void oskar_evaluate_station_beam_aperture_array(oskar_Mem* beam,
const oskar_Station* station, int num_points, const oskar_Mem* x,
const oskar_Mem* y, const oskar_Mem* z, double gast,
double frequency_hz, oskar_StationWork* work, int time_index,
int* status)
{
int start;
/* Check if safe to proceed. */
if (*status) return;
/* Evaluate beam immediately, without chunking, if there are no
* child stations. */
if (!oskar_station_has_child(station))
{
oskar_evaluate_station_beam_aperture_array_private(beam, station,
num_points, x, y, z, gast, frequency_hz, work,
time_index, 0, status);
}
else
{
oskar_Mem *c_beam, *c_x, *c_y, *c_z;
c_beam = oskar_mem_create_alias(0, 0, 0, status);
c_x = oskar_mem_create_alias(0, 0, 0, status);
c_y = oskar_mem_create_alias(0, 0, 0, status);
c_z = oskar_mem_create_alias(0, 0, 0, status);
/* Split up list of input points into manageable chunks. */
for (start = 0; start < num_points; start += MAX_CHUNK_SIZE)
{
int chunk_size;
/* Get size of current chunk. */
chunk_size = num_points - start;
if (chunk_size > MAX_CHUNK_SIZE) chunk_size = MAX_CHUNK_SIZE;
/* Get pointers to start of chunk input data. */
oskar_mem_set_alias(c_beam, beam, start, chunk_size, status);
oskar_mem_set_alias(c_x, x, start, chunk_size, status);
oskar_mem_set_alias(c_y, y, start, chunk_size, status);
oskar_mem_set_alias(c_z, z, start, chunk_size, status);
/* Start recursive call at depth 1 (depth 0 is element level). */
oskar_evaluate_station_beam_aperture_array_private(c_beam, station,
chunk_size, c_x, c_y, c_z, gast, frequency_hz, work,
time_index, 1, status);
}
/* Release handles for chunk memory. */
oskar_mem_free(c_beam, status);
oskar_mem_free(c_x, status);
oskar_mem_free(c_y, status);
oskar_mem_free(c_z, 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);
}
int main(int argc, char** argv)
{
int status = 0;
oskar::OptionParser opt("oskar_evaulate_pierce_points",
oskar_version_string());
opt.add_required("settings file");
if (!opt.check_options(argc, argv)) return EXIT_FAILURE;
const char* settings_file = opt.get_arg();
// Create the log.
oskar_Log* log = oskar_log_create(OSKAR_LOG_MESSAGE, OSKAR_LOG_STATUS);
oskar_log_message(log, 'M', 0, "Running binary %s", argv[0]);
// Enum values used in writing time-freq data binary files
enum OSKAR_TIME_FREQ_TAGS
{
TIME_IDX = 0,
FREQ_IDX = 1,
TIME_MJD_UTC = 2,
FREQ_HZ = 3,
NUM_FIELDS = 4,
NUM_FIELD_TAGS = 5,
HEADER_OFFSET = 10,
DATA = 0,
DIMS = 1,
LABEL = 2,
UNITS = 3,
GRP = OSKAR_TAG_GROUP_TIME_FREQ_DATA
};
oskar_Settings_old settings;
oskar_settings_old_load(&settings, log, settings_file, &status);
oskar_log_set_keep_file(log, settings.sim.keep_log_file);
if (status) return status;
oskar_Telescope* tel = oskar_settings_to_telescope(&settings, log, &status);
oskar_Sky* sky = oskar_settings_to_sky(&settings, log, &status);
// FIXME remove this restriction ... (see evaluate Z)
if (settings.ionosphere.num_TID_screens != 1)
return OSKAR_ERR_SETUP_FAIL;
int type = settings.sim.double_precision ? OSKAR_DOUBLE : OSKAR_SINGLE;
int loc = OSKAR_CPU;
int num_sources = oskar_sky_num_sources(sky);
oskar_Mem *hor_x, *hor_y, *hor_z;
hor_x = oskar_mem_create(type, loc, num_sources, &status);
hor_y = oskar_mem_create(type, loc, num_sources, &status);
hor_z = oskar_mem_create(type, loc, num_sources, &status);
oskar_Mem *pp_lon, *pp_lat, *pp_rel_path;
int num_stations = oskar_telescope_num_stations(tel);
int num_pp = num_stations * num_sources;
pp_lon = oskar_mem_create(type, loc, num_pp, &status);
pp_lat = oskar_mem_create(type, loc, num_pp, &status);
pp_rel_path = oskar_mem_create(type, loc, num_pp, &status);
// Pierce points for one station (non-owned oskar_Mem pointers)
oskar_Mem *pp_st_lon, *pp_st_lat, *pp_st_rel_path;
pp_st_lon = oskar_mem_create_alias(0, 0, 0, &status);
pp_st_lat = oskar_mem_create_alias(0, 0, 0, &status);
pp_st_rel_path = oskar_mem_create_alias(0, 0, 0, &status);
int num_times = settings.obs.num_time_steps;
double obs_start_mjd_utc = settings.obs.start_mjd_utc;
double dt_dump = settings.obs.dt_dump_days;
// Binary file meta-data
std::string label1 = "pp_lon";
std::string label2 = "pp_lat";
std::string label3 = "pp_path";
std::string units = "radians";
std::string units2 = "";
oskar_Mem *dims = oskar_mem_create(OSKAR_INT, loc, 2, &status);
/* FIXME is this the correct dimension order ?
