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<DIV dir=ltr align=left><SPAN class=836204916-05072010><FONT face=Arial
color=#0000ff size=2>Greg,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=836204916-05072010><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=836204916-05072010><FONT face=Arial
color=#0000ff size=2>I have to check if we can provide files representative of
workplan uploads</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=836204916-05072010><FONT face=Arial
color=#0000ff size=2></FONT></SPAN> </DIV>
<DIV dir=ltr align=left><SPAN class=836204916-05072010><FONT face=Arial
color=#0000ff size=2>Best regards,</FONT></SPAN></DIV>
<DIV dir=ltr align=left><SPAN class=836204916-05072010><FONT face=Arial
color=#0000ff size=2>Gilles</FONT></SPAN></DIV>
<DIV> </DIV><!-- Converted from text/rtf format -->
<P><SPAN lang=fr><FONT face=Arial size=2>Gilles MOURY</FONT></SPAN> <BR><SPAN
lang=fr><FONT face=Arial size=2>CNES Toulouse</FONT></SPAN> </P>
<DIV> </DIV><BR>
<DIV class=OutlookMessageHeader lang=fr dir=ltr align=left>
<HR tabIndex=-1>
<FONT face=Tahoma size=2><B>De :</B> Kazz, Greg J (313B)
[mailto:greg.j.kazz@jpl.nasa.gov] <BR><B>Envoyé :</B> mercredi 30 juin 2010
19:00<BR><B>À :</B> Moury Gilles; sls-ngu@mailman.ccsds.org;
sls-hru@mailman.ccsds.org<BR><B>Cc :</B> Gian.Paolo.Calzolari@esa.int;
jean-luc.gerner@esa.int<BR><B>Objet :</B> RE: [Sls-ngu] Consideration of
data compression as a topic for discussion in NGU meeting<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV class=WordSection1>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Gilles,<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">D’accord. In particular your
last suggestion. <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">I am working with Aaron Kiely to
examine how we can move this forward before the London
meeting.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">By the way, I can provide a
representative flight software load binary file from the MSL mission for
evaluation.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d">Can you provide some
representative uplink data sets from CNES for this
evaluation?<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,<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">Greg<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN style="COLOR: #1f497d"><o:p> </o:p></SPAN></P>
<DIV>
<DIV
style="BORDER-RIGHT: medium none; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; PADDING-LEFT: 0in; PADDING-BOTTOM: 0in; BORDER-LEFT: medium none; PADDING-TOP: 3pt; BORDER-BOTTOM: medium none">
<P class=MsoNormal><B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">From:</SPAN></B><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'"> Moury Gilles
[mailto:gilles.moury@cnes.fr] <BR><B>Sent:</B> Wednesday, June 30, 2010 9:33
AM<BR><B>To:</B> Kazz, Greg J (313B); sls-ngu@mailman.ccsds.org;
sls-hru@mailman.ccsds.org<BR><B>Cc:</B> Gian.Paolo.Calzolari@esa.int;
jean-luc.gerner@esa.int<BR><B>Subject:</B> RE: [Sls-ngu] Consideration of data
compression as a topic for discussion in NGU
meeting<o:p></o:p></SPAN></P></DIV></DIV>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Greg,</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Indeed
compression is being used on the uplink when data rate / pass duration are not
sufficient to upload a work plan (for example). On our LEO earth observation
spacecrafts, we often use what we call "macrocommands" to actually encode the
daily work plan so that it can be uploaded in one single pass at 2 or 4 kbps.
