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

[Fong, Wai H. (GSFC-5670)]

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


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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
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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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