Has anybody managed to work out what the STK “fixed” frame is w.r.t. the Orekit Frame definitions? Or even just a formal specification? Am I missing something obvious (I don’t use STK much, so very possible)?
I see that STKEphemerisFileParser takes a Map<STKCoordinateSystem, Frame> , which makes me think that this is something unresolved.
I’ve looked for this info in their documentation and within STK itself a few times over the years, but I’ve never found an answer.
ITRF:
The International Terrestrial Reference Frame is only available for Earth. It is an alias for the Earth’s Fixed frame.
So for Earth, it is Orekit ITRF. But they do not specify a realization (ITRF 2008, 2014 etc.).
For other bodies it is more complicated and different from Orekit it seems.
Edit: this other resource seems to say that you can use a specific realization of the ITRF.