This macrocommand syntax is a way of compressing work plans or sequences of
commands by encoding with one single macrocommand a complete Operational Control
Procedure. This type of compression is of course highly mission dependent and
cannot be subject to standardization. Nevertheless, it is very
efficient.</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">On the
contrary, a generic standard lossless compression for S/C uploads could be
envisaged derived from a mainstream universal lossless compression algorithm
like LZ (deflate RFC). This approach is interesting if a single algorithm
(with reasonable decoding complexity) provides significant and consistent
performances (2:1 compression ratio on average at least) for a wide range of
uploads types (work plans, software uploads, FPGA configuration uploads,
parameter tables uploads (e.g. star catalogues), ...).</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">The
first step would be to assemble a set of representative uploads covering the
whole range of type of traffic on TC links, and then perform performance test
with LZ. This initial step is necessary to decide on agency interest for such a
TC compression CCSDS standard.</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Discussion
with MHDC WG before next meeting could be beneficial to assess their capability
to support this first step, and to gather their technical opinion on the
opportunity/feasibility of such a standardization.</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Best
regards,</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: 'Arial','sans-serif'">Gilles</SPAN><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <o:p></o:p></SPAN></P></DIV>
<P><SPAN lang=FR
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">Gilles MOURY</SPAN>
<BR><SPAN lang=FR
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Arial','sans-serif'">CNES
Toulouse</SPAN><SPAN lang=FR> </SPAN><o:p></o:p></P>
<DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"> <o:p></o:p></SPAN></P></DIV>
<P class=MsoNormal><SPAN
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p> </o:p></SPAN></P>
<DIV class=MsoNormal style="TEXT-ALIGN: center" align=center><SPAN lang=FR
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'">
<HR align=center width="100%" SIZE=2>
</SPAN></DIV>
<P class=MsoNormal style="MARGIN-BOTTOM: 12pt"><B><SPAN lang=FR
style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">De :</SPAN></B><SPAN
lang=FR style="FONT-SIZE: 10pt; FONT-FAMILY: 'Tahoma','sans-serif'">
sls-ngu-bounces@mailman.ccsds.org [mailto:sls-ngu-bounces@mailman.ccsds.org]
<B>De la part de</B> Kazz, Greg J (313B)<BR><B>Envoyé :</B> mardi 29 juin
2010 00:57<BR><B>À :</B> sls-ngu@mailman.ccsds.org;
sls-hru@mailman.ccsds.org<BR><B>Cc :</B>
Gian.Paolo.Calzolari@esa.int<BR><B>Objet :</B> [Sls-ngu] Consideration of
data compression as a topic for discussion in NGU meeting</SPAN><SPAN lang=FR
style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman','serif'"><o:p></o:p></SPAN></P>
<P class=MsoNormal>All,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Please let me know if you would be interested in having a
discussion on the use of data compression as a technique towards conserving
bandwidth on the uplink.<o:p></o:p></P>
<P class=MsoNormal>In other words, do you think compression is likely to be a
big payoff and manageable, and worthy of inclusion in a CCSDS NGU standard, etc.
?<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>A current example of using compression on the uplink is the
NASA Mars Science Laboratory Project which is tentatively planning to use one of
the Lempel Ziv (LZ) encoders for compressing flight software loads.
<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Data compression could be another technique that the NGU WG
should consider for standardization for NGU applications. Considering that the
CCSDS Convolutional Code can approximately provide about a 5 db gain, and the
LDPC about 7 db. if we can get 3+ db from compression it might be a
worthwhile contender for consideration.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>So this additional work could manifest itself by involving
agency collaboration on studying the various compression candidates for use on
the uplink. If that is the case, then NGU would need support from the MHDC WG in
supporting such a study.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Some of the question we could consider asking ourselves
are:<o:p></o:p></P>
<P class=MsoNormal> <o:p></o:p></P>
<P class=MsoNormal>(1) Can we come up with uplink data sets that are good
examples of the type of uplink data that requires compression and that
compresses well?<o:p></o:p></P>
<P class=MsoNormal>(2) How much improvement might we get from different
variations of compression algorithms on the data types that are worth studying
?<o:p></o:p></P>
<P class=MsoNormal>(3) Have we convinced ourselves that the NGU data volume
problem is significant enough in the first place to warrant compression
?<o:p></o:p></P>
<P class=MsoNormal>(4) Is 2:1 lossless compression our goal ?<o:p></o:p></P>
<P class=MsoNormal>(5) What are the candidate compression algorithms and what
are the metrics to judge them by ?<o:p></o:p></P>
<P class=MsoNormal>(6) I don't know how much interest there is from other CCSDS
member agencies on this topic <SPAN
style="FONT-FAMILY: 'Times New Roman','serif'">–</SPAN> please let me
know.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>If I get positive feedback from member agencies on this
survey, then I will pass this along to the MHDC WG to see if we can start up an
email dialog with them before the London meeting and also schedule some time in
London if necessary to meet with them.<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Best regards,<o:p></o:p></P>
<P class=MsoNormal><o:p> </o:p></P>
<P class=MsoNormal>Greg Kazz<o:p></o:p></P>
<P class=MsoNormal>Chairman CCSDS NGU WG
<o:p></o:p></P></DIV></BODY></HTML>