is with regard to allowing different formats to be specified.
So in that regard the bilateral format definition probably stays in here and is part of a general extension point with regard to expressing data formats. The other extensibility point is more about the implied usage of the trajectory data. I think there are
two sub-cases here:<o:p></o:p></span></p>
<p class="MsoListParagraph"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in"><span style="color:#1F497D">a.</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">The extended trajectory prediction operation in the current blue-1. This may indeed need more of an examination/cross-check as perhaps it goes away since we are not doing a trajectory prediction handling service. Then again
we may need something in here to at least indicate the relationship of the information even though we don't really state how you do the extension (good discussion for the working group I think).
<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in"><span style="color:#1F497D">b.</span><span style="font-size:7.0pt;font-family:"Times New Roman","serif";color:#1F497D">
</span><span style="color:#1F497D">The other sub-case is where bits and pieces of trajectories are "layered" to achieve an effective/net trajectory prediction. The classic example here is a mission or a flight dynamics operation that will tell you what the
spacecraft trajectory is relative to a satellite/moon of a planet and another trajectory segment will tell you the orbit of the moon to the planet and another trajectory segment will tell you the orbit of the planet with regard to the solar system barycenter
such that you can finally figure out where it is you really point your antenna, etc. I think this is likely to be good extension point from a data format perspective.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">-Erik<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> <a href="mailto:smwg-bounces@mailman.ccsds.org">
smwg-bounces@mailman.ccsds.org</a> [<a href="mailto:smwg-bounces@mailman.ccsds.org">mailto:smwg-bounces@mailman.ccsds.org</a>]
<b>On Behalf Of </b>Reinert, Jessica Mae (GRC-LSA0)<br>
<b>Sent:</b> Tuesday, August 05, 2014 8:38 PM<br>
<b>To:</b> CCSDS Service Mgmt WG<br>
<b>Subject:</b> [Smwg] Draft Presentation for the Trajectory Prediction Data Format Recommended Standard<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Greetings,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">It’s a bit tardy, but here’s my first cut at the draft materials for the Trajectory Prediction Data Format Recommended Standard. I ended up having quite a few questions, and made notes of a lot of them right on the UML diagram that was
generated. I also included a few on a separate slide. I look forward to getting your feedback on the attached materials.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Jessica<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt;color:#1F497D">Jessica Reinert<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Systems Definition and Communications Branch<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">NASA Glenn Research Center<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Phone: 216-433-6249<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Times New Roman","serif";color:black;background:white"><br>
<a href="https://filter.gst.com/canit/b.php?i=01MA0fR0P&m=654b918650ee&c=s" target="canit_note">Spam</a><br>
<a href="https://filter.gst.com/canit/b.php?i=01MA0fR0P&m=654b918650ee&c=n" target="canit_note">Not spam</a><br>
<a href="https://filter.gst.com/canit/b.php?i=01MA0fR0P&m=654b918650ee&c=f" target="canit_note">Forget previous vote</a></span><span style="font-size:12.0pt;font-family:"Times New Roman","serif""><o:p></o:p></span></p>
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