| 1 | //#---------------------------------------------------------------------------
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| 2 | //# SDPol.h: Polarimetric processing
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| 3 | //#---------------------------------------------------------------------------
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| 4 | //# Copyright (C) 2004
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| 5 | //# ATNF
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| 6 | //#
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| 7 | //# This program is free software; you can redistribute it and/or modify it
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| 8 | //# under the terms of the GNU General Public License as published by the Free
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| 9 | //# Software Foundation; either version 2 of the License, or (at your option)
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| 10 | //# any later version.
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| 11 | //#
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| 12 | //# This program is distributed in the hope that it will be useful, but
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| 13 | //# WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | //# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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| 15 | //# Public License for more details.
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| 16 | //#
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| 17 | //# You should have received a copy of the GNU General Public License along
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| 18 | //# with this program; if not, write to the Free Software Foundation, Inc.,
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| 19 | //# 675 Massachusetts Ave, Cambridge, MA 02139, USA.
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| 20 | //#
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| 21 | //# Correspondence concerning this software should be addressed as follows:
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| 22 | //# Internet email: Malte.Marquarding@csiro.au
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| 23 | //# Postal address: Malte Marquarding,
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| 24 | //# Australia Telescope National Facility,
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| 25 | //# P.O. Box 76,
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| 26 | //# Epping, NSW, 2121,
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| 27 | //# AUSTRALIA
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| 28 | //#
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| 29 | //# $Id:
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| 30 | //#---------------------------------------------------------------------------
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| 31 | #ifndef SDPOL_H
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| 32 | #define SDPOL_H
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| 33 |
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| 34 | //# Includes
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| 35 | #include <casa/aips.h>
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| 36 | #include <casa/Arrays/Array.h>
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| 37 | #include <casa/Arrays/ArrayMath.h>
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| 38 | #include <casa/Arrays/ArrayLogical.h>
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| 39 | #include <measures/Measures/Stokes.h>
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| 40 | #include <tables/Tables/BaseMappedArrayEngine.h>
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| 41 |
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| 42 |
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| 43 | namespace asap {
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| 44 |
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| 45 | class SDStokesEngine : public casa::BaseMappedArrayEngine<casa::Float, casa::Float>
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| 46 | {
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| 47 | //# Make members of parent class known.
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| 48 | public:
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| 49 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::virtualName;
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| 50 | protected:
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| 51 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::storedName;
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| 52 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::table;
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| 53 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::roColumn;
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| 54 | using casa::BaseMappedArrayEngine<casa::Float,casa::Float>::rwColumn;
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| 55 |
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| 56 | public:
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| 57 | // Construct engine. The sourveColumnName holds the XX,YY,R(XY),I(XY)
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| 58 | // correlations
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| 59 | SDStokesEngine (const casa::String& virtualColumnName,
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| 60 | const casa::String& sourceColumnName);
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| 61 |
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| 62 | // Construct from a record specification as created by getmanagerSpec().
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| 63 | SDStokesEngine (const casa::Record& spec);
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| 64 |
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| 65 | // Destructor is mandatory.
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| 66 | ~SDStokesEngine();
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| 67 |
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| 68 | // Return the type name of the engine (i.e. its class name).
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| 69 | virtual casa::String dataManagerType() const;
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| 70 |
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| 71 | // Get the name given to the engine (is the source column name).
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| 72 | virtual casa::String dataManagerName() const;
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| 73 |
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| 74 | // casa::Record a casa::Record containing data manager specifications.
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| 75 | virtual casa::Record dataManagerSpec() const;
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| 76 |
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| 77 | // Return the name of the class.
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| 78 | // This includes the names of the template arguments.
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| 79 | static casa::String className();
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| 80 |
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| 81 | // The engine can access column cells.
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| 82 | virtual casa::Bool canAccessArrayColumnCells (casa::Bool& reask) const;
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| 83 |
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| 84 | // Register the class name and the static makeObject "constructor".
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| 85 | // This will make the engine known to the table system.
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| 86 | // The automatically invoked registration function in DataManReg.cc
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| 87 | // contains SDStokesEngine
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| 88 | // Any other instantiation of this class must be registered "manually"
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| 89 | // (or added to DataManReg.cc).
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| 90 | static void registerClass();
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| 91 |
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| 92 | // Non writable
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| 93 | // virtual casa::Bool isWritable () const {return casa::False;}
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| 94 |
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| 95 | private:
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| 96 | // Copy constructor is only used by clone().
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| 97 | // (so it is made private).
