[time-nuts] Re: update on SATRE TWSTFT decoding

[Demetrios Matsakis]

ION holds the copyright to their PTTI papers “as a whole”.   I’m sure Carsten won’t mind my sharing his.  

> On Sep 7, 2022, at 1:18 AM, jeanmichel.friedt--- via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Dear time-nuts community,
> following my end-of-March request for SATRE/MITREX information which led to very interesting
> information (https://febo.com/pipermail/time-nuts_lists.febo.com/2022-March/105351.html), I have 
> mostly completed Two Way Satellite Time and Frequency Transfer (TWSTFT) signal decoding which might
> be relevant to this audience since as a side project I am wondering whether this signal can be of
> any use in one-way communication. 
> 
> I will be discussing at the upcoming GNU Radio Conference the topic with the video of the
> presentation
> at http://jmfriedt.free.fr/grcon2022_jmfriedt.mp4 with the slides at
> http://jmfriedt.free.fr/grcon2022.pdf 
> and the manuscript for the proceedings at http://jmfriedt.free.fr/glmf_satre_eng.pdf (for the
> French speaking audience, this is an English translation of http://jmfriedt.free.fr/glmf_satre.pdf
> to be published in the special issue of GNU/Linux Magazine France in a couple of weeks). The github
> repository is at https://github.com/oscimp/gr-satre
> 
> I am still struggling to try and measure the satellite motion to try to compensate its impact on
> the
> time of flight. I was informed that C. Rieck published a couple of papers on the topic, and indeed
> C. Rieck, P. Jarlemark & K. Jaldehag, Passive Utilization of the TWSTFT Technique, Proc EFTF (2018)
> does mention "by a GPS ICD [7] compatible Kepler model, which is estimated using iterative
> nonlinear least 
> squares" which does not tell me much on the technical challenges, with the paper just going on with
> results but no way to reproduce the actual computations (of course). [7] is a general specification
> of
> NAVSTAR/GPS with hardly any relevant information. At about the same time 
> C. Rieck, P. Jarlemark & K. Jaldehag, Utilizing TWSTFT in a Passive Configuration, Proc. 48th
> Annual 
> Precise Time and Time Interval Systems and Applications Meeting (2017) was published but
> unfortunately 
> ION publications are not (yet) collected by Library Genesis nor accessible through SciHub so I
> cannot 
> find a copy. I am not sure I'll find any more technical information there than in the EFTF
> proceeding, 
> but if anyone can send a copy I'd be grateful.
> 
> Thanks, Jean-Michel
> 
> --
> JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon, France
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