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#ifndef DFT_PREDICTION_ALGORITHM_H
#define DFT_PREDICTION_ALGORITHM_H
#include "banddata.h"
#include "matrix2x2.h"
#include "polarization.h"
#include "uvector.h"
#include "wsclean/imagebufferallocator.h"
#include "lofar/lbeamevaluator.h"
#include <cmath>
#include <vector>
#include <complex>
/**
* Structure:
* - PredictionImage: images[4] -- collects the model images.
* - PredictionInput: components[nComponents] -- made from image, used as input for prediction.
* - PredictionComponent: l, m, flux[nChannel x 4], antennaBeamValues[nAntenna] (these are updated per timestep)
* - DFTAntennaInfo: beamValuesPerChannel[nChannel] of Matrix2x2
*/
class DFTAntennaInfo
{
public:
const MC2x2& BeamValue(size_t channelIndex) const { return _beamValuesPerChannel[channelIndex]; }
MC2x2& BeamValue(size_t channelIndex) { return _beamValuesPerChannel[channelIndex]; }
std::vector<MC2x2>::iterator begin() { return _beamValuesPerChannel.begin(); }
std::vector<MC2x2>::iterator end() { return _beamValuesPerChannel.end(); }
size_t ChannelCount() const { return _beamValuesPerChannel.size(); }
void InitializeChannelBuffers(size_t channelCount) { _beamValuesPerChannel.resize(channelCount); }
void SetUnitaryBeam() {
for(MC2x2& m : _beamValuesPerChannel)
m = MC2x2::Unity();
}
private:
std::vector<MC2x2> _beamValuesPerChannel;
};
class DFTPredictionComponent
{
public:
DFTPredictionComponent() :
_ra(0.0), _dec(0.0), _l(0.0), _m(0.0), _lmSqrt(0.0),
_isGaussian(false)
{ }
DFTPredictionComponent(double ra, double dec, double l, double m, std::complex<double> fluxLinear[4], size_t channelCount) :
_ra(ra), _dec(dec), _l(l), _m(m), _lmSqrt(sqrt(1.0 - l*l - m*m)),
_isGaussian(false),
_flux(channelCount)
{
for(size_t ch=0; ch!=channelCount; ++ch)
{
for(size_t p=0; p!=4; ++p) _flux[ch][p] = fluxLinear[p];
}
}
void SetPosition(double ra, double dec, double l, double m)
{
_ra = ra; _dec = dec;
_l = l; _m = m;
_lmSqrt = sqrt(1.0 - l*l - m*m);
}
void SetGaussianInfo(double positionAngle, double major, double minor)
{
initializeGaussian(positionAngle, major, minor);
}
void SetChannelCount(size_t channelCount) { _flux.resize(channelCount); }
void SetFlux(const std::vector<MC2x2>& fluxPerChannel)
{
_flux = fluxPerChannel;
}
double L() const { return _l; }
double M() const { return _m; }
double RA() const { return _ra; }
double Dec() const { return _dec; }
double LMSqrt() const { return _lmSqrt; }
bool IsGaussian() const { return _isGaussian; }
const double* GausTransformationMatrix() const { return _gausTransf; }
const DFTAntennaInfo& AntennaInfo(size_t antennaIndex) const { return _beamValuesPerAntenna[antennaIndex]; }
DFTAntennaInfo& AntennaInfo(size_t antennaIndex) { return _beamValuesPerAntenna[antennaIndex]; }
MC2x2& LinearFlux(size_t channelIndex) { return _flux[channelIndex]; }
const MC2x2& LinearFlux(size_t channelIndex) const { return _flux[channelIndex]; }
size_t AntennaCount() const { return _beamValuesPerAntenna.size(); }
void InitializeBeamBuffers(size_t antennaCount, size_t channelCount)
{
_beamValuesPerAntenna.resize(antennaCount);
for(std::vector<DFTAntennaInfo>::iterator a = _beamValuesPerAntenna.begin(); a!=_beamValuesPerAntenna.end(); ++a)
a->InitializeChannelBuffers(channelCount);
}
void SetUnitaryBeam() {
for(std::vector<DFTAntennaInfo>::iterator a = _beamValuesPerAntenna.begin(); a!=_beamValuesPerAntenna.end(); ++a)
a->SetUnitaryBeam();
}
private:
void initializeGaussian(double positionAngle, double majorAxis, double minorAxis)
{
// Using the FWHM formula for a Gaussian:
double sigmaMaj = majorAxis / (2.0L * sqrtl(2.0L * logl(2.0L)));
double sigmaMin = minorAxis / (2.0L * sqrtl(2.0L * logl(2.0L)));
// Position angle is angle from North:
// (TODO this and next statements can be optimized to remove add)
double
paSin = std::sin(positionAngle+0.5*M_PI),
paCos = std::cos(positionAngle+0.5*M_PI);
// Make rotation matrix
long double transf[4];
transf[0] = paCos;
transf[1] = -paSin;
transf[2] = paSin;
transf[3] = paCos;
// Multiply with scaling matrix to make variance 1.
