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Andrea,</div>
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I guess we don't fully understand why you would want to make the profile continuous, i.e. without discontinuities. A LEO pass will need to acquire at the beginning of every pass. If you try to keep it continuous you are essentially maintaining lock through
multiple passes. This is not an accurate model and does not apply enough stress to the system.</div>
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Regards,</div>
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<span style="margin:0px; font-size:10.5pt; font-family:Arial,sans-serif; color:black">Wai Fong, Ph.D.</span></p>
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<span style="margin:0px; font-size:10.5pt; font-family:Arial,sans-serif; color:black">Communications Engineer</span></p>
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<span style="margin:0px; font-size:10.5pt; font-family:Arial,sans-serif; color:black">Flight Microwave and Telecommunications Systems Branch</span></p>
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<span style="margin:0px; font-size:10.5pt; font-family:Arial,sans-serif; color:black">NASA Goddard Space Flight Center</span></p>
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<span style="margin:0px; font-size:10.5pt; font-family:Arial,sans-serif; color:black">Code 567</span></p>
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<span style="margin:0px; font-size:10.5pt; font-family:Arial,sans-serif; color:black">Greenbelt, MD 20771</span></p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> SLS-CC <sls-cc-bounces@mailman.ccsds.org> on behalf of Andrea Modenini (external) <Andrea.Modenini@esa.int><br>
<b>Sent:</b> Thursday, December 3, 2020 6:58 AM<br>
<b>To:</b> Massimo.Bertinelli@esa.int <Massimo.Bertinelli@esa.int><br>
<b>Cc:</b> Space Link Coding & Synchronization Working Group <sls-cc@mailman.ccsds.org><br>
<b>Subject:</b> [EXTERNAL] Re: [SLS-CC] C&S AI_20_05: Doppler model</font>
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<div><span style="font-size:10pt; font-family:sans-serif">Hi all,</span> <br>
<span style="font-size:10pt; font-family:sans-serif"> I have a single comment.</span>
<br>
<br>
<span style="font-size:10pt; font-family:sans-serif">The proposal looks good with me. I was however wondering, how to simulate multiple passes without introducing discontinuities in the simulation.</span>
<br>
<span style="font-size:10pt; font-family:sans-serif">Could we simply add a time replica of the curve in Figure-1, upside-down? Or does it cause discontinues on its derivative?
</span><br>
<br>
<span style="font-size:10pt; font-family:sans-serif">Regards</span> <br>
<br>
<span style="font-size:8pt; color:#808080; font-family:Verdana"><b>HE Space Operations for ESA - European Space Agency</b></span>
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<span style="font-size:8pt; color:#00a1e0; font-family:Verdana"><b>Ph.D. Andrea Modenini</b></span><span style="font-size:8pt; color:#808080; font-family:Verdana"><b><br>
Communication Systems & Technologies Engineer</b></span><span style="font-size:12pt; font-family:Tms Rmn"><b>
</b></span><span style="font-size:8pt; color:#808080; font-family:Verdana"><br>
TT&C and PDT Systems & Techniques Section (TEC-EST)<br>
RF Systems Division<b><br>
ESTEC</b><br>
Keplerlaan 1, PO Box 299<br>
NL-2200 AG Noordwijk, The Netherlands</span><span style="font-size:8pt; color:blue; font-family:Verdana"><u><br>
</u></span><span style="font-size:8pt; color:#808080; font-family:Verdana">andrea.modenini@esa.int |
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T +31 71 56 53439</span> <br>
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<br>
<span style="font-size:9pt; color:#5f5f5f; font-family:sans-serif">From: </span><span style="font-size:9pt; font-family:sans-serif">Massimo.Bertinelli@esa.int</span>
<br>
<span style="font-size:9pt; color:#5f5f5f; font-family:sans-serif">To: </span><span style="font-size:9pt; font-family:sans-serif">"Space Link Coding & Synchronization Working Group" <sls-cc@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">02-12-20 22:19</span>
<br>
<span style="font-size:9pt; color:#5f5f5f; font-family:sans-serif">Subject: </span><span style="font-size:9pt; font-family:sans-serif">[SLS-CC] C&S AI_20_05: Doppler model</span>
<br>
<span style="font-size:9pt; color:#5f5f5f; font-family:sans-serif">Sent by: </span><span style="font-size:9pt; font-family:sans-serif">"SLS-CC" <sls-cc-bounces@mailman.ccsds.org></span>
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<span style="font-size:10pt; font-family:sans-serif">Dear WG members,</span><span style="font-size:12pt">
<br>
</span><span style="font-size:10pt; font-family:sans-serif"><br>
in response to AI_20_05, Wai Fong and his colleagues have provided the following Doppler model</span><span style="font-size:12pt">
</span><span style="font-size:10pt; font-family:sans-serif"><br>
(you can also find it in CWE, under C&S/CWE private/On-going work).</span><span style="font-size:12pt">
</span><span style="font-size:10pt; font-family:sans-serif"><br>
Could you please provide your comments, if any, in order to integrate in the overall simulation model being developed (to be eventually shared with</span><span style="font-size:12pt">
</span><span style="font-size:10pt; font-family:sans-serif"><br>
the RFM WG as well)?</span><span style="font-size:12pt"> <br>
</span><span style="font-size:10pt; font-family:sans-serif"><br>
Best regards,</span><span style="font-size:12pt"> </span><span style="font-size:10pt; font-family:sans-serif"><br>
Massimo</span><span style="font-size:12pt"> <br>
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</span><span style="font-size:10pt; font-family:sans-serif"><br>
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---------------------------------------------------<br>
Massimo Bertinelli<br>
Communication Systems Engineer<br>
ESA/Estec<br>
<br>
Tel. +31 (0)71 5653435<br>
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