void Pulsar::RemoveBaseline::Each::transform (Archive* archive)
{
const unsigned nsub = archive->get_nsubint();
const unsigned nchan = archive->get_nchan();
const unsigned npol = archive->get_npol();
bool pscrunch = (archive->get_state() == Signal::Coherence ||
archive->get_state() == Signal::PPQQ);
for (unsigned isub=0; isub < nsub; isub++)
{
Integration* subint = archive->get_Integration (isub);
for (unsigned ichan=0; ichan < nchan; ichan++)
{
Reference::To<Profile> profile = subint->get_Profile (0,ichan);
if (pscrunch)
{
profile = profile->clone();
profile->sum (subint->get_Profile (1,ichan));
}
Reference::To<PhaseWeight> baseline = profile->baseline();
for (unsigned ipol=0; ipol < npol; ipol++)
{
Profile* p = subint->get_Profile(ipol, ichan);
baseline->set_Profile (p);
p->offset (-baseline->get_mean().val);
}
}
}
};
/*! Upon completion, the flux of the archive will be normalized with
respect to the flux of the calibrator, such that a FluxCalibrator
simply scales the archive by the calibrator flux. */
void Pulsar::PolnCalibrator::calibrate (Archive* arch) try
{
if (verbose > 2)
cerr << "Pulsar::PolnCalibrator::calibrate" << endl;
calibration_setup (arch);
if (arch->get_npol() == 4)
{
BackendCorrection correct_backend;
correct_backend (arch);
if (verbose > 2)
cerr << "Pulsar::PolnCalibrator::calibrate Archive::transform" <<endl;
arch->transform (response);
arch->set_poln_calibrated (true);
if (receiver)
{
Receiver* rcvr = arch->get<Receiver>();
if (!rcvr)
throw Error (InvalidState, "Pulsar::PolnCalibrator::calibrate",
"Archive has no Receiver Extension");
rcvr->set_basis_corrected (true);
}
}
else if (arch->get_npol() == 1)
{
if (Archive::verbose)
cerr << "Pulsar::PolnCalibrator::calibrate WARNING"
" calibrating only absolute gain" << endl;
unsigned nsub = arch->get_nsubint ();
unsigned nchan = arch->get_nchan ();
for (unsigned isub=0; isub < nsub; isub++)
{
Integration* subint = arch->get_Integration (isub);
for (unsigned ichan=0; ichan < nchan; ichan++)
{
double gain = abs(det( response[ichan] ));
Profile* profile = subint->get_Profile (0, ichan);
profile -> scale (gain);
profile -> set_weight ( profile->get_weight() / gain );
}
}
}
else
throw Error (InvalidParam, "Pulsar::PolnCalibrator::calibrate",
"Archive::npol == %d not yet implemented", arch->get_npol());
arch->set_scale (Signal::ReferenceFluxDensity);
}
catch (Error& error)
{
throw error += "Pulsar::PolnCalibrator::calibrate";
}
void Pulsar::UVMArchive::load_header (const char* filename)
{
int newscan = 0;
uvm_header* header = new uvm_header;
header_ptr = header;
if (uvm_getheader (filename, &program, &newscan, header) < 0)
throw Error (InvalidState, "Pulsar::UVMArchive::load_header",
"%s is not a UVM archive", filename);
cerr << "newscan=" << newscan << endl;
char buffer[80];
uvm_get_source (header, buffer);
source = buffer;
uvm_get_observatory (header, buffer);
telescope = buffer;
telescope = "Arecibo";
uvm_get_windows (header, buffer);
cerr << "Pulsar::UVMArchive::load_header windows=" << buffer
<< " nwins=" << header->nwins << endl;
centre_frequency = header->obfreq;
bandwidth = header->abandwd;
npol = header->anumsbc;
if (npol == 4)
set_state (Signal::Stokes);
cerr << "anumsbc=" << header->anumsbc << endl;
/*
if (header->apoladd)
npol = 1;
*/
dispersion_measure = header->adm;
rotation_measure = header->arm;
if (header->nwins == 0)
{
nbin = header->apbins;
cerr << "nbin = apbins = " << nbin;
}
else
{
nbin = 0;
for (int iwin=0; iwin < header->nwins; iwin++)
{
cerr << "nbin += " << header->nwbins[iwin] << endl;
nbin += header->nwbins[iwin];
}
}
nchan = 1;
if (Profile::no_amps)
{
cerr << "no amps" << endl;
return;
}
cerr << "date (dddyy)=" << header->date << endl;
cerr << "start sec=" << header->startime << endl;
utc_t utc;
utc.tm_yday = header->date / 100;
utc.tm_year = 1900 + header->date % 100;
