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xxxxxxxxxx//# VPSkyJones.h: Definitions of interface for VPSkyJones //# Copyright (C) 1996,1997,1998,1999,2000,2002,2003//# Associated Universities, Inc. Washington DC, USA.//#//# This library is free software; you can redistribute it and/or modify it//# under the terms of the GNU Library General Public License as published by//# the Free Software Foundation; either version 2 of the License, or (at your//# option) any later version.//#//# This library is distributed in the hope that it will be useful, but WITHOUT//# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or//# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public//# License for more details.//#//# You should have received a copy of the GNU Library General Public License//# along with this library; if not, write to the Free Software Foundation,//# Inc., 675 Massachusetts Ave, Cambridge, MA 02139, USA.//#//# Correspondence concerning AIPS++ should be adressed as follows://# Internet email: aips2-request@nrao.edu.//# Postal address: AIPS++ Project Office//# National Radio Astronomy Observatory//# 520 Edgemont Road//# Charlottesville, VA 22903-2475 USA//#//#//# $Id$namespace casacore{class Table;}namespace casa { //# NAMESPACE CASA - BEGIN//# Someday, we'll need these forward declarations for Solve in the Jones Matricesclass SkyEquation;class SkyModel;// <summary> Model the diagonal elements of the Voltage Pattern Sky Jones Matrices </summary>// <use visibility=export>// <reviewed reviewer="" date="" tests="" demos="">// <prerequisite>// <li> <linkto class="SkyEquation">SkyEquation</linkto> class// <li> <linkto class="BeamSkyJones">BeamSkyJones</linkto> class// </prerequisite>//// <etymology>// VP = Voltage Pattern, SkyJones = Sky-based Jones matrices.// This class only deals with the diagonal elements of the// voltage pattern jones matrices.// </etymology>//// <synopsis> //// </synopsis> //// <example>// <srcblock>// </srcblock>// </example>//// <motivation>// To deal with the non-leakage voltage pattern as applied to all casacore::Stokes,// and beam squint (ie, errors in casacore::Stokes V caused by differing RR and// LL beams). Polarization leakage beams are in DBeamSkyJones.// The motivation for this split is differing storage requirements// for the unerlying PBMath types, and different methods available// to VPSkyJones and DBeamSkyJones.// </motivation>//// <todo asof="98/09/01">// <li> Solvable part needs implementation: we need to derive an// image of gradients of the elements of the Jones matrix. See VisJones// for how to do this.// </todo>class VPSkyJones : public BeamSkyJones {