galaxy_visibilities.h

/*
 * Copyright (c) 2015 Marzia Rivi
 *
 * This file is part of RadioLensfit.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see <http://www.gnu.org/licenses/>.
 */
 

#ifndef _GalaxyVisibilities_h
#define _GalaxyVisibilities_h

#include <gsl/gsl_rng.h>
#include "datatype.h"

#ifdef __cplusplus
extern "C" {
#endif
    
// model agalaxy at the phase centre: visibilities are real numbers
void model_galaxy_visibilities_at_zero(unsigned int nchannels, double* spec, double* wavenumbers,
                                double e1, double e2, double scalelength, unsigned long int num_coords,
                                double* uu_metres, double* vv_metres, unsigned long int* count, double* Modvis);

void model_galaxy_visibilities(unsigned int nchannels, double* spec, double* wavenumbers, double band_factor,
                               double acc_time, double e1, double e2, double scalelength, double l,
                               double m, unsigned long int num_coords, double* uu_metres, double* vv_metres,
                               unsigned long int* count, complexd* Modvis);
    
void data_galaxy_visibilities(double spectra, double wavenumber, double band_factor, double acc_time,
                              double e1, double e2, double scalelength, double flux, double l, double m,
                              unsigned long int num_coords, double* uu_metres, double* vv_metres, complexd* vis);
    
void add_system_noise(gsl_rng * gen, unsigned int num_baselines, unsigned int num_times, complexd* vis, double* sigma);
    
void data_visibilities_phase_shift(double wavenumber, double l, double m, unsigned long int num_coords,
                                       double* uu_metres, double* vv_metres, complexd* vis);
    
#ifdef __cplusplus
}
#endif

#endif