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| 98 | SDStokesEngine (const SDStokesEngine&);
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| 99 |
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| 100 | // Assignment is not needed and therefore forbidden
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| 101 | // (so it is made private and not implemented).
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| 102 | SDStokesEngine& operator=(const SDStokesEngine&);
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| 103 |
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| 104 | // Clone the engine object.
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| 105 | DataManager* clone() const;
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| 106 |
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| 107 | // Initialize the object for a new table.
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| 108 | // It defines the keywords containing the engine parameters.
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| 109 | void create (casa::uInt initialNrrow);
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| 110 |
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| 111 | // Preparing consists of setting the writable switch and
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| 112 | // adding the initial number of rows in case of create.
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| 113 | // Furthermore it reads the keywords containing the engine parameters.
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| 114 | void prepare();
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| 115 |
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| 116 | // Get an array in the given row.
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| 117 | void getArray (casa::uInt rownr, casa::Array<casa::Float>& array);
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| 118 |
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| 119 | // Exception
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| 120 | void putArray (casa::uInt rownr, const casa::Array<casa::Float>& array);
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| 121 |
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| 122 | // Compute Stokes parameters
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| 123 | void computeOnGet (casa::Array<casa::Float>& array,
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| 124 | const casa::Array<casa::Float>& target);
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| 125 |
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| 126 | // Get shape
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| 127 | virtual casa::IPosition shape (casa::uInt rownr);
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| 128 |
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| 129 | // Convert input to output (virtual) shape
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| 130 | casa::IPosition findOutputShape (const casa::IPosition& inputShape) const;
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| 131 |
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| 132 |
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| 133 | public:
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| 134 | //*display 4
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| 135 | // Define the "constructor" to construct this engine when a
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| 136 | // table is read back.
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| 137 | // This "constructor" has to be registered by the user of the engine.
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| 138 | // If the engine is commonly used, its registration can be added
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| 139 | // to the registerAllCtor function in DataManReg.cc.
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| 140 | // That function gets automatically invoked by the table system.
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| 141 | static DataManager* makeObject (const casa::String& dataManagerType,
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| 142 | const casa::Record& spec);
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| 143 | };
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| 144 |
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| 145 |
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| 146 |
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| 147 | class SDPolUtil
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| 148 | {
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| 149 | public:
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| 150 | // Convert Q and U to linearly polarized intensity
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| 151 | static casa::Array<casa::Float> polarizedIntensity (const casa::Array<casa::Float>& Q,
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| 152 | const casa::Array<casa::Float>& U);
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| 153 | // Convert Q and U to linearly polarized position angle (degrees)
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| 154 | static casa::Array<casa::Float> positionAngle (const casa::Array<casa::Float>& Q,
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| 155 | const casa::Array<casa::Float>& U);
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| 156 |
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| 157 | // Rotate phase of Complex correlation R+iI by phase (degrees)
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| 158 | static void rotatePhase (casa::Array<casa::Float>& R,
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| 159 | casa::Array<casa::Float>& I,
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| 160 | casa::Float phase);
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| 161 |
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| 162 | // Rotate phase of P=(Q+iU) by phase (degrees), but do this by applying
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| 163 | // the corrections to the raw linear polarizations
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| 164 | static void rotateLinPolPhase (casa::Array<casa::Float>& C1,
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| 165 | casa::Array<casa::Float>& C2,
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| 166 | casa::Array<casa::Float>& C3,
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| 167 | casa::Array<casa::Float>& I,
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| 168 | casa::Array<casa::Float>& Q,
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| 169 | casa::Array<casa::Float>& U,
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| 170 | casa::Float phase);
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| 171 |
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| 172 | // Get Stokes slices from the Array. Start and End should
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| 173 | // already be setup to access the Array at the current cursor location
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| 174 | // (beam, IF, Pol; see SDMemTable). The desired Stokes
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| 175 | // is specified in the string from "I", "Q", "U", "V"
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| 176 | static casa::Array<casa::Float> getStokesSlice (casa::Array<casa::Float>& input, const casa::IPosition& start,
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| 177 | const casa::IPosition& end, const casa::String& stokes);
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| 178 |
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| 179 | // Compute Circular polarization RR or LL from I and V
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| 180 | static casa::Array<casa::Float> circularPolarizationFromStokes (casa::Array<casa::Float>& I,
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| 181 | casa::Array<casa::Float>& V,
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| 182 | casa::Bool doRR);
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| 183 |
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| 184 |
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| 185 | // Compute value for auxilliary spectra when converting to Stokes parameters.
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| 186 | // This combines the raw correlation values, according to what was combined
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| 187 | // to actually convert to Stokes parameters. The output shape may change from
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| 188 | // the input shape according to
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| 189 | // XX or YY -> I (1 -> 1)
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| 190 | // XX,YY -> I (2 -> 1)
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| 191 | // XX,YY,R(XY),I(XY) -> I,Q,U,V (4 -> 4)
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| 192 | //
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| 193 | // It is meant for tSys (FLoat) and masks (Bool or uChar)
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| 194 | // The input array must be of shape [nBeam,nIF,nPol,nChan]
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| 195 | template <class T>
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| 196 | static casa::Array<T> stokesData (casa::Array<T>& rawData, casa::Bool doLinear);
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| 197 |
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| 198 | // Find the number of STokes parameters given the input number
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| 199 | // of raw polarizations
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| 200 | static casa::uInt numberStokes (casa::uInt nPol) {casa::uInt nOut = nPol; if (nPol==2) nOut = 1; return nOut;};
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| 201 |
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| 202 | // Find the Stokes type for the given polarization axis (0,1,2,3)
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| 203 | // You can ask for STokes or raw correlations (linear or circular)
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| 204 | static casa::Stokes::StokesTypes convertStokes(casa::Int val, casa::Bool toStokes,
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| 205 | casa::Bool linear);
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| 206 |
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| 207 | // Return a label for the given polarization index (0-3).
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| 208 | static casa::String polarizationLabel (casa::uInt polIdx, casa::Bool linear,
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| 209 | casa::Bool stokes, casa::Bool linPol);
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| 210 |
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| 211 |
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| 212 | // These two functions are explicitly for the SDWriter
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| 213 | //
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| 214 | // Compute value for auxilliary spectra (Tsys and flags) when converting to Stokes parameters.
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| 215 | // This combines the raw correlation values, according to what was combined
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| 216 | // to actually convert to Stokes parameters. The output shape may change from
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| 217 | // the input shape according to
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| 218 | // XX or YY -> I (1 -> 1)
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| 219 | // XX,YY -> I (2 -> 1)
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| 220 | // XX,YY,R(XY),I(XY) -> I,Q,U,V (4 -> 4)
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| 221 | //
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| 222 | // The input array must be of shape [nChan,nPol] (flags)
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| 223 | // The input array must be of shape [nPol] (tSys)
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| 224 | //
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| 225 | static casa::Array<casa::uChar> computeStokesFlagsForWriter (casa::Array<casa::uChar>& rawData, casa::Bool doLinear)
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| 226 | {return computeStokesDataForWriter(rawData,doLinear);};
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| 227 | static casa::Array<casa::Float> computeStokesTSysForWriter (casa::Array<casa::Float>& rawData, casa::Bool doLinear)
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| 228 | {return computeStokesDataForWriter(rawData,doLinear);};
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| 229 |
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| 230 | // This function is explicitly for SDWriter. It extracts the Beam and IF slice (specified in start
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| 231 | // and end - must be length 1 in beam and IF) and flips the pol and channel axes.
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| 232 | static casa::Array<casa::Float> extractStokesForWriter (casa::Array<casa::Float>& in, const casa::IPosition& start,
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| 233 | const casa::IPosition& end);
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| 234 |
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| 235 | private:
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| 236 | // Return a label for the given StokesType
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| 237 | static casa::String stokesString (casa::Stokes::StokesTypes stokes);
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| 238 |
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| 239 | // specializations
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| 240 | static casa::Array<casa::Float> andArrays (const casa::Array<casa::Float>& in1,
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| 241 | const casa::Array<casa::Float>& in2)
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| 242 | {return (in1+in2)/casa::Float(2.0);}
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| 243 | static casa::Array<casa::Bool> andArrays (const casa::Array<casa::Bool>& in1,
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| 244 | const casa::Array<casa::Bool>& in2)
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| 245 | {return in1&&in2;}
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| 246 | static casa::Array<casa::uChar> andArrays (const casa::Array<casa::uChar>& in1,
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| 247 | const casa::Array<casa::uChar>& in2);
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| 248 |
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| 249 | template <class T>
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| 250 | static casa::Array<T> computeStokesDataForWriter (casa::Array<T>& rawData, casa::Bool doLinear);
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| 251 | };
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| 252 |
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| 253 |
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| 254 |
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| 255 |
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| 256 |
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| 257 | } // namespace
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| 258 |
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| 259 | #endif
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