static void evaluate_station_ECEF_coords(
double* station_x, double* station_y, double* station_z,
int stationID, const oskar_Telescope* telescope)
{
double st_x, st_y, st_z;
double lon, lat, alt;
const oskar_Station* station;
const void *x_, *y_, *z_;
x_ = oskar_mem_void_const(
oskar_telescope_station_true_x_offset_ecef_metres_const(telescope));
y_ = oskar_mem_void_const(
oskar_telescope_station_true_y_offset_ecef_metres_const(telescope));
z_ = oskar_mem_void_const(
oskar_telescope_station_true_z_offset_ecef_metres_const(telescope));
station = oskar_telescope_station_const(telescope, stationID);
lon = oskar_station_lon_rad(station);
lat = oskar_station_lat_rad(station);
alt = oskar_station_alt_metres(station);
if (oskar_mem_type(
oskar_telescope_station_true_x_offset_ecef_metres_const(telescope)) ==
OSKAR_DOUBLE)
{
st_x = ((const double*)x_)[stationID];
st_y = ((const double*)y_)[stationID];
st_z = ((const double*)z_)[stationID];
}
else
{
st_x = (double)((const float*)x_)[stationID];
st_y = (double)((const float*)y_)[stationID];
st_z = (double)((const float*)z_)[stationID];
}
oskar_convert_offset_ecef_to_ecef(1, &st_x, &st_y, &st_z, lon, lat, alt,
station_x, station_y, station_z);
}
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);
}
static void set_up_vis_header(oskar_Simulator* h, int* status)
{
int num_stations, vis_type;
const double rad2deg = 180.0/M_PI;
int write_autocorr = 0, write_crosscorr = 0;
if (*status) return;
/* Check type of correlations to produce. */
if (h->correlation_type == 'C')
write_crosscorr = 1;
else if (h->correlation_type == 'A')
write_autocorr = 1;
else if (h->correlation_type == 'B')
{
write_autocorr = 1;
write_crosscorr = 1;
}
/* Create visibility header. */
num_stations = oskar_telescope_num_stations(h->tel);
vis_type = h->prec | OSKAR_COMPLEX;
if (oskar_telescope_pol_mode(h->tel) == OSKAR_POL_MODE_FULL)
vis_type |= OSKAR_MATRIX;
h->header = oskar_vis_header_create(vis_type, h->prec,
h->max_times_per_block, h->num_time_steps, h->num_channels,
h->num_channels, num_stations, write_autocorr, write_crosscorr,
status);
/* Add metadata from settings. */
oskar_vis_header_set_freq_start_hz(h->header, h->freq_start_hz);
oskar_vis_header_set_freq_inc_hz(h->header, h->freq_inc_hz);
oskar_vis_header_set_time_start_mjd_utc(h->header, h->time_start_mjd_utc);
oskar_vis_header_set_time_inc_sec(h->header, h->time_inc_sec);
/* Add settings file contents if defined. */
if (h->settings_path)
{
oskar_Mem* temp;
temp = oskar_mem_read_binary_raw(h->settings_path,
OSKAR_CHAR, OSKAR_CPU, status);
oskar_mem_copy(oskar_vis_header_settings(h->header), temp, status);
oskar_mem_free(temp, status);
}
/* Copy other metadata from telescope model. */
oskar_vis_header_set_time_average_sec(h->header,
oskar_telescope_time_average_sec(h->tel));
oskar_vis_header_set_channel_bandwidth_hz(h->header,
oskar_telescope_channel_bandwidth_hz(h->tel));
oskar_vis_header_set_phase_centre(h->header, 0,
oskar_telescope_phase_centre_ra_rad(h->tel) * rad2deg,
oskar_telescope_phase_centre_dec_rad(h->tel) * rad2deg);
oskar_vis_header_set_telescope_centre(h->header,
oskar_telescope_lon_rad(h->tel) * rad2deg,
oskar_telescope_lat_rad(h->tel) * rad2deg,
oskar_telescope_alt_metres(h->tel));
oskar_mem_copy(oskar_vis_header_station_x_offset_ecef_metres(h->header),
oskar_telescope_station_true_x_offset_ecef_metres_const(h->tel),
status);
oskar_mem_copy(oskar_vis_header_station_y_offset_ecef_metres(h->header),
oskar_telescope_station_true_y_offset_ecef_metres_const(h->tel),
status);
oskar_mem_copy(oskar_vis_header_station_z_offset_ecef_metres(h->header),
oskar_telescope_station_true_z_offset_ecef_metres_const(h->tel),
status);
}
