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       1             : //# ACoh.h: Definition for ACoh
       2             : //# Copyright (C) 1996,1997,1999,2000
       3             : //# Associated Universities, Inc. Washington DC, USA.
       4             : //#
       5             : //# This library is free software; you can redistribute it and/or modify it
       6             : //# under the terms of the GNU Library General Public License as published by
       7             : //# the Free Software Foundation; either version 2 of the License, or (at your
       8             : //# option) any later version.
       9             : //#
      10             : //# This library is distributed in the hope that it will be useful, but WITHOUT
      11             : //# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12             : //# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
      13             : //# License for more details.
      14             : //#
      15             : //# You should have received a copy of the GNU Library General Public License
      16             : //# along with this library; if not, write to the Free Software Foundation,
      17             : //# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.
      18             : //#
      19             : //# Correspondence concerning AIPS++ should be adressed as follows:
      20             : //#        Internet email: casa-feedback@nrao.edu.
      21             : //#        Postal address: AIPS++ Project Office
      22             : //#                        National Radio Astronomy Observatory
      23             : //#                        520 Edgemont Road
      24             : //#                        Charlottesville, VA 22903-2475 USA
      25             : //#
      26             : //#
      27             : //# $Id$
      28             : 
      29             : #ifndef SYNTHESIS_ACOH_H
      30             : #define SYNTHESIS_ACOH_H
      31             : 
      32             : #include <casacore/casa/aips.h>
      33             : #include <casacore/casa/BasicSL/Complex.h>
      34             : #include <synthesis/MeasurementEquations/Iterate.h>
      35             : #include <msvis/MSVis/VisSet.h>
      36             : 
      37             : namespace casa { //# NAMESPACE CASA - BEGIN
      38             : 
      39             : // <summary> 
      40             : // ACoh: Model additive errors for the VisEquation.
      41             : // </summary>
      42             : 
      43             : // <use visibility=export>
      44             : 
      45             : // <reviewed reviewer="" date="" tests="" demos="">
      46             : 
      47             : // <prerequisite>
      48             : //   <li> <linkto module="MeasurementComponents">MeasurementComponents</linkto> module
      49             : //   <li> <linkto class="VisSet">VisSet</linkto> class
      50             : //   <li> <linkto class="VisEquation">VisEquation</linkto> class
      51             : // </prerequisite>
      52             : //
      53             : // <etymology>
      54             : // ACoh describes an interface for additive errors to be used in
      55             : // the <linkto class="VisEquation">VisEquation</linkto>. It is an Abstract Base Class: most methods
      56             : // must be defined in derived classes.
      57             : // </etymology>
      58             : //
      59             : // <synopsis> 
      60             : //
      61             : // See <linkto class="VisEquation">VisEquation</linkto> for definition of the
      62             : // Visibility Measurement Equation.
      63             : //
      64             : // The following examples illustrate how an ACoh can be
      65             : // used:
      66             : // <ul>
      67             : // <li> Simulation: random additive noise of a certain scaling
      68             : // can be added: <linkto class="SimACoh">SimACoh</linkto>
      69             : // <li> Correlator offsets
      70             : // </ul>
      71             : // </synopsis> 
      72             : //
      73             : // <example>
      74             : // <srcblock>
      75             : //      // Read the VisSet from disk
      76             : //      VisSet vs("3c84.MS");
      77             : //
      78             : //      VisEquation ve(vs);
      79             : //
      80             : //      // Make an ACoh
      81             : //      CorrelatorOffsetACoh coac(vs);
      82             : //
      83             : //      ve.setACoh(coac);
      84             : //
      85             : //      // Correct the visset
      86             : //      ve.correct();
      87             : // </srcblock>
      88             : // </example>
      89             : //
      90             : // <motivation>
      91             : // The properties of an additive component must be described
      92             : // for the <linkto class="VisEquation">VisEquation</linkto>.
      93             : // </motivation>
      94             : //
      95             : // <todo asof="97/10/01">
      96             : // </todo>
      97             : 
      98             : class VisEquation;
      99             : 
     100             : class ACoh  {
     101             : public:
     102           0 :     ACoh() {};
     103           0 :     virtual ~ACoh() {};
     104             :     
     105             :     virtual casacore::Bool solve(VisEquation& ve) = 0;
     106             : 
     107             :     // Apply additive error (Inverse is minus)
     108             :     // <group>
     109             :     virtual VisBuffer& apply(VisBuffer& vb) = 0;
     110             :     virtual VisBuffer& applyInv(VisBuffer& vb) = 0;
     111             :     // </group>
     112             : private:
     113             : };
     114             : 
     115             : 
     116             : } //# NAMESPACE CASA - END
     117             : 
     118             : #endif