[SLS-CC] [EXTERNAL] SLS-CC Digest, Vol 177, Issue 3

[Andrea Modenini (external)]

Dear Wing,
 thanks for your assessment. I had time to think upon, and agree with you.

I would then propose to the working group to include NASA Doppler model in 
the future update of the Channel Model (as part of AI_20_13) and with the 
possibility to the user of doing time replicas of the Doppler profile (in 
case he/she needs to perform simulations without the acquisition).

Please let me know if somebody disagrees with the approach,


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:   "Lee, Wing-tsz\(GSFC-5670\) via SLS-CC" <sls-cc at mailman.ccsds.org>
To:     "sls-cc at mailman.ccsds.org" <sls-cc at mailman.ccsds.org>
Date:   03-12-20 17:33
Subject:        Re: [SLS-CC] [EXTERNAL] SLS-CC Digest, Vol 177, Issue 3
Sent by:        "SLS-CC" <sls-cc-bounces at mailman.ccsds.org>



Hi Andrea,

We agree with you that the end points at which the Doppler profile and its 
negated version connects will have a derivative that’s undefined because 
the slope is nonzero (but very small).  However, since the Doppler effect 
on the carrier is simulated via a changing phase shift, which would be 
some integral of the Doppler frequency, the input phase shift would still 
be continuous. 

Conceptually, we believe that the direction of Doppler shouldn’t matter as 
long as 1) the phase is continuous (i.e. no phase jump at the transition 
point), 2) no frequency jump, and 3) the maximum Doppler rate of change is 
within the tracking capability of the loops, then the loops should 
maintain lock.

Thanks,
Wing

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