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

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@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 > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-leave@lists.febo.com

Thank you again list, this looks like a much richer article than the EFTF short contribution. For the North American audience, the Telstar-11N downlink frequency should be 11747.7400 MHz, which I mentioned in the video presentation but not in the manuscript. I checked from France that I could receive the American broadcast signal on 11497.0600 MHz using the consumer electronics TV parabola receiver but of course have not means of validating the North American downlink during even UTC hours. Hoping some result can come out of it, best wishes, Jean-Michel