[Sis-csi] RF aspects of Cislunar

[James L. Rash]

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
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