<span style=" font-size:10pt;font-family:sans-serif">Dear Peter,</span>
<br><span style=" font-size:10pt;font-family:sans-serif">
please find here</span><span style=" font-size:10pt;font-family:Arial">
a reply coordinated with SLS experts on the matter.</span><span style=" font-size:12pt;font-family:Times New Roman">
</span>
<br><span style=" font-size:10pt;font-family:Arial"><br>
1) Ranging is not affected by the coding schemes but rather by the used
modulations.</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
2) higher order modulations (HOMs) cannot be used with conventional
ranging or PN ranging per say. HOMs are used by 131.2-B, 131.3-B , and
431.0-B.</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
3) the 3 standards (131.2-B, 131.3-B , and 431.0-B) can be used with
telemetry ranging (that in turns need PN ranging uplink).</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
4) RF & Modulation standard 401.0-B includes (in addition to rec's
addressing PN ranging) two recommendations for ranging:</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
4a) one very generic recommendation from which ECSS ranging standard and
NASA deep space ranging standards are derived/allowed as a subset of transparent
ranging</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
4b) one recommendation on telemetry ranging. This recommendation
references PN ranging and It is based on PN ranging on the uplink with
PN regeneration on-board. This scheme is compatible with any downlink modulation
scheme</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
5) RF & Modulation standard 401.0-B includes also a recommendations
for Delta DOR transmission</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
6) Delta-DOR is affected by HOMs as conventional ranging or PN ranging.
[DDOR transmission as is today in 401 (update coming soon) requires "unmodulated"
tones and in some cases with a coherent ratio from the carrier. The easy
way to generate them is with a phase modulation of a residual carrier.
Again this is in principle against SCCC/DBV-S2/VCM a la NASA. However,
one can have a second transmitter to generate the tones that are then simply
mixed with the HOMs before the TWTA/SSPA.]</span><span style=" font-size:12pt;font-family:Times New Roman">
<br>
</span><span style=" font-size:10pt;font-family:Arial"><br>
Moreover, we are puzzled by the page with Table 6-10.</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
With respect to the draft Table we find quite a risk of ambiguity with
an (unneeded) wish of showing rough details that can easily be misinterpreted.</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
If there is the condition "IF RF Link" for PN Ranging, then (at
least) the condition "IF Optical Link" should be present for
optical ranging.</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
The table calls TD-CSTS i.e. "CCSDS 922.2-B-1 Cross Support
Transfer Service—Tracking Data Service, Recommended Standard, Issue 1"
(available at </span><a href=https://public.ccsds.org/Pubs/922x2b1.pdf><span style=" font-size:10pt;color:blue;font-family:Arial"><u>https://public.ccsds.org/Pubs/922x2b1.pdf</u></span></a><span style=" font-size:10pt;font-family:Arial">
)</span><span style=" font-size:12pt;font-family:Times New Roman"> </span><span style=" font-size:10pt;font-family:Arial"><br>
This document does not reference any ranging standard (even the 401.0)!
CCSDS 922.2-B-1 only references Tracking Data Message. Issue 2. Recommendation
for Space Data System Standards (Blue Book), CCSDS 503.0-B-2.(available
at </span><a href=https://public.ccsds.org/Pubs/503x0b2.pdf><span style=" font-size:10pt;color:blue;font-family:Arial"><u>https://public.ccsds.org/Pubs/503x0b2.pdf</u></span></a><span style=" font-size:10pt;font-family:Arial">
); i.e. TD-CSTS does not care on how the tracking data are produced.</span><span style=" font-size:12pt;font-family:Times New Roman">
</span><span style=" font-size:10pt;font-family:Arial"><br>
The reference to 401 is then ambiguous: does it refers to the 3 recommendations
mentioned above (bullets 4a, 4b, and 5)? <br>
it looks this should be remarked as well.</span><span style=" font-size:12pt;font-family:Times New Roman">
</span>
<br>
<br><span style=" font-size:10pt;font-family:Arial">Best regards</span>
<br>
<br><span style=" font-size:10pt;font-family:Arial">Gian Paolo</span>
<br>
<br>
<br>
<br>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">From:
</span><span style=" font-size:9pt;font-family:sans-serif">"Shames,
Peter M (US 312B)" <peter.m.shames@jpl.nasa.gov></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">To:
</span><span style=" font-size:9pt;font-family:sans-serif">"Gian
Paolo Calzolari" <Gian.Paolo.Calzolari@esa.int>, "SLS -
Space Link Services Area" <sls@mailman.ccsds.org></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Cc:
</span><span style=" font-size:9pt;font-family:sans-serif">"SEA-SA"
<sea-sa@mailman.ccsds.org></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Date:
</span><span style=" font-size:9pt;font-family:sans-serif">05-03-21
21:52</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">Do
SCCC and DVB-S2 also support Ranging and D-DOR?</span>
<br>
<hr noshade>
<br>
<br>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri">Gippo,
et al,</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri">In
the last SAWG discussion on the content to be revised in the SCCS-ARD the
question came up as to whether SCCC and DVB-S2 also support the traditional
ranging and D-DOR services.</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri">Can
you guys provide an answer for this? See attached draft of Table
6-10 space link radiometric services.</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> </span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri">Thanks,
Peter</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Calibri"> [attachment
"SCCS-ARD Table 6-10 Radiometric.pdf" deleted by Gian Paolo Calzolari/esoc/ESA]
</span></p>
<p style="margin-top:0px;margin-Bottom:0px"></p>
<p style="margin-top:0px;margin-Bottom:0px"></p>
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