Comments (10)
Hi @Tarlan0001,
IAU2000 reductions are not implemented yet. You should download and use the 1980 version.
from satellitetoolbox.jl.
You could get the file here:
https://datacenter.iers.org/eop/-/somos/5Rgv/latest/223
And read the file using
eop = read_iers_eop(eop_file)
from satellitetoolbox.jl.
@ronisbr Is there a way not to use the EOP file, taking some average value?
I'm propagating to the future, and the current data is useless...
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@Tarlan0001 What is your use case? If you are propagating far into the future, i.e. further than one year, it probably makes sense to use a lower precision Earth-fixed frame (e.g. IAU_EARTH
in SPICE parlance).
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@helgee Yes, I'm propagating further than 1 year.
Could you, please, explain in more detail what should I do for optimal solution? Shouldn't I use this library?
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@ronisbr Did you implement the IAU frame for Earth? I have an implementation in AstroDynCoordinates
but the package is currently not ready for public use.
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You have the implementation of coordinate transformation in AstroDynCoordinates?
My code:
eop = read_iers_eop(eop_file)
function ECI_ECEF(y,date)
D = rECItoECEF(J2000(), PEF(), date, eop)
r_pef = D*y[1:3]
v_pef = D*y[4:6] - [0;0;Ew] × r_pef
a_pef = D*y[7:9] - [0;0;Ew] × [0;0;Ew] × r_pef - 2*[0;0;Ew] × v_pef
D = rECEFtoECEF(PEF(), ITRF(), date, eop)
r_itrf = D*r_pef
v_itrf = D*v_pef
a_itrf = D*a_pef
return [r_itrf;v_itrf;a_itrf]
end
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Hi @helgee,
Isn’t IAU adopted the ICRF? In this case, no. We have however the GCRF, which is almost the same. But everything is computed using IAU76/FK5 theory, not the more recent IAU2000 models.
I am planning to add IAU2000 in the following weeks.
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Hi @Tarlan0001,
The difference between ITRF and PEF is that the former accounts for the polar motion, which is pretty much unmodelled AFAIK. The difference is not that much. The question is: do you really require ITRF? Isn’t PEF enough?
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Notice that if you use only J2000 and PEF (original IAU76/FK5 theory), then you can just drop EOP data from the function you are using. The difference will be in the conversion from UT1 and Terrestrial Time, which will provide very little difference.
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Related Issues (20)
- Remove unused variables
- Increase precision in ref. system conversions
- Why the track is not drifting? HOT 7
- Reference to geodesic coordinate frames HOT 2
- Wrong docstring for rv_to_mean_elements_j2osc HOT 1
- High precision orbit propagator HOT 3
- Automatically download TLE HOT 3
- Quick fix to rv_to_kepler HOT 7
- Docstring update for getters functions HOT 2
- Precompilation error when SatelliteToolbox and get_iers_eop are used as dependencies HOT 2
- IERS data service down HOT 7
- Daily Ap index using get_Ap() and get_space_indices()
- Allow the propagators to initialize the structure in place HOT 1
- 2023 Space Index File not available HOT 2
- Compatibility of transformations code with Automatic Differentiation tools (Zygote) HOT 2
- Discrepancies between J2 Propagator and STK J2Perturbations HOT 20
- sgp4 propagator accuracy HOT 5
- ITRF to TEME transformation HOT 4
- Can't find ground_station_accesses in v0.10.0 HOT 10
- init_orbit_propagator method definition warning HOT 2
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