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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Please see the information below provided by Faramaz, to be possibly taken into consideration when preparing S-Band proxy-1 related inputs for the C&S meeting jointly with SLP and
RFM.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US">Regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#00A1E0">Ph.D. Andrea Modenini</span></b><b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:gray"><br>
TT&C Communications Systems Engineer</span></b><b><span style="font-family:"Tms Rmn",serif"> </span></b><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:gray"><br>
TT&C and PDT Systems & Techniques Section (TEC-EST)<br>
RF Systems Division<b><br>
European Space Agency, ESTEC</b><br>
Keplerlaan 1, PO Box 299<br>
NL-2200 AG Noordwijk, The Netherlands</span><u><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:blue"><br>
</span></u><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:gray"><a href="mailto:andrea.modenini@esa.int"><span style="color:blue">andrea.modenini@esa.int</span></a> |
</span><span style="font-size:11.0pt"><a href="http://www.esa.int/"><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:#8F8F8F">www.esa.int</span></a></span><span style="font-size:7.5pt;font-family:"Verdana",sans-serif;color:gray"><br>
T +31 71 56 53439, M +31 6 484 56 527</span><span style="font-size:11.0pt"> <o:p>
</o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt">From:</span></b><span lang="EN-US" style="font-size:11.0pt"> Davarian, Faramaz (US 9700) <faramaz.davarian@jpl.nasa.gov>
<br>
<b>Sent:</b> 22 March 2023 19:40<br>
<b>To:</b> Andrea Modenini <Andrea.Modenini@esa.int>; Kazz, Greg (US 312B) <greg.j.kazz@jpl.nasa.gov>; Lee, Dennis K (US 332G) <dennis.k.lee@jpl.nasa.gov>; Andrews, Kenneth S (US 332B) <kenneth.s.andrews@jpl.nasa.gov><br>
<b>Cc:</b> Fadl, Ahmed M. (GSFC-8500) <ahmed.m.fadl@nasa.gov>; Ben Schwarz <BSchwarz@sstl.co.uk>; Charles Cranstoun <CCranstoun@sstl.co.uk>; Ashvi Ilott <AIlott@sstl.co.uk>; Stuart Golden <sgolden@vulcanwireless.com>; Kevin Lynaugh <klynaugh@vulcanwireless.com>;
Zack Nootens <znootens@vulcanwireless.com><br>
<b>Subject:</b> S-band Proximity Hailing (A heads-up)<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">Hi Andrea, Greg, Dennis, and Ken,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We (JPL/Vulcan) recently discovered that the Lunar Pathfinder (LPF) hailing channel as designed will not have adequate link performance to close the link most of the time. We brought this to the attention of SSTL, the
developer of LPF. Consequently, SSTL agreed with the concern we had raised. We (JPL/Vulcan/SSTL) are now inclined to reduce the hailing channel rate from 8 kbps to 1 kbps and add rate 2/3 LDPC coding to it. This will increase the link performance substantially
allowing the hailing channel to close at the most adverse situations, i.e, longest distances and lowest elevation angles of interest to us. Moreover, we would like to propose to CCSDS to consider a recommendation for the proximity link were the data rate is
specified and channel coding is used. We can discuss this subject further during the CCSDS meeting in May at the joint meeting of your Study Groups. I would also like to acknowledge, Dr. Stuart Golden of Vulcan Wireless inc. for his discovery of the hailing
channel problem. <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The following table summarizes the proposed changes:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:17.0pt;color:black">Proposed S-Band Proximity Hailing Channel Changes<o:p></o:p></span></b></p>
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<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;color:black">Item<o:p></o:p></span></b></p>
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<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;color:black">Current Parameter<o:p></o:p></span></b></p>
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<p class="MsoNormal" align="center" style="text-align:center"><b><span style="font-size:14.0pt;color:black">Revised Parameter
<o:p></o:p></span></b></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">Link Data rate<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:14.0pt;color:black">8 kbps<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:14.0pt;color:black">1 kbps<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="color:black">Coding<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:14.0pt;color:black">No coding
<o:p></o:p></span></p>
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<p class="MsoNormal" align="center" style="text-align:center"><span style="font-size:14.0pt;color:black">LDPC 2/3 coding<o:p></o:p></span></p>
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<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Looking forward to meeting you all in May,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Faramaz <o:p></o:p></span></p>
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