static void sim_baselines(oskar_Simulator* h, DeviceData* d, oskar_Sky* sky,
int channel_index_block, int time_index_block,
int time_index_simulation, int* status)
{
int num_baselines, num_stations, num_src, num_times_block, num_channels;
double dt_dump_days, t_start, t_dump, gast, frequency, ra0, dec0;
const oskar_Mem *x, *y, *z;
oskar_Mem* alias = 0;
/* Get dimensions. */
num_baselines = oskar_telescope_num_baselines(d->tel);
num_stations = oskar_telescope_num_stations(d->tel);
num_src = oskar_sky_num_sources(sky);
num_times_block = oskar_vis_block_num_times(d->vis_block);
num_channels = oskar_vis_block_num_channels(d->vis_block);
/* Return if there are no sources in the chunk,
* or if block time index requested is outside the valid range. */
if (num_src == 0 || time_index_block >= num_times_block) return;
/* Get the time and frequency of the visibility slice being simulated. */
dt_dump_days = h->time_inc_sec / 86400.0;
t_start = h->time_start_mjd_utc;
t_dump = t_start + dt_dump_days * (time_index_simulation + 0.5);
gast = oskar_convert_mjd_to_gast_fast(t_dump);
frequency = h->freq_start_hz + channel_index_block * h->freq_inc_hz;
/* Scale source fluxes with spectral index and rotation measure. */
oskar_sky_scale_flux_with_frequency(sky, frequency, status);
/* Evaluate station u,v,w coordinates. */
ra0 = oskar_telescope_phase_centre_ra_rad(d->tel);
dec0 = oskar_telescope_phase_centre_dec_rad(d->tel);
x = oskar_telescope_station_true_x_offset_ecef_metres_const(d->tel);
y = oskar_telescope_station_true_y_offset_ecef_metres_const(d->tel);
z = oskar_telescope_station_true_z_offset_ecef_metres_const(d->tel);
oskar_convert_ecef_to_station_uvw(num_stations, x, y, z, ra0, dec0, gast,
d->u, d->v, d->w, status);
/* Set dimensions of Jones matrices. */
if (d->R)
oskar_jones_set_size(d->R, num_stations, num_src, status);
if (d->Z)
oskar_jones_set_size(d->Z, num_stations, num_src, status);
oskar_jones_set_size(d->J, num_stations, num_src, status);
oskar_jones_set_size(d->E, num_stations, num_src, status);
oskar_jones_set_size(d->K, num_stations, num_src, status);
/* Evaluate station beam (Jones E: may be matrix). */
oskar_timer_resume(d->tmr_E);
oskar_evaluate_jones_E(d->E, num_src, OSKAR_RELATIVE_DIRECTIONS,
oskar_sky_l(sky), oskar_sky_m(sky), oskar_sky_n(sky), d->tel,
gast, frequency, d->station_work, time_index_simulation, status);
oskar_timer_pause(d->tmr_E);
#if 0
/* Evaluate ionospheric phase (Jones Z: scalar) and join with Jones E.
* NOTE this is currently only a CPU implementation. */
if (d->Z)
{
oskar_evaluate_jones_Z(d->Z, num_src, sky, d->tel,
&settings->ionosphere, gast, frequency, &(d->workJonesZ),
status);
oskar_timer_resume(d->tmr_join);
oskar_jones_join(d->E, d->Z, d->E, status);
oskar_timer_pause(d->tmr_join);
}
#endif
/* Evaluate parallactic angle (Jones R: matrix), and join with Jones Z*E.
