[Difx-users] DiFX Software for Satellite Data Processing {External}

[深空探测]

Hi,  Leonid,  Adam,

I wanted to extend my sincere gratitude for your prompt response. Your
guidance and suggestions are highly appreciated.

I will carefully follow the steps outlined in the spacecraft-correlator
technical documentation and the page links you've recommended.

Best regards,

De Wu

Leonid Petrov <Leonid.Petrov at lpetrov.net> 于2023年8月29日周二 09:50写道：

> Nihao, De Wu,
>
>    We work on support of satellites as targets in difxvtd, but similar
> to difxcalc, it is still in the experimental phase and substantial
> efforts
> for its testing are needed before we could consider it operational.
> The principal difficulty is not in computation of path delay itself, but
> in development of visibility analysis of VLBI observations of satellites
> that
> is substantially different than visibility analysis of continuum
> targets.
>
> Leonid
>
>
> > On 2023-08-27 19:50, Adam Deller via Difx-users wrote:
> > Hi De Wu,
> >
> > The correlation code itself doesn't know or care about the nature of
> > the source; it just applies delays based on the sampled polynomials it
> > is given.  difxcalc is capable of generating delay models for
> > near-field objects using NASA's SPICE code, however I would caution
> > that this is a rarely used and hence rarely tested mode.  Some
> > (minimal) documentation is given on
> > https://www.atnf.csiro.au/vlbi/dokuwiki/doku.php/difx/spacecraft and
> > the vex2difx page it links to, under the SOURCE block.
> >
> > Cheers,
> > Adam
> >
> > On Fri, 25 Aug 2023 at 18:52, 深空探测 <wude7826580 at gmail.com>
> > wrote:
> >
> >> Dear all,
> >>
> >> I am currently using DiFX-2.6.2 software for my data processing
> >> needs. After employing the 'startdifx' command to generate the .im
> >> files, I have noticed that the generated .im files contain delay
> >> data for radio sources. However, my intention is to process data
> >> from artificial satellites. Given that the positions of artificial
> >> satellites change rapidly, the delay data in the .im files
> >> calculated based on the radio source model might not be suitable.
> >>
> >> In light of this, I am reaching out to inquire whether the DiFX
> >> software includes dedicated modules for handling artificial
> >> satellite data. Specifically, I am curious to know if there is a
> >> provision within the software to calculate delay data in accordance
> >> with the operational mode of artificial satellites. I am assuming
> >> that I would be providing the known orbital data of the satellites
> >> as input.
> >>
> >> Your guidance and insights on this matter would be greatly
> >> appreciated. Thank you in advance for your assistance.
> >>
> >> Best regards,
> >>
>
> >> De Wu
> >
> > --
> >
> > !=============================================================!
> > Prof. Adam Deller
> > Centre for Astrophysics & Supercomputing
> > Swinburne University of Technology
> > John St, Hawthorn VIC 3122 Australia
> > phone: +61 3 9214 5307
> > fax: +61 3 9214 8797
> > !=============================================================!
> > _______________________________________________
> > Difx-users mailing list
> > Difx-users at listmgr.nrao.edu
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>
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