<span style=" font-size:10pt;font-family:sans-serif">Hi Wai,</span>
<br><span style=" font-size:10pt;font-family:sans-serif"> for simulations
that perform also the acquisition, I agree with you. </span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">However, if we
need to perform error rate measurements in tracking conditions, we usually
do a very long simulation that covers in duration several passes, and adding
the acquisition every time would be a burden for the test.</span>
<br><span style=" font-size:10pt;font-family:sans-serif">At least this
is the approach that we adopt for error rate measurements in our simulations
and testing of actual units.</span>
<br>
<br><span style=" font-size:10pt;font-family:sans-serif">Andrea</span>
<br>
<br><span style=" font-size:8pt;color:#808080;font-family:Verdana"><b>HE
Space Operations for ESA - European Space Agency</b></span>
<br><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
| </span><a href=http://www.esa.int/><span style=" font-size:8pt;color:#8f8f8f;font-family:Verdana"><u>www.esa.int</u></span></a><span style=" font-size:8pt;color:#808080;font-family:Verdana"><br>
T +31 71 56 53439</span>
<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">"Fong,
Wai H. (GSFC-5670)" <wai.h.fong@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">"Andrea
Modenini (external)" <Andrea.Modenini@esa.int>, "Massimo.Bertinelli@esa.int"
<Massimo.Bertinelli@esa.int></span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Cc:
</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">03-12-20
15:22</span>
<br><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif">Subject:
</span><span style=" font-size:9pt;font-family:sans-serif">Re:
[EXTERNAL] Re: [SLS-CC] C&S AI_20_05: Doppler model</span>
<br>
<hr noshade>
<br>
<br>
<br><span style=" font-size:12pt;font-family:Calibri">Andrea,</span>
<br>
<br><span style=" font-size:12pt;font-family:Calibri">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.</span>
<br>
<br><span style=" font-size:12pt;font-family:Calibri">Regards,</span>
<br>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Arial">Wai
Fong, Ph.D.</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Arial">Communications
Engineer</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Arial">Flight
Microwave and Telecommunications Systems Branch</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Arial">NASA
Goddard Space Flight Center</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Arial">Code
567</span></p>
<p style="margin-top:0px;margin-Bottom:0px"><span style=" font-size:11pt;font-family:Arial">Greenbelt,
MD 20771</span></p>
<br>
<br>
<br>
<hr>
<br><span style=" font-size:11pt;font-family:Calibri"><b>From:</b> SLS-CC
<sls-cc-bounces@mailman.ccsds.org> on behalf of Andrea Modenini (external)
<Andrea.Modenini@esa.int><b><br>
Sent:</b> Thursday, December 3, 2020 6:58 AM<b><br>
To:</b> Massimo.Bertinelli@esa.int <Massimo.Bertinelli@esa.int><b><br>
Cc:</b> Space Link Coding & Synchronization Working Group <sls-cc@mailman.ccsds.org><b><br>
Subject:</b> [EXTERNAL] Re: [SLS-CC] C&S AI_20_05: Doppler model</span><span style=" font-size:12pt">
</span>
<br><span style=" font-size:12pt"> </span>
<br><span style=" font-size:10pt;font-family:sans-serif">Hi all,</span><span style=" font-size:12pt">
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
I have a single comment.</span><span style=" font-size:12pt"> <br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
The proposal looks good with me. I was however wondering, how to simulate
multiple passes without introducing discontinuities in the simulation.</span><span style=" font-size:12pt">
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Could we simply add a time replica of the curve in Figure-1, upside-down?
Or does it cause discontinues on its derivative? </span><span style=" font-size:12pt"><br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Regards</span><span style=" font-size:12pt"> <br>
</span><span style=" font-size:8pt;color:#808080;font-family:Verdana"><b><br>
HE Space Operations for ESA - European Space Agency</b></span><span style=" font-size:12pt">
</span><span style=" font-size:8pt;color:#00a1e0;font-family:Verdana"><b><br>
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"><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<br>
andrea.modenini@esa.int | </span><a href="https://gcc02.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.esa.int%2F&data=04%7C01%7Cwai.h.fong%40nasa.gov%7Cb85cd53ef9b84efec17908d89782db9f%7C7005d45845be48ae8140d43da96dd17b%7C0%7C0%7C637425935595877425%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=WnMAD5zI37rCGzpDjckEelxHYK5%2FQv79j5zt89C8RPM%3D&reserved=0"><span style=" font-size:8pt;color:#8f8f8f;font-family:Verdana"><u>www.esa.int</u></span></a><span style=" font-size:8pt;color:#808080;font-family:Verdana"><br>
T +31 71 56 53439</span><span style=" font-size:12pt"> <br>
<br>
<br>
</span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
From: </span><span style=" font-size:9pt;font-family:sans-serif">Massimo.Bertinelli@esa.int</span><span style=" font-size:12pt">
</span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
To: </span><span style=" font-size:9pt;font-family:sans-serif">"Space
Link Coding & Synchronization Working Group" <sls-cc@mailman.ccsds.org></span><span style=" font-size:12pt">
</span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
Date: </span><span style=" font-size:9pt;font-family:sans-serif">02-12-20
22:19</span><span style=" font-size:12pt"> </span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
Subject: </span><span style=" font-size:9pt;font-family:sans-serif">[SLS-CC]
C&S AI_20_05: Doppler model</span><span style=" font-size:12pt"> </span><span style=" font-size:9pt;color:#5f5f5f;font-family:sans-serif"><br>
Sent by: </span><span style=" font-size:9pt;font-family:sans-serif">"SLS-CC"
<sls-cc-bounces@mailman.ccsds.org></span><span style=" font-size:12pt">
<br>
</span>
<hr noshade><span style=" font-size:12pt"><br>
<br>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
Dear WG members,</span><span style=" font-size:12pt"> </span><span style=" font-size:10pt;font-family:sans-serif"><br>
<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"> </span><span style=" font-size:10pt;font-family:sans-serif"><br>
<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>
</span><span style=" font-size:10pt;font-family:sans-serif"><br>
<br>
<br>
<br>
---------------------------------------------------<br>
Massimo Bertinelli<br>
Communication Systems Engineer<br>
ESA/Estec<br>
<br>
Tel. +31 (0)71 5653435<br>
--------------------------------------------------</span><span style=" font-size:12pt">
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</PRE>