[1189] | 1 | // |
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| 2 | // C++ Implementation: STPolCircular |
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| 3 | // |
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| 4 | // Description: |
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| 5 | // |
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| 6 | // |
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| 7 | // Author: Malte Marquarding <Malte.Marquarding@csiro.au>, (C) 2006 |
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| 8 | // |
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| 9 | // Copyright: See COPYING file that comes with this distribution |
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| 10 | // |
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| 11 | // |
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| 12 | |
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| 13 | #include <casa/Arrays/ArrayMath.h> |
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| 14 | #include <casa/BasicMath/Math.h> |
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| 15 | #include <casa/Exceptions/Error.h> |
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| 16 | #include <casa/BasicSL/Constants.h> |
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| 17 | #include "STPolCircular.h" |
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| 18 | |
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| 19 | using namespace casa; |
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| 20 | |
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| 21 | namespace asap { |
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| 22 | |
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| 23 | Factory<STPol,STPolCircular> STPolCircular::myFactory; |
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| 24 | |
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| 25 | STPolCircular::~STPolCircular() |
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| 26 | { |
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| 27 | } |
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| 28 | |
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| 29 | |
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| 30 | Vector<Float> asap::STPolCircular::getStokes( uint index ) |
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| 31 | { |
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| 32 | /// @todo implement full stokes support when circular cross pols are available |
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| 33 | Vector<Float> out; |
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| 34 | if (nspec() == 2) { |
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| 35 | if ( index == 0 ) |
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| 36 | out = Vector<Float>(getSpectrum(0) + getSpectrum(1)); |
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[1259] | 37 | else if ( index == 3 ) |
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| 38 | out = Vector<Float>(getSpectrum(0) - getSpectrum(1)); |
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[1189] | 39 | } |
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| 40 | return out; |
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| 41 | } |
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| 42 | |
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| 43 | Vector<Float> asap::STPolCircular::getLinPol( uInt index ) |
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| 44 | { |
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| 45 | if (nspec() != 4) { |
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| 46 | throw(AipsError("You must have 4 circular polarisations to run this function")); |
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| 47 | } |
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| 48 | if ( index < 0 || index >4 ) throw(AipsError("LinPol index out of range")); |
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| 49 | Vector<Float> out,q,u; |
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| 50 | if ( nspec() == 4) { |
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| 51 | switch(index) { |
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| 52 | case 1: |
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| 53 | q = getStokes(1); |
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| 54 | u = getStokes(2); |
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| 55 | out = Vector<Float>(sqrt(pow(q,Float(2.0))+pow(u, Float(2.0)))); |
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| 56 | break; |
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| 57 | case 2: |
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| 58 | q = getStokes(1); |
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| 59 | u = getStokes(2); |
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| 60 | out = Vector<Float>(Float(180.0/C::pi/2.0) * atan2(u,q)); |
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| 61 | break; |
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| 62 | default: |
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| 63 | out = getStokes(index); |
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| 64 | } |
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| 65 | } |
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| 66 | return out; |
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| 67 | } |
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| 68 | |
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| 69 | Vector<Float> asap::STPolCircular::getCircular(uInt index ) |
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| 70 | { |
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| 71 | return getSpectrum(index); |
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| 72 | } |
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| 73 | |
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| 74 | Vector<Float> asap::STPolCircular::getLinear(uInt index ) |
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| 75 | { |
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| 76 | // convert to stokes I/ V first |
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| 77 | // |
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| 78 | // We use the convention |
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| 79 | // I = (XX+YY) // definition changed |
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| 80 | |
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| 81 | if (nspec() != 4) { |
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| 82 | throw(AipsError("You must have 4 circular polarisations to run this function")); |
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| 83 | } |
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| 84 | if ( index == 2 || index ==3 ) throw(AipsError("Re/Imag XY not implemented")); |
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| 85 | Vector<Float> I,V,out; |
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| 86 | I = getStokes(0); |
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| 87 | V = getStokes(3); |
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| 88 | switch(index) { |
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| 89 | case 0: |
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| 90 | out = (I + V)/Float(2.0); |
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| 91 | break; |
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| 92 | case 1: |
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| 93 | out = (I - V)/Float(2.0); |
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| 94 | break; |
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| 95 | default: |
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| 96 | out = Vector<Float>(); |
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| 97 | } |
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| 98 | return out; |
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| 99 | } |
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| 100 | |
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| 101 | } |
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