Line data    Source code

       1             : // -*- C++ -*-
       2             : //# EVLAAperture.cc: Implementation of the EVLAAperture class
       3             : //# Copyright (C) 1997,1998,1999,2000,2001,2002,2003
       4             : //# Associated Universities, Inc. Washington DC, USA.
       5             : //#
       6             : //# This library is free software; you can redistribute it and/or modify it
       7             : //# under the terms of the GNU Library General Public License as published by
       8             : //# the Free Software Foundation; either version 2 of the License, or (at your
       9             : //# option) any later version.
      10             : //#
      11             : //# This library is distributed in the hope that it will be useful, but WITHOUT
      12             : //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      13             : //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
      14             : //# License for more details.
      15             : //#
      16             : //# You should have received a copy of the GNU Library General Public License
      17             : //# along with this library; if not, write to the Free Software Foundation,
      18             : //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
      19             : //#
      20             : //# Correspondence concerning AIPS++ should be addressed as follows:
      21             : //#        Internet email: casa-feedback@nrao.edu.
      22             : //#        Postal address: AIPS++ Project Office
      23             : //#                        National Radio Astronomy Observatory
      24             : //#                        520 Edgemont Road
      25             : //#                        Charlottesville, VA 22903-2475 USA
      26             : //#
      27             : //# $Id$
      28             : //
      29             : #include <synthesis/TransformMachines/ATerm.h>
      30             : #include <synthesis/TransformMachines/SynthesisError.h>
      31             : #include <casacore/coordinates/Coordinates/DirectionCoordinate.h>
      32             : #include <casacore/coordinates/Coordinates/SpectralCoordinate.h>
      33             : #include <casacore/coordinates/Coordinates/StokesCoordinate.h>
      34             : //
      35             : //---------------------------------------------------------------------
      36             : //
      37             : using namespace casacore;
      38             : namespace casa{
      39             :   
      40           0 :   ATerm::ATerm()
      41           0 :   : CFTerms()
      42             :   {
      43             :     Int userValue;
      44             : 
      45           0 :     cachedOverSampling_p=OVERSAMPLING;
      46           0 :     userValue = SynthesisUtils::getenv("ATerm.OVERSAMPLING",OVERSAMPLING);
      47           0 :     if (userValue != cachedOverSampling_p)
      48             :       {
      49           0 :         cachedOverSampling_p = userValue;
      50             :         //      cerr << "Oversampling set to " << cachedOverSampling_p << endl;
      51             :       }
      52             : 
      53             : 
      54           0 :     cachedConvSize_p=CONVSIZE;
      55           0 :     userValue = SynthesisUtils::getenv("ATerm.CONVSIZE",CONVSIZE);
      56           0 :     if (userValue != cachedConvSize_p)
      57             :       {
      58           0 :         cachedConvSize_p = userValue;
      59             :         //cerr << "ConvFuncSize set to " << cachedConvSize_p << endl;
      60             :       }
      61           0 :   };
      62             : 
      63           0 :   Int ATerm::makePBPolnCoords(//const VisBuffer&vb,
      64             :                               const Vector<Int>& vbCorrType,
      65             :                               const Int& convSize,
      66             :                               const Int& convSampling,
      67             :                               const CoordinateSystem& skyCoord,
      68             :                               const Int& skyNx, const Int& /*skyNy*/,
      69             :                               CoordinateSystem& feedCoord)
      70             :   //                                 Vector<Int>& cfStokes)
      71             :   {
      72           0 :     feedCoord = skyCoord;
      73             :     //
      74             :     // Make a two dimensional image to calculate auto-correlation of
      75             :     // the ideal illumination pattern. We want this on a fine grid in
      76             :     // the UV plane
      77             :     //
      78           0 :     Int directionIndex=skyCoord.findCoordinate(Coordinate::DIRECTION);
      79           0 :     AlwaysAssert(directionIndex>=0, AipsError);
      80           0 :     DirectionCoordinate dc=skyCoord.directionCoordinate(directionIndex);
      81           0 :     Vector<Double> sampling;
      82           0 :     sampling = dc.increment();
      83           0 :     sampling*=Double(convSampling);
      84           0 :     sampling*=Double(skyNx)/Double(convSize);
      85           0 :     dc.setIncrement(sampling);
      86             :     
      87             :     
      88           0 :     Vector<Double> unitVec(2);
      89           0 :     unitVec=convSize/2;
      90           0 :     dc.setReferencePixel(unitVec);
      91             :     
      92             :     // Set the reference value to that of the image
      93           0 :     feedCoord.replaceCoordinate(dc, directionIndex);
      94             : 
      95             :     //
      96             :     // Make an image with circular polarization axis.
      97             :     //
      98           0 :     Int NPol=0,M,N=0;
      99           0 :     M=polMap_p_base.nelements();
     100           0 :     for(Int i=0;i<M;i++) if (polMap_p_base(i) > -1) NPol++;
     101           0 :     Vector<Int> poln(NPol);
     102             :     
     103             :     Int index;
     104           0 :     Vector<Int> inStokes;
     105           0 :     index = feedCoord.findCoordinate(Coordinate::STOKES);
     106           0 :     inStokes = feedCoord.stokesCoordinate(index).stokes();
     107           0 :     N = 0;
     108             :     try
     109             :       {
     110             :         //      cerr << "### " << polMap_p_base << " " << vb.corrType() << endl;
     111           0 :         for(Int i=0;i<M;i++) if (polMap_p_base(i) > -1) {poln(N) = vbCorrType(i);N++;}
     112           0 :         StokesCoordinate polnCoord(poln);
     113           0 :         Int StokesIndex = feedCoord.findCoordinate(Coordinate::STOKES);
     114           0 :         feedCoord.replaceCoordinate(polnCoord,StokesIndex);
     115             :         //      cfStokes = poln;
     116           0 :       }
     117           0 :     catch(AipsError& x)
     118             :       {
     119           0 :         throw(SynthesisFTMachineError("Likely cause: Discrepancy between the poln. "
     120           0 :                                       "axis of the data and the image specifications."));
     121           0 :       }
     122             :     
     123           0 :     return NPol;
     124           0 :   }
     125             : 
     126           0 :   inline Int ATerm::getConvSize() 
     127             :   {
     128           0 :     return cachedConvSize_p;
     129             :     // Int defaultConvSize=CONVSIZE, userValue;
     130             :     // userValue = SynthesisUtils::getenv("ATerm.CONVSIZE",CONVSIZE);
     131             :     // if (userValue != defaultConvSize)
     132             :     //   {
     133             :     //  defaultConvSize = userValue;
     134             :     //  cerr << "ConvFuncSize set to " << defaultConvSize << endl;
     135             :     //   }
     136             :     // return defaultConvSize;
     137             :   };
     138             : 
     139           0 :   inline Int ATerm::getOversampling() 
     140             :   {
     141           0 :     return cachedOverSampling_p;
     142             :     // Int defaultOversampling=OVERSAMPLING, userValue;
     143             :     // userValue = SynthesisUtils::getenv("ATerm.OVERSAMPLING",OVERSAMPLING);
     144             :     // if (userValue != defaultOversampling)
     145             :     //   {
     146             :     //  defaultOversampling = userValue;
     147             :     //  cerr << "Oversampling set to " << defaultOversampling << endl;
     148             :     //   }
     149             :     // return defaultOversampling;
     150             :   }
     151             : };