* FIXME get the MATLAB reader to respect dimension ordering */
oskar_mem_int(dims, &status)[0] = num_sources;
oskar_mem_int(dims, &status)[1] = num_stations;
const char* filename = settings.ionosphere.pierce_points.filename;
oskar_Binary* h = oskar_binary_create(filename, 'w', &status);
double screen_height_m = settings.ionosphere.TID->height_km * 1000.0;
// printf("Number of times = %i\n", num_times);
// printf("Number of stations = %i\n", num_stations);
void *x_, *y_, *z_;
x_ = oskar_mem_void(oskar_telescope_station_true_x_offset_ecef_metres(tel));
y_ = oskar_mem_void(oskar_telescope_station_true_y_offset_ecef_metres(tel));
z_ = oskar_mem_void(oskar_telescope_station_true_z_offset_ecef_metres(tel));
for (int t = 0; t < num_times; ++t)
{
double t_dump = obs_start_mjd_utc + t * dt_dump; // MJD UTC
double gast = oskar_convert_mjd_to_gast_fast(t_dump + dt_dump / 2.0);
for (int i = 0; i < num_stations; ++i)
{
const oskar_Station* station =
oskar_telescope_station_const(tel, i);
double lon = oskar_station_lon_rad(station);
double lat = oskar_station_lat_rad(station);
double alt = oskar_station_alt_metres(station);
double x_ecef, y_ecef, z_ecef, x_offset, y_offset, z_offset;
if (type == OSKAR_DOUBLE)
{
x_offset = ((double*)x_)[i];
y_offset = ((double*)y_)[i];
z_offset = ((double*)z_)[i];
}
else
{
x_offset = (double)((float*)x_)[i];
y_offset = (double)((float*)y_)[i];
z_offset = (double)((float*)z_)[i];
}
oskar_convert_offset_ecef_to_ecef(1, &x_offset, &y_offset,
&z_offset, lon, lat, alt, &x_ecef, &y_ecef, &z_ecef);
double last = gast + lon;
if (type == OSKAR_DOUBLE)
{
oskar_convert_apparent_ra_dec_to_enu_directions_d(num_sources,
oskar_mem_double_const(oskar_sky_ra_rad_const(sky), &status),
oskar_mem_double_const(oskar_sky_dec_rad_const(sky), &status),
last, lat, oskar_mem_double(hor_x, &status),
oskar_mem_double(hor_y, &status),
oskar_mem_double(hor_z, &status));
}
else
{
oskar_convert_apparent_ra_dec_to_enu_directions_f(num_sources,
oskar_mem_float_const(oskar_sky_ra_rad_const(sky), &status),
oskar_mem_float_const(oskar_sky_dec_rad_const(sky), &status),
last, lat, oskar_mem_float(hor_x, &status),
oskar_mem_float(hor_y, &status),
oskar_mem_float(hor_z, &status));
}
int offset = i * num_sources;
oskar_mem_set_alias(pp_st_lon, pp_lon, offset, num_sources,
&status);
oskar_mem_set_alias(pp_st_lat, pp_lat, offset, num_sources,
&status);
oskar_mem_set_alias(pp_st_rel_path, pp_rel_path, offset,
num_sources, &status);
oskar_evaluate_pierce_points(pp_st_lon, pp_st_lat, pp_st_rel_path,
x_ecef, y_ecef, z_ecef, screen_height_m,
num_sources, hor_x, hor_y, hor_z, &status);
} // Loop over stations.
