void createTestData(int precision, int location, int matrix)
{
int status = 0, type;
// Allocate memory for data structures.
type = precision | OSKAR_COMPLEX;
if (matrix) type |= OSKAR_MATRIX;
jones = oskar_jones_create(type, location, num_stations, num_sources,
&status);
u_ = oskar_mem_create(precision, location, num_stations, &status);
v_ = oskar_mem_create(precision, location, num_stations, &status);
w_ = oskar_mem_create(precision, location, num_stations, &status);
sky = oskar_sky_create(precision, location, num_sources, &status);
tel = oskar_telescope_create(precision, location,
num_stations, &status);
ASSERT_EQ(0, status) << oskar_get_error_string(status);
// Fill data structures with random data in sensible ranges.
srand(2);
oskar_mem_random_range(oskar_jones_mem(jones), 1.0, 5.0, &status);
oskar_mem_random_range(u_, 1.0, 5.0, &status);
oskar_mem_random_range(v_, 1.0, 5.0, &status);
oskar_mem_random_range(w_, 1.0, 5.0, &status);
oskar_mem_random_range(
oskar_telescope_station_true_x_offset_ecef_metres(tel),
0.1, 1000.0, &status);
oskar_mem_random_range(
oskar_telescope_station_true_y_offset_ecef_metres(tel),
0.1, 1000.0, &status);
oskar_mem_random_range(
oskar_telescope_station_true_z_offset_ecef_metres(tel),
0.1, 1000.0, &status);
oskar_mem_random_range(oskar_sky_I(sky), 1.0, 2.0, &status);
oskar_mem_random_range(oskar_sky_Q(sky), 0.1, 1.0, &status);
oskar_mem_random_range(oskar_sky_U(sky), 0.1, 0.5, &status);
oskar_mem_random_range(oskar_sky_V(sky), 0.1, 0.2, &status);
oskar_mem_random_range(oskar_sky_l(sky), 0.1, 0.9, &status);
oskar_mem_random_range(oskar_sky_m(sky), 0.1, 0.9, &status);
oskar_mem_random_range(oskar_sky_n(sky), 0.1, 0.9, &status);
oskar_mem_random_range(oskar_sky_gaussian_a(sky), 0.1e-6, 0.2e-6,
&status);
oskar_mem_random_range(oskar_sky_gaussian_b(sky), 0.1e-6, 0.2e-6,
&status);
oskar_mem_random_range(oskar_sky_gaussian_c(sky), 0.1e-6, 0.2e-6,
&status);
ASSERT_EQ(0, status) << oskar_get_error_string(status);
}
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);
}
