[SLS-CC] [EXTERNAL] Re: C&S AI_20_05: Doppler model

Thu Dec 3 14:30:28 UTC 2020

Hi Wai,
 for simulations that perform also the acquisition, I agree with you. 

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.
At least this is the approach that we adopt for error rate measurements in 
our simulations and testing of actual units.

Andrea

HE Space Operations for ESA - European Space Agency
Ph.D. Andrea Modenini
Communication Systems & Technologies Engineer 
TT&C and PDT Systems & Techniques Section (TEC-EST)
RF Systems Division
ESTEC
Keplerlaan 1, PO Box 299
NL-2200 AG Noordwijk, The Netherlands
andrea.modenini at esa.int | www.esa.int
T +31 71 56 53439

From:   "Fong, Wai H. (GSFC-5670)" <wai.h.fong at nasa.gov>
To:     "Andrea Modenini (external)" <Andrea.Modenini at esa.int>, 
"Massimo.Bertinelli at esa.int" <Massimo.Bertinelli at esa.int>
Cc:     "Space Link Coding & Synchronization Working Group" 
<sls-cc at mailman.ccsds.org>
Date:   03-12-20 15:22
Subject:        Re: [EXTERNAL] Re: [SLS-CC] C&S AI_20_05: Doppler model

Andrea,

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.

Regards,

Wai Fong, Ph.D.
Communications Engineer
Flight Microwave and Telecommunications Systems Branch
NASA Goddard Space Flight Center
Code 567
Greenbelt, MD  20771

From: SLS-CC <sls-cc-bounces at mailman.ccsds.org> on behalf of Andrea 
Modenini (external) <Andrea.Modenini at esa.int>
Sent: Thursday, December 3, 2020 6:58 AM
To: Massimo.Bertinelli at esa.int <Massimo.Bertinelli at esa.int>
Cc: Space Link Coding & Synchronization Working Group 
<sls-cc at mailman.ccsds.org>
Subject: [EXTERNAL] Re: [SLS-CC] C&S AI_20_05: Doppler model 

Hi all, 
 I have a single comment. 

The proposal looks good with me. I was however wondering, how to simulate 
multiple passes without introducing discontinuities in the simulation. 
Could we simply add a time replica of the curve in Figure-1, upside-down? 
Or does it cause discontinues on its derivative? 

Regards 

HE Space Operations for ESA - European Space Agency 
Ph.D. Andrea Modenini
Communication Systems & Technologies Engineer 
TT&C and PDT Systems & Techniques Section (TEC-EST)
RF Systems Division
ESTEC
Keplerlaan 1, PO Box 299
NL-2200 AG Noordwijk, The Netherlands
andrea.modenini at esa.int | www.esa.int
T +31 71 56 53439 

From:        Massimo.Bertinelli at esa.int 
To:        "Space Link Coding & Synchronization Working Group" 
<sls-cc at mailman.ccsds.org> 
Date:        02-12-20 22:19 
Subject:        [SLS-CC] C&S AI_20_05: Doppler model 
Sent by:        "SLS-CC" <sls-cc-bounces at mailman.ccsds.org> 

Dear WG members, 

in response to AI_20_05, Wai Fong and his colleagues have provided the 
following Doppler model 
(you can also find it in CWE, under C&S/CWE private/On-going work). 
Could you please provide your comments, if any, in order to integrate in 
the overall simulation model being developed (to be eventually shared with 

the RFM WG as well)? 

Best regards, 
Massimo 

---------------------------------------------------
Massimo Bertinelli
Communication Systems Engineer
ESA/Estec

Tel. +31 (0)71 5653435
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