orca.utils.calibratormodel

Calibrator sky model generation for OVRO-LWA.

This module generates sky models for calibration sources with primary beam corrections. Supports both full-sky models and specific source selection (e.g., Cygnus A only for delay calibration).

Classes:: model_generation: Main class for generating CASA component lists.

The generated component lists can be applied to measurement sets using CASA’s ft task for model-based calibration.

Classes

model_generation

Functions

conv_deg(dec)

Module Contents

orca.utils.calibratormodel.conv_deg(dec)[source]

class orca.utils.calibratormodel.model_generation(vis=None, filename='calibrator_source_list.txt', pol='I,Q,U,V', separate_pol=True, model=True)[source]

property vis[source]

min_beam_val = 0.01[source]

separate_pol = True[source]

property pol[source]

property calfilepath[source]

outpath[source]

polarisations[source]

num_pol[source]

property filename[source]

output_freq = None[source]

includesun = False[source]

solar_flux = 16000[source]

solar_alpha = 2.2[source]

modelcl = None[source]

verbose = True[source]

overwrite = True[source]

predict = True[source]

model = True[source]

point_source_model_needed = True[source]

primary_beam_model = '/lustre/msurajit/beam_model_nivedita/OVRO-LWA_soil_pt.h5'[source]

gen_model_file()[source]

Parameters:

filename – output txt file that contains clean components for all visible strong calibration sources in wsclean format
visibility – input visibility

Returns:

N/A

write_source_file(current_pol_index, source_name, muller_matrix, source_num)[source]

static primary_beam_value(current_pol_index, muller_matrix)[source]: returns elements from the first column of Muller Matrix

ctrl_freq()[source]

predict_flux(flux_hi, sp, muller_matrix, ref_freq)[source]

Given a flux at reference frequency in MHz and a sp_index, return the flux other frequenct

Parameters:

flux_hi – flux at the reference frequency
sp – spectral index
ref_freq – reference frequency in MHz
output_freq – output frequency in MHz

Returns:

flux caliculated at the output frequency

get_risen_source_list()[source]

point_source_model(included_sources=None)[source]

reset_image(imagename)[source]

generate_model_from_component_list(imagename)[source]

correct_for_restoring_beam(image)[source]

check_negative_in_model()[source]

do_prediction()[source]

gen_dummy_image(imagename)[source]

gen_model_cl(included_sources=None)[source]

Generate source models for bright sources as CASA clean components

Parameters:

msfile – input visibility
ref_freq – reference frequency of the preset flux values of bright sources
output_freq – output frequency to be written into the CASA component list
includesun – if True, add a precribed solar flux to the source list

Returns: