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1 : //# PBMath1DGauss.h: Definitions of 1-D Gauss PBMath objects
2 : //# Copyright (C) 1996,1997,1998,2003
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: aips2-request@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_PBMATH1DGAUSS_H
30 : #define SYNTHESIS_PBMATH1DGAUSS_H
31 :
32 : #include <casacore/casa/aips.h>
33 : #include <synthesis/TransformMachines/PBMath1D.h>
34 : #include <casacore/measures/Measures.h>
35 :
36 : namespace casa { //# NAMESPACE CASA - BEGIN
37 :
38 : //#forward
39 :
40 : // <summary>
41 : // PBMath1DGauss is a 1-D Gaussian Primary Beam
42 : // </summary>
43 :
44 : // <use visibility=export>
45 :
46 : // <reviewed reviewer="" date="" tests="" demos="">
47 :
48 : // <prerequisite>
49 : // <li> <linkto class="PBMathInterface">PBMathInterface</linkto> class
50 : // <li> <linkto class="PBMath1D">PBMath1D</linkto> class
51 : // </prerequisite>
52 : //
53 : // <etymology>
54 : // PBMath1DGauss: derived from PBMath1D, implements a gaussian PB and VP
55 : // </etymology>
56 : //
57 : // <synopsis>
58 : // See PBMath1D for a general synopsis of the 1D PB types.
59 : // Remember that we construct based on Voltage Patterns rather than
60 : // primary beams. The Voltage Pattern HWHM width will be sqrt(2)
61 : // times larger than the Primary Beam HWHM.
62 : //
63 : // VP(x) = exp( - ( x/HWHM )**2 * log(2) ), out to maximumRadius
64 : // </synopsis>
65 : //
66 : //
67 : // <example>
68 : // <srcblock>
69 : //
70 : // PBMath1DGauss myPB (casacore::Quantity(1.0, "'"),
71 : // casacore::Quantity(3.0, "'"),
72 : // casacore::Quantity(1.0, "GHz"),
73 : // BeamSquint(casacore::MDirection(casacore::Quantity(2.0, "\""),
74 : // casacore::Quantity(0.0, "\""),
75 : // casacore::MDirection::Ref(casacore::MDirection::AZEL)),
76 : // casacore::Quantity(2.0, "GHz")),
77 : // false);
78 : // </srcblock>
79 : // </example>
80 : //
81 : // <motivation>
82 : // All of the 1-D PB types have everything in common except for the
83 : // details of their parameterization. This lightweight class
84 : // deals with those differences: construction, filling the PBArray
85 : // from construction parameters, and flushing to disk.
86 : // BIMA uses a Gaussian PB.
87 : // </motivation>
88 : //
89 : // <todo asof="98/10/21">
90 : // <li> constructor from a casacore::MS beam subtable
91 : // <li> flush to casacore::MS beam subtable
92 : // </todo>
93 :
94 :
95 : class PBMath1DGauss : public PBMath1D {
96 : public:
97 :
98 : PBMath1DGauss();
99 :
100 : // Instantiation from arguments; default = no squint
101 : // squint is the offset from pointing center if the casacore::Stokes R beam
102 : // useSymmetricBeam forces a fit to the squinted beam
103 : // width = Half-Width-Half-max
104 : // maxRad = half-width at zero intensity
105 : PBMath1DGauss( casacore::Quantity halfWidth, casacore::Quantity maxRad, casacore::Quantity refFreq,
106 : casacore::Bool isThisVP=false,
107 : BeamSquint squint=BeamSquint(casacore::MDirection(casacore::Quantity(0.0, "deg"),
108 : casacore::Quantity(0.0, "deg"),
109 : casacore::MDirection::Ref(casacore::MDirection::AZEL)),
110 : casacore::Quantity(1.0, "GHz")),
111 : casacore::Bool useSymmetricBeam=false);
112 :
113 : // Instantiation from a row in the Beam subTable
114 : // PBMath1DGauss(const casacore::Table& BeamSubTable, casacore::Int row,
115 : // casacore::Bool useSymmetricBeam=false);
116 :
117 : // Copy constructor
118 : // PBMath1DGauss(const PBMath1DGauss& other);
119 :
120 : // Assignment operator, by reference
121 : PBMath1DGauss& operator=(const PBMath1DGauss& other);
122 :
123 : // Clone the object
124 : // casacore::CountedPtr<PBMathInterface> clone();
125 :
126 : // destructor
127 : ~PBMath1DGauss();
128 :
129 : // Get the type of PB this is
130 0 : PBMathInterface::PBClass whichPBClass() { return PBMathInterface::GAUSS; }
131 :
132 : // Flush the construction parameters to disk
133 : // casacore::Bool flushToTable(casacore::Table& beamSubTable, casacore::Int iRow);
134 :
135 : // Summarize the construction data for this primary beam
136 : void summary(casacore::Int nValues=0);
137 :
138 : protected:
139 :
140 : // Fill in vp_p array from construction parameters
141 : void fillPBArray();
142 :
143 : private:
144 :
145 : casacore::Quantity halfWidth_p;
146 :
147 : };
148 :
149 :
150 : } //# NAMESPACE CASA - END
151 :
152 : #endif
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