if (status != 0)
continue;
int index = t; // could be = (num_times * f) + t if we have frequency data
int num_fields = 3;
int num_field_tags = 4;
double freq_hz = 0.0;
int freq_idx = 0;
// Write the header TAGS
oskar_binary_write_int(h, GRP, TIME_IDX, index, t, &status);
oskar_binary_write_double(h, GRP, FREQ_IDX, index, freq_idx, &status);
oskar_binary_write_double(h, GRP, TIME_MJD_UTC, index, t_dump, &status);
oskar_binary_write_double(h, GRP, FREQ_HZ, index, freq_hz, &status);
oskar_binary_write_int(h, GRP, NUM_FIELDS, index, num_fields, &status);
oskar_binary_write_int(h, GRP, NUM_FIELD_TAGS, index, num_field_tags,
&status);
// Write data TAGS (fields)
int field, tagID;
field = 0;
tagID = HEADER_OFFSET + (num_field_tags * field);
oskar_binary_write_mem(h, pp_lon, GRP, tagID + DATA,
index, 0, &status);
oskar_binary_write_mem(h, dims, GRP, tagID + DIMS,
index, 0, &status);
oskar_binary_write(h, OSKAR_CHAR, GRP, tagID + LABEL,
index, label1.size()+1, label1.c_str(), &status);
oskar_binary_write(h, OSKAR_CHAR, GRP, tagID + UNITS,
index, units.size()+1, units.c_str(), &status);
field = 1;
tagID = HEADER_OFFSET + (num_field_tags * field);
oskar_binary_write_mem(h, pp_lat, GRP, tagID + DATA,
index, 0, &status);
oskar_binary_write_mem(h, dims, GRP, tagID + DIMS,
index, 0, &status);
oskar_binary_write(h, OSKAR_CHAR, GRP, tagID + LABEL,
index, label2.size()+1, label2.c_str(), &status);
oskar_binary_write(h, OSKAR_CHAR, GRP, tagID + UNITS,
index, units.size()+1, units.c_str(), &status);
field = 2;
tagID = HEADER_OFFSET + (num_field_tags * field);
oskar_binary_write_mem(h, pp_rel_path, GRP, tagID + DATA,
index, 0, &status);
oskar_binary_write_mem(h, dims, GRP, tagID + DIMS,
index, 0, &status);
oskar_binary_write(h, OSKAR_CHAR, GRP, tagID + LABEL,
index, label3.size()+1, label3.c_str(), &status);
oskar_binary_write(h, OSKAR_CHAR, GRP, tagID + UNITS,
index, units2.size()+1, units2.c_str(), &status);
} // Loop over times
// Close the OSKAR binary file.
oskar_binary_free(h);
// clean up memory
oskar_mem_free(hor_x, &status);
oskar_mem_free(hor_y, &status);
oskar_mem_free(hor_z, &status);
oskar_mem_free(pp_lon, &status);
oskar_mem_free(pp_lat, &status);
oskar_mem_free(pp_rel_path, &status);
oskar_mem_free(pp_st_lon, &status);
oskar_mem_free(pp_st_lat, &status);
oskar_mem_free(pp_st_rel_path, &status);
oskar_mem_free(dims, &status);
oskar_telescope_free(tel, &status);
oskar_sky_free(sky, &status);
// Check for errors.
