radio_telescope_delay_model
Baseline uvw coordinates and delays for radio interferometry, by two methods:
- CALC11 — the geodetic VLBI delay model used by correlators (delays + dry/wet troposphere; uvw via the DiFX finite-difference recipe), wrapped as a C++/pybind11 extension.
- astropy — geometric ITRF→GCRS projections (the SIRIUS/AstroVIPER algorithm).
Both return uvw in the archival / VLBI convention adopted by MSv4:
uvw = P(antenna1) − P(antenna2), W towards the source.
from radio_telescope_delay_model import calculate_uvw_calc, calculate_uvw_astropy
uvw, antenna1, antenna2 = calculate_uvw_calc(
antenna_position_itrf, times, phase_center_ra_dec
)
uvw, antenna1, antenna2 = calculate_uvw_astropy(
antenna_position_itrf, times, phase_center_ra_dec
)
Install
pip install . # needs a C++23 compiler and gfortran (CALC core)
python -m pytest tests/
The difxcalc11 sources come from the pinned DiFX submodule (extern/difx);
the build fetches it automatically (shallow + sparse, ~60 MB) when missing,
or run scripts/init_difx_submodule.sh yourself.
The JPL DE421 ephemeris and CALC coefficient files ship with the package.
Status
The CALC11 interface layer is C++ (bit-identical to the reference Fortran
build); the computational core is the reference Fortran, being ported to C++
module by module — see PORT_PLAN.md. Conventions and contributor rules:
AGENTS.md.
2 maintainers
Metadata
2 maintainers
Release files for radio-telescope-delay-model 0.1.1
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Source distribution (sdist)
| File | Size | Uploaded | Provenance | Actions |
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| radio_telescope_delay_model-0.1.1.tar.gz | 43.4 MB | Without provenance | Details for radio_telescope_delay_model-0.1.1.tar.gz |
Built distributions (wheels)
Total release size: 183.8 MB
Release files / radio_telescope_delay_model-0.1.1.tar.gz
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