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For an idea of what you can do with WODEN, here is the --help from run_woden.py. Most options can be read in automagically from a metafits file (again, check out https://woden.readthedocs.io/en/latest/ for examples and explanations on how to run WODEN).
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$ FREQUENCY OPTIONS:
--band_nums BAND_NUMS
Defaults to running 24 coarse bands. Alternatively, enter
required numbers delineated by commas, e.g. --band_nums=1,7,9
--lowest_channel_freq LOWEST_CHANNEL_FREQ
Set the frequency (Hz) of the lowest channel for band 1. If
using a metafits file, this will override the frequency in the
metafits
--coarse_band_width COARSE_BAND_WIDTH
Set the width of each coarse band If using a metafits file,
this will override the frequency in the metafits
--num_freq_channels NUM_FREQ_CHANNELS
Number of fine frequency channels to simulate - defaults to
--coarse_band_width / --freq_res
--freq_res FREQ_RES Fine channel frequnecy resolution (Hz) - will default to what
is in the metafits
TIME OPTIONS:
--num_time_steps NUM_TIME_STEPS
The number of time steps to simualte. Defaults to how many are
inthe metafits if using metafits
--time_res TIME_RES Time resolution (s) - will default to what is in the metafits
if the metafits if using metafits
OBSERVATION OPTIONS:
--ra0 RA0 RA of the desired phase centre (deg)
--dec0 DEC0 Dec of the desired phase centre (deg)
--date DATE Initial UTC date of the observatio in format YYYY-MM-
DDThh:mm:ss This is used to set the LST and array precession.
This is set automatically when reading a metafits but including
this will override the date in the metafits
TELESCOPE OPTIONS:
--latitude LATITUDE Latitude (deg) of the array - defaults to MWA at -26.7033194444
--longitude LONGITUDE
Longitude (deg) of the array - defaults to MWA at 116.670813889
--array_height ARRAY_HEIGHT
Height (m) of the array above sea level - defaults to MWA at
377.0
--array_layout ARRAY_LAYOUT
Instead of reading the array layout from the metafits file,
read from a text file. Store antenna positions as offset from
array centre, in east, north, height coords (metres)
--primary_beam PRIMARY_BEAM
Which primary beam to use in the simulation.
Options are:
- MWA_FEE (MWA fully embedded element model)
- MWA_analy (MWA analytic model)
- Gaussian (Analytic symmetric Gaussian)
see --gauss_beam_FWHM and
and --gauss_beam_ref_freq for
fine control
- EDA2 (Analytic dipole with a ground mesh)
- none (Don't use a primary beam at all)
Defaults to --primary_beam=none
--gauss_beam_FWHM GAUSS_BEAM_FWHM
The FWHM of the Gaussian beam in deg - WODEN defaults to using
20 deg if this is not set
--gauss_beam_ref_freq GAUSS_BEAM_REF_FREQ
The frequency at which the gauss beam FWHM is set at. If not
set, WODEN will default to 150MHz.
--gauss_ra_point GAUSS_RA_POINT
The initial RA (deg) to point the Gaussian beam at. This will
be used to calculate an hour angle at which the beam will
remain pointed at for the duration of the observation. Defaults
to the RA of the metafits if available, or the RA of the phase
centre if not
--gauss_dec_point GAUSS_DEC_POINT
The initial Dec (deg) to point the Gaussian beam at. Defaults
to the Dec of the metafits if available, or the Dec of the
phase centre if not
--hdf5_beam_path HDF5_BEAM_PATH
Location of the hdf5 file holding the FEE beam coefficients
--MWA_FEE_delays MWA_FEE_DELAYS
A list of 16 delays to point the MWA primary beam
model enter as as list like:
--MWA_FEE_delays=[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
for a zenith pointing. This is read directly from
the metafits if using a metafits file
--telescope_name TELESCOPE_NAME
Name of telescope written out to the uvfits file, defaults to
MWA
INPUT/OUTPUT OPTIONS:
--cat_filename CAT_FILENAME
Path to WODEN style sky model
--metafits_filename METAFITS_FILENAME
MWA style metafits file to base the simulation on. Array
layout, frequency and time parameters are all set by this
option, but can be overridden using other arguments
--output_uvfits_prepend OUTPUT_UVFITS_PREPEND
Prepend name for uvfits - will append band%02d.uvfits %band_num
at the end. Defaults to "output".
--sky_crop_components
WODEN will crop out sky model information that is below the
horizon for the given LST. By default, for each SOURCE in the
sky model, if any COMPONENT is below the horizon, the entire
source will be flagged. If --sky_crop_components is included
WODEN will include any COMPONENT above the horizon, regardless
of which SOURCE it belongs to.
SIMULATOR OPTIONS:
--remove_phase_tracking
By adding this flag, remove the phase tracking of the
visibilities - use this to feed uvfits into the RTS
--no_tidy Defaults to deleting output binary files from woden and json
files. Add this flag to not delete those files
--chunking_size CHUNKING_SIZE
The chunk size to break up the point sources into for
processing - defaults to 0 (use default chunking in WODEN)
--dry_run Add this to NOT call the WODEN executable - this will just
write out the .json file and do nothing else |
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