[Sis-csi] RF aspects of Cislunar

[Dave Israel]

All,

There is a new IP-over-CCSDS BoF in formulation that will address how IP is to
be transmitted over CCSDS lower layers.  I believe that will be the place for
these discussions about the lower layers.  This Cislunar working group should
be focused more on IP and above.

Dave

Quoting "James L. Rash" <James.L.Rash at nasa.gov>:

> All,
>
> This group will define a number of communication scenarios.  These
> scenarios would imply certain requirements on the lower layers.
> Could we determine or at least characterize those requirements?
>
> Jim
>
>
> At 12:59 AM -0400 6/2/05, Keith Hogie wrote:
> >All,
> >
> >   As we are drawing diagrams of all these communication scenarios,
> >I was wondering if the group plans on addressing lower layer issues
> >like frequencies, modulation, coding, and framing.  By following
> >a layered approach, lots of work can be done at upper layers while
> >ignoring details of the lower layers.  But, at some point we need
> >lower layer radios and RF technologies that can support all sorts of
> >dynamic links between all our CEVs, rovers, astronauts, relay
> >satellites, ISS, ground, etc.
> >
> >   Today's space communication systems tend to treat lots of
> >satellite communication as 2 one-way links with different solutions
> >in each direction (telemetry down, commands up).  That's fine for
> >a spacecraft that always talks to ground stations but it doesn't
> >work when you try to have any node communicate with any other node.
> >
> >   I was just wondering if this group should be looking at low level
> >RF link solutions as well as upper layers.
> >
> >----------------------------------------------------------------------
> >   Keith Hogie                   e-mail: hogie at ipinspace.gsfc.nasa.gov
> >   Computer Sciences Corp.       office: 301-794-2999  fax: 301-794-9480
> >   7700 Hubble Dr.
> >   Lanham-Seabrook, MD 20706  USA        301-286-3203 @ NASA/Goddard
> >----------------------------------------------------------------------
> >
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>
>
> --
>
> James L. Rash
> Building 23, Room E403
> Code 588 -- Advanced Architectures and Automation Branch
> NASA Goddard Space Flight Center
> Greenbelt, MD  20771
> 301-286-5246 (voice)     301-286-1768 (fax)
>
>
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______________________________________________________________
Dave Israel
Leader, Advanced Technology Development Group
Microwave & Communication Systems Branch
NASA Goddard Space Flight Center  Code 567.3
Greenbelt, MD 20771
Phone: (301) 286-5294      Fax:   (301) 286-1769
E-mail: david.j.israel at nasa.gov

"Without deviation from the norm, progress is not possible."  -Frank Zappa