if (status)
oskar_log_error(log, "Run failed: %s.", oskar_get_error_string(status));
oskar_log_free(log);
return status;
}
void oskar_imager_read_coords_vis(oskar_Imager* h, const char* filename,
int i_file, int num_files, int* percent_done, int* percent_next,
int* status)
{
oskar_Binary* vis_file;
oskar_VisHeader* header;
oskar_Mem *uu, *vv, *ww, *weight, *time_centroid, *time_slice;
int coord_prec, max_times_per_block, tags_per_block, i_block, num_blocks;
int num_times_total, num_stations, num_baselines, num_pols;
double time_start_mjd, time_inc_sec;
if (*status) return;
/* Read the header. */
vis_file = oskar_binary_create(filename, 'r', status);
header = oskar_vis_header_read(vis_file, status);
if (*status)
{
oskar_vis_header_free(header, status);
oskar_binary_free(vis_file);
return;
}
coord_prec = oskar_vis_header_coord_precision(header);
max_times_per_block = oskar_vis_header_max_times_per_block(header);
tags_per_block = oskar_vis_header_num_tags_per_block(header);
num_times_total = oskar_vis_header_num_times_total(header);
num_stations = oskar_vis_header_num_stations(header);
num_baselines = num_stations * (num_stations - 1) / 2;
num_pols = oskar_type_is_matrix(oskar_vis_header_amp_type(header)) ? 4 : 1;
num_blocks = (num_times_total + max_times_per_block - 1) /
max_times_per_block;
time_start_mjd = oskar_vis_header_time_start_mjd_utc(header) * 86400.0;
time_inc_sec = oskar_vis_header_time_inc_sec(header);
/* Set visibility meta-data. */
oskar_imager_set_vis_frequency(h,
oskar_vis_header_freq_start_hz(header),
oskar_vis_header_freq_inc_hz(header),
oskar_vis_header_num_channels_total(header));
oskar_imager_set_vis_phase_centre(h,
oskar_vis_header_phase_centre_ra_deg(header),
oskar_vis_header_phase_centre_dec_deg(header));
/* Create scratch arrays. Weights are all 1. */
uu = oskar_mem_create(coord_prec, OSKAR_CPU, 0, status);
vv = oskar_mem_create(coord_prec, OSKAR_CPU, 0, status);
ww = oskar_mem_create(coord_prec, OSKAR_CPU, 0, status);
time_centroid = oskar_mem_create(OSKAR_DOUBLE,
OSKAR_CPU, num_baselines * max_times_per_block, status);
time_slice = oskar_mem_create_alias(0, 0, 0, status);
weight = oskar_mem_create(h->imager_prec,
OSKAR_CPU, num_baselines * num_pols * max_times_per_block, status);
oskar_mem_set_value_real(weight, 1.0, 0, 0, status);
/* Loop over visibility blocks. */
for (i_block = 0; i_block < num_blocks; ++i_block)
{
int t, num_times, num_channels, start_time, start_chan, end_chan;
int dim_start_and_size[6];
size_t num_rows;
if (*status) break;
/* Read block metadata. */
oskar_timer_resume(h->tmr_read);
oskar_binary_set_query_search_start(vis_file,
i_block * tags_per_block, status);
oskar_binary_read(vis_file, OSKAR_INT,
OSKAR_TAG_GROUP_VIS_BLOCK,
OSKAR_VIS_BLOCK_TAG_DIM_START_AND_SIZE, i_block,
sizeof(dim_start_and_size), dim_start_and_size, status);
start_time = dim_start_and_size[0];
start_chan = dim_start_and_size[1];
num_times = dim_start_and_size[2];
num_channels = dim_start_and_size[3];
num_rows = num_times * num_baselines;
end_chan = start_chan + num_channels - 1;
/* Fill in the time centroid values. */
for (t = 0; t < num_times; ++t)
{
oskar_mem_set_alias(time_slice, time_centroid,
t * num_baselines, num_baselines, status);
oskar_mem_set_value_real(time_slice,
time_start_mjd + (start_time + t + 0.5) * time_inc_sec,
0, num_baselines, status);
}
/* Read the baseline coordinates. */
oskar_binary_read_mem(vis_file, uu, OSKAR_TAG_GROUP_VIS_BLOCK,
OSKAR_VIS_BLOCK_TAG_BASELINE_UU, i_block, status);
oskar_binary_read_mem(vis_file, vv, OSKAR_TAG_GROUP_VIS_BLOCK,
OSKAR_VIS_BLOCK_TAG_BASELINE_VV, i_block, status);
oskar_binary_read_mem(vis_file, ww, OSKAR_TAG_GROUP_VIS_BLOCK,
OSKAR_VIS_BLOCK_TAG_BASELINE_WW, i_block, status);
/* Update the imager with the data. */
oskar_timer_pause(h->tmr_read);
oskar_imager_update(h, num_rows, start_chan, end_chan, num_pols,
uu, vv, ww, 0, weight, time_centroid, status);