utc.tm_min = header->scantime / 60;
utc.tm_sec = header->scantime - utc.tm_min * 60;
utc.tm_hour = utc.tm_min / 60;
utc.tm_min -= utc.tm_hour * 60;
MJD mjd_start (utc);
// load all BasicIntegration attributes and data from filename
uvm_data data;
unsigned loaded_subints = 0;
while (uvm_getdata (program, header, &data) >= 0)
{
loaded_subints ++;
resize (loaded_subints);
Integration* integration = get_Integration(loaded_subints-1);
// cerr << "start usec=" << header->scantime << endl;
epoch = mjd_start + header->scantime * 1e-6;
integration->set_folding_period (header->period);
integration->set_duration (header->period);
integration->set_epoch (epoch);
integration->set_centre_frequency(0, centre_frequency);
// scaleI is the scale to convert to microJy
double scale = header->scaleI * 1e-3;
double offset = header->baseval;
for (unsigned ipol=0; ipol < get_npol(); ipol++)
{
float* amps = integration->get_Profile(ipol, 0) -> get_amps();
for (unsigned ibin=0; ibin < get_nbin(); ibin++)
{
amps[ibin] = (data.data[ipol][ibin] + offset) * scale;
}
}
}
}
void Pulsar::BackendCorrection::operator () (Archive* arch) const try
{
Backend* backend = arch->get<Backend>();
if (!backend || backend->get_corrected())
return;
Signal::State state = arch->get_state();
Signal::Basis basis = arch->get_basis();
Signal::Hand hand = backend->get_hand();
Signal::Argument argument = backend->get_argument();
bool correct_lsb = must_correct_lsb (backend, arch);
if (Archive::verbose > 2)
cerr << "Pulsar::BackendCorrection::operator basis=" << basis
<< " hand=" << hand << " phase=" << argument
<< " lsb=" << correct_lsb << endl;
/*
complex conjugation due to lower sideband downconversion and
backend convention have the same effect; the following lines
effect an exclusive or operation.
*/
if (correct_lsb)
{
if (Archive::verbose > 2)
cerr << "Pulsar::BackendCorrection::operator down conversion" << endl;
if (argument == Signal::Conjugate)
argument = Signal::Conventional;
else
argument = Signal::Conjugate;
}
unsigned npol = arch->get_npol();
if (npol < 2)
return;
bool swap01 = false;
bool flip[4] = { false, false, false, false };
if (npol == 4)
{
if (argument == Signal::Conjugate)
{
if (Archive::verbose > 2)
cerr << "Pulsar::BackendCorrection::operator phase convention" << endl;
if (state == Signal::Stokes && basis == Signal::Circular)
flip[2] = !flip[2]; // Flip Stokes U
else
flip[3] = !flip[3]; // Flip Stokes V or Im[AB]
}
if (hand == Signal::Left)
{
if (Archive::verbose > 2)
cerr << "Pulsar::BackendCorrection::operator hand" << endl;
if (state == Signal::Stokes && basis == Signal::Circular)
flip[2] = !flip[2]; // Flip Stokes U and ...
else if (state == Signal::Stokes && basis == Signal::Linear)
flip[1] = !flip[1]; // Flip Stokes Q and ...
else if (state == Signal::PseudoStokes)
flip[1] = !flip[1]; // Flip AA-BB and ...
flip[3] = !flip[3]; // Flip Stokes V or Im[AB]
}
}
// If state == Coherence or PPQQ ...
if (hand == Signal::Left &&
(state == Signal::Coherence || state == Signal::PPQQ))
swap01 = true;
bool flip_something = false;
for (unsigned ipol=0; ipol < npol; ipol++)
if (flip[ipol])
{
if (Archive::verbose > 2)
cerr << "Pulsar::BackendCorrection::operator flip " << ipol << endl;
flip_something = true;
}
if (swap01 && Archive::verbose > 2)
cerr << "Pulsar::BackendCorrection::operator swap 0 and 1" << endl;
if (flip_something || swap01)
{
for (unsigned isub=0; isub < arch->get_nsubint(); isub++)
{
Integration* integration = arch->get_Integration(isub);
for (unsigned ichan=0; ichan < arch->get_nchan(); ichan++)
{
for (unsigned ipol=0; ipol < npol; ipol++)
if (flip[ipol])
integration->get_Profile(ipol, ichan)->scale(-1);
if (swap01)
integration->expert()->swap_profiles(0, ichan, 1, ichan);
}
}
}
backend->set_corrected ();
}
catch (Error& error)
{
throw error += "Pulsar::BackendCorrection::operator";
}
