| 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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