* TODO Move this into station beam evaluation instead. */
if (d->R)
{
oskar_timer_resume(d->tmr_E);
oskar_evaluate_jones_R(d->R, num_src, oskar_sky_ra_rad_const(sky),
oskar_sky_dec_rad_const(sky), d->tel, gast, status);
oskar_timer_pause(d->tmr_E);
oskar_timer_resume(d->tmr_join);
oskar_jones_join(d->R, d->E, d->R, status);
oskar_timer_pause(d->tmr_join);
}
/* Evaluate interferometer phase (Jones K: scalar). */
oskar_timer_resume(d->tmr_K);
oskar_evaluate_jones_K(d->K, num_src, oskar_sky_l_const(sky),
oskar_sky_m_const(sky), oskar_sky_n_const(sky), d->u, d->v, d->w,
frequency, oskar_sky_I_const(sky),
h->source_min_jy, h->source_max_jy, status);
oskar_timer_pause(d->tmr_K);
/* Join Jones K with Jones Z*E. */
oskar_timer_resume(d->tmr_join);
oskar_jones_join(d->J, d->K, d->R ? d->R : d->E, status);
oskar_timer_pause(d->tmr_join);
/* Create alias for auto/cross-correlations. */
oskar_timer_resume(d->tmr_correlate);
alias = oskar_mem_create_alias(0, 0, 0, status);
/* Auto-correlate for this time and channel. */
if (oskar_vis_block_has_auto_correlations(d->vis_block))
{
oskar_mem_set_alias(alias,
oskar_vis_block_auto_correlations(d->vis_block),
num_stations *
(num_channels * time_index_block + channel_index_block),
num_stations, status);
oskar_auto_correlate(alias, num_src, d->J, sky, status);
}
/* Cross-correlate for this time and channel. */
if (oskar_vis_block_has_cross_correlations(d->vis_block))
{
oskar_mem_set_alias(alias,
oskar_vis_block_cross_correlations(d->vis_block),
num_baselines *
(num_channels * time_index_block + channel_index_block),
num_baselines, status);
oskar_cross_correlate(alias, num_src, d->J, sky, d->tel,
d->u, d->v, d->w, gast, frequency, status);
}
/* Free alias for auto/cross-correlations. */
oskar_mem_free(alias, status);
oskar_timer_pause(d->tmr_correlate);
}
void oskar_evaluate_jones_Z(oskar_Jones* Z, const oskar_Sky* sky,
const oskar_Telescope* telescope,
const oskar_SettingsIonosphere* settings, double gast,
double frequency_hz, oskar_WorkJonesZ* work, int* status)
{
int i, num_sources, num_stations;
/* Station position in ECEF frame */
double station_x, station_y, station_z, wavelength;
oskar_Mem *Z_station;
int type;
oskar_Sky* sky_cpu; /* Copy of the sky model on the CPU */
/* Check if safe to proceed. */
if (*status) return;
/* Check data types. */
type = oskar_sky_precision(sky);
if (oskar_telescope_precision(telescope) != type ||
oskar_jones_type(Z) != (type | OSKAR_COMPLEX) ||
oskar_work_jones_z_type(work) != type)
{
*status = OSKAR_ERR_BAD_DATA_TYPE;
return;
}
/* For now, this function requires data is on the CPU .. check this. */
/* Resize the work array (if needed) */
num_stations = oskar_telescope_num_stations(telescope);
num_sources = oskar_sky_num_sources(sky);
oskar_work_jones_z_resize(work, num_sources, status);
/* Copy the sky model to the CPU. */
sky_cpu = oskar_sky_create_copy(sky, OSKAR_CPU, status);
Z_station = oskar_mem_create_alias(0, 0, 0, status);
wavelength = 299792458.0 / frequency_hz;
/* Evaluate the ionospheric phase screen for each station at each
* source pierce point. */
for (i = 0; i < num_stations; ++i)
{
double last, lon, lat;
const oskar_Station* station;
station = oskar_telescope_station_const(telescope, i);
lon = oskar_station_lon_rad(station);
lat = oskar_station_lat_rad(station);
last = gast + lon;
/* Evaluate horizontal x,y,z source positions (for which to evaluate
* pierce points) */
oskar_convert_relative_directions_to_enu_directions(
work->hor_x, work->hor_y, work->hor_z, num_sources,
oskar_sky_l_const(sky_cpu), oskar_sky_m_const(sky_cpu),
oskar_sky_n_const(sky_cpu), last - oskar_sky_reference_ra_rad(sky_cpu),
oskar_sky_reference_dec_rad(sky_cpu), lat, status);
/* Obtain station coordinates in the ECEF frame. */
evaluate_station_ECEF_coords(&station_x, &station_y, &station_z, i,
telescope);
/* Obtain the pierce points. */
/* FIXME(BM) this is current hard-coded to TID height screen 0
* this fix is only needed to support multiple screen heights. */
oskar_evaluate_pierce_points(work->pp_lon, work->pp_lat,
work->pp_rel_path, station_x, station_y,
station_z, settings->TID[0].height_km * 1000., num_sources,
work->hor_x, work->hor_y, work->hor_z, status);
/* Evaluate TEC values for the pierce points */
oskar_evaluate_TEC(work, num_sources, settings, gast, status);
/* Get a pointer to the Jones matrices for the station */
oskar_jones_get_station_pointer(Z_station, Z, i, status);
/* Populate the Jones matrix with ionospheric phase */
evaluate_jones_Z_station(Z_station, wavelength,
work->total_TEC, work->hor_z, settings->min_elevation,
num_sources, status);
}
oskar_sky_free(sky_cpu, status);
oskar_mem_free(Z_station, status);
}
