PolnReshape.h

//-*-C++-*-
 
/***************************************************************************
 *
 *   Copyright (C) 2015 by Matthew Kerr
 *   Licensed under the Academic Free License version 2.1
 *
 ***************************************************************************/
 
#ifndef __baseband_dsp_PolnReshape_h
#define __baseband_dsp_PolnReshape_h
 
#include "dsp/Transformation.h"
#include "dsp/TimeSeries.h"
 
// Detection is handled very efficiently on the GPU for 2pol, analytic data.
// But other formats may be more useful down the signal path.  This
// Transformation allows post-detection conversion from 2pol,2dim data to
// a variety of formats:
 
// In the 2pol, 2dim case the coherency parameters are packed such that
// AA and BB are the 2 dimensions of a sample in the pol=0 stream, and
// AB and BA* are the 2 dimensions of a sample in the pol=1 stream.
 
// npol=4, ndim = 1: Coherence / Stokes
// npol=2, ndim = 1: PPQQ
// npol=1, ndim = 1: Intensity
 
// The transformation performed is determined uniquely by the output state.
 
namespace dsp
{
  class PolnReshape : public Transformation<TimeSeries,TimeSeries>
  {
 
  public:
 
    PolnReshape ();
 
    void transformation ();
 
    void set_state ( Signal::State _state) { state = _state; }
 
  protected:
 
    Signal::State state;
 
    void p2d2_p4d1();
 
    void p2d2_p2d1();
 
    void p2d2_p1d1();
 
    void p1d1_p1d1();
 
  };
}
 
#endif