// sigmamaj/min are multiplications and include pi^2 factor, because the sigma
// of the Fourier transform of a Gaus is 1/sigma of the normal Gaus and has a sqrt(2 pi^2) factor.
_gausTransf[0] = transf[0] * sigmaMaj * M_PI * sqrt(2.0);
_gausTransf[1] = transf[1] * sigmaMaj * M_PI * sqrt(2.0);
_gausTransf[2] = transf[2] * sigmaMin * M_PI * sqrt(2.0);
_gausTransf[3] = transf[3] * sigmaMin * M_PI * sqrt(2.0);
_isGaussian = true;
}
double _ra, _dec, _l, _m, _lmSqrt;
bool _isGaussian;
double _gausTransf[4];
std::vector<MC2x2> _flux;
std::vector<DFTAntennaInfo> _beamValuesPerAntenna;
};
class DFTPredictionInput
{
public:
typedef std::vector<DFTPredictionComponent>::iterator iterator;
typedef std::vector<DFTPredictionComponent>::const_iterator const_iterator;
DFTPredictionInput() { }
void InitializeFromModel(const class Model& model, long double phaseCentreRA, long double phaseCentreDec, const BandData& band);
void AddComponent(const DFTPredictionComponent& component)
{
_components.emplace_back(component);
}
DFTPredictionComponent& AddComponent()
{
_components.emplace_back();
return _components.back();
}
size_t ComponentCount() const { return _components.size(); }
void InitializeBeamBuffers(size_t antennaCount, size_t channelCount) {
for(iterator c=begin(); c!=end(); ++c)
c->InitializeBeamBuffers(antennaCount, channelCount);
}
void SetUnitaryBeam() {
for(iterator c=begin(); c!=end(); ++c)
c->SetUnitaryBeam();
}
void ConvertApparentToAbsolute(casacore::MeasurementSet& ms);
const_iterator begin() const { return _components.begin(); }
const_iterator end() const { return _components.end(); }
iterator begin() { return _components.begin(); }
iterator end() { return _components.end(); }
private:
std::vector<DFTPredictionComponent> _components;
};
class DFTPredictionImage
{
public:
DFTPredictionImage(size_t width, size_t height, ImageBufferAllocator& allocator);
void Add(PolarizationEnum polarization, const double* image);
void Add(PolarizationEnum polarization, const double* real, const double* imaginary);
void FindComponents(DFTPredictionInput& destination, double phaseCentreRA, double phaseCentreDec, double pixelSizeX, double pixelSizeY, double dl, double dm, size_t channelCount);
private:
size_t _width, _height;
ImageBufferAllocator* _allocator;
ImageBufferAllocator::Ptr _images[4];
std::vector<PolarizationEnum> _pols;
};
class DFTPredictionAlgorithm
{
public:
DFTPredictionAlgorithm(DFTPredictionInput& input, const BandData& band) : _input(input), _band(band), _hasBeam(false)
{ }
void Predict(MC2x2& dest, double u, double v, double w, size_t channelIndex, size_t a1, size_t a2);
void UpdateBeam(LBeamEvaluator& beamEvaluator, size_t startChannel, size_t endChannel);
private:
void predict(MC2x2& dest, double u, double v, double w, size_t channelIndex, size_t a1, size_t a2, const DFTPredictionComponent& component);
DFTPredictionInput& _input;
BandData _band;
bool _hasBeam;
};
#endif
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