*percent_done = (int) round(100.0 * (
(i_block + 1) / (double)(num_blocks * num_files) +
i_file / (double)num_files));
if (h->log && percent_next && *percent_done >= *percent_next)
{
oskar_log_message(h->log, 'S', -2, "%3d%% ...", *percent_done);
*percent_next = 10 + 10 * (*percent_done / 10);
}
}
oskar_mem_free(uu, status);
oskar_mem_free(vv, status);
oskar_mem_free(ww, status);
oskar_mem_free(weight, status);
oskar_mem_free(time_centroid, status);
oskar_mem_free(time_slice, status);
oskar_vis_header_free(header, status);
oskar_binary_free(vis_file);
}
static void oskar_evaluate_station_beam_aperture_array_private(oskar_Mem* beam,
const oskar_Station* s, int num_points, const oskar_Mem* x,
const oskar_Mem* y, const oskar_Mem* z, double gast,
double frequency_hz, oskar_StationWork* work, int time_index,
int depth, int* status)
{
double beam_x, beam_y, beam_z, wavenumber;
oskar_Mem *weights, *weights_error, *theta, *phi, *array;
int num_elements, is_3d;
num_elements = oskar_station_num_elements(s);
is_3d = oskar_station_array_is_3d(s);
weights = work->weights;
weights_error = work->weights_error;
theta = work->theta_modified;
phi = work->phi_modified;
array = work->array_pattern;
wavenumber = 2.0 * M_PI * frequency_hz / 299792458.0;
/* Check if safe to proceed. */
if (*status) return;
/* Compute direction cosines for the beam for this station. */
oskar_evaluate_beam_horizon_direction(&beam_x, &beam_y, &beam_z, s,
gast, status);
/* Evaluate beam if there are no child stations. */
if (!oskar_station_has_child(s))
{
/* First optimisation: A single element model type, and either a common
* orientation for all elements within the station, or isotropic
* elements. */
/* Array pattern and element pattern are separable. */
if (oskar_station_num_element_types(s) == 1 &&
(oskar_station_common_element_orientation(s) ||
oskar_element_type(oskar_station_element_const(s, 0))
== OSKAR_ELEMENT_TYPE_ISOTROPIC) )
{
/* (Always) evaluate element pattern into the output beam array. */
oskar_element_evaluate(oskar_station_element_const(s, 0), beam,
oskar_station_element_x_alpha_rad(s, 0) + M_PI/2.0, /* FIXME Will change: This matches the old convention. */
oskar_station_element_y_alpha_rad(s, 0),
num_points, x, y, z, frequency_hz, theta, phi, status);
/* Check if array pattern is enabled. */
if (oskar_station_enable_array_pattern(s))
{
/* Generate beamforming weights and evaluate array pattern. */
oskar_evaluate_element_weights(weights, weights_error,
wavenumber, s, beam_x, beam_y, beam_z,
time_index, status);
oskar_dftw(num_elements, wavenumber,
oskar_station_element_true_x_enu_metres_const(s),
oskar_station_element_true_y_enu_metres_const(s),
oskar_station_element_true_z_enu_metres_const(s),
weights, num_points, x, y, (is_3d ? z : 0), 0, array,
status);
/* Normalise array response if required. */
if (oskar_station_normalise_array_pattern(s))
oskar_mem_scale_real(array, 1.0 / num_elements, status);
/* Element-wise multiply to join array and element pattern. */
oskar_mem_multiply(beam, beam, array, num_points, status);
}
}
#if 0
/* Second optimisation: Common orientation for all elements within the
* station, but more than one element type. */
else if (oskar_station_common_element_orientation(s))
{
/* Must evaluate array pattern, so check that this is enabled. */
if (!oskar_station_enable_array_pattern(s))
{
*status = OSKAR_ERR_SETTINGS_TELESCOPE;
return;
}
/* Call a DFT using indexed input. */
/* TODO Not yet implemented. */
*status = OSKAR_ERR_FUNCTION_NOT_AVAILABLE;
}
#endif
/* No optimisation: No common element orientation. */
/* Can't separate array and element evaluation. */
else
{
int i, num_element_types;
oskar_Mem *element_block = 0, *element = 0;
const int* element_type_array = 0;
/* Must evaluate array pattern, so check that this is enabled. */
if (!oskar_station_enable_array_pattern(s))
{
*status = OSKAR_ERR_SETTINGS_TELESCOPE;
return;
}
/* Get sized element pattern block (at depth 0). */
element_block = oskar_station_work_beam(work, beam,
num_elements * num_points, 0, status);
/* Create alias into element block. */
element = oskar_mem_create_alias(element_block, 0, 0, status);
/* Loop over elements and evaluate response for each. */
element_type_array = oskar_station_element_types_cpu_const(s);
num_element_types = oskar_station_num_element_types(s);
for (i = 0; i < num_elements; ++i)
{
int element_type_idx;
element_type_idx = element_type_array[i];
if (element_type_idx >= num_element_types)
{
*status = OSKAR_ERR_OUT_OF_RANGE;
break;
}
oskar_mem_set_alias(element, element_block, i * num_points,
num_points, status);
oskar_element_evaluate(
oskar_station_element_const(s, element_type_idx),
element,
oskar_station_element_x_alpha_rad(s, i) + M_PI/2.0, /* FIXME Will change: This matches the old convention. */
oskar_station_element_y_alpha_rad(s, i),
num_points, x, y, z, frequency_hz, theta, phi, status);
}
/* Generate beamforming weights. */
oskar_evaluate_element_weights(weights, weights_error,
wavenumber, s, beam_x, beam_y, beam_z,
time_index, status);
/* Use DFT to evaluate array response. */
oskar_dftw(num_elements, wavenumber,
oskar_station_element_true_x_enu_metres_const(s),
oskar_station_element_true_y_enu_metres_const(s),
oskar_station_element_true_z_enu_metres_const(s),
weights, num_points, x, y, (is_3d ? z : 0),
element_block, beam, status);
/* Free element alias. */
oskar_mem_free(element, status);
/* Normalise array response if required. */
if (oskar_station_normalise_array_pattern(s))
oskar_mem_scale_real(beam, 1.0 / num_elements, status);
}
/* Blank (set to zero) points below the horizon. */
oskar_blank_below_horizon(num_points, z, beam, status);
}
/* If there are child stations, must first evaluate the beam for each. */
else
{
int i;
oskar_Mem* signal;
/* Must evaluate array pattern, so check that this is enabled. */
if (!oskar_station_enable_array_pattern(s))
{
*status = OSKAR_ERR_SETTINGS_TELESCOPE;
return;
}
/* Get sized work array for this depth, with the correct type. */
signal = oskar_station_work_beam(work, beam, num_elements * num_points,
depth, status);
/* Check if child stations are identical. */
if (oskar_station_identical_children(s))
{
/* Set up the output buffer for the first station. */
oskar_Mem* output0;
output0 = oskar_mem_create_alias(signal, 0, num_points, status);
/* Recursive call. */
oskar_evaluate_station_beam_aperture_array_private(output0,
oskar_station_child_const(s, 0), num_points,
x, y, z, gast, frequency_hz, work, time_index,
depth + 1, status);
/* Copy beam for child station 0 into memory for other stations. */
for (i = 1; i < num_elements; ++i)
{
oskar_mem_copy_contents(signal, output0, i * num_points, 0,
oskar_mem_length(output0), status);
}
oskar_mem_free(output0, status);
}
else
{
/* Loop over child stations. */
for (i = 0; i < num_elements; ++i)
{
/* Set up the output buffer for this station. */
oskar_Mem* output;
output = oskar_mem_create_alias(signal, i * num_points,
num_points, status);
/* Recursive call. */
oskar_evaluate_station_beam_aperture_array_private(output,
oskar_station_child_const(s, i), num_points,
x, y, z, gast, frequency_hz, work, time_index,
depth + 1, status);
oskar_mem_free(output, status);
}
}
/* Generate beamforming weights and form beam from child stations. */
oskar_evaluate_element_weights(weights, weights_error, wavenumber,
s, beam_x, beam_y, beam_z, time_index, status);
oskar_dftw(num_elements, wavenumber,
oskar_station_element_true_x_enu_metres_const(s),
oskar_station_element_true_y_enu_metres_const(s),
oskar_station_element_true_z_enu_metres_const(s),
weights, num_points, x, y, (is_3d ? z : 0), signal, beam,
status);
/* Normalise array response if required. */
if (oskar_station_normalise_array_pattern(s))
oskar_mem_scale_real(beam, 1.0 / num_elements, status);
}
}