[910] | 1 | //
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| 2 | // C++ Implementation: STPolStokes
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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 "STPolStokes.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,STPolStokes> STPolStokes::myFactory;
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| 24 |
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| 25 | STPolStokes::~STPolStokes()
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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::STPolStokes::getStokes( uint index )
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| 31 | {
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| 32 | return getSpectrum(index);
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| 33 | }
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| 34 |
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| 35 | Vector<Float> asap::STPolStokes::getLinPol( uInt index )
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| 36 | {
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| 37 | if ( index < 0 || index >4 ) throw(AipsError("LinPol index out of range"));
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| 38 | Vector<Float> out;
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| 39 | if ( nspec() == 4) {
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| 40 | switch(index) {
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| 41 | case 1:
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| 42 | out = Vector<Float>(sqrt(pow(getSpectrum(1),Float(2.0))
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| 43 | +pow(getSpectrum(2), Float(2.0))));
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| 44 | break;
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| 45 | case 2:
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| 46 | out = Vector<Float>(Float(180.0/C::pi/2.0)
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| 47 | * atan2(getSpectrum(2),getSpectrum(1)));
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| 48 | break;
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| 49 | default:
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| 50 | out = getSpectrum(index);
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| 51 | }
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| 52 | }
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| 53 | return out;
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| 54 | }
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| 55 |
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| 56 | Vector<Float> asap::STPolStokes::getLinear(uInt index )
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| 57 | {
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| 58 | Vector<Float> out;
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| 59 | switch(index) {
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| 60 | case 0:
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[980] | 61 | out = (getSpectrum(0)+getSpectrum(1))/Float(2.0);
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[1007] | 62 | break;
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[910] | 63 | case 1:
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[980] | 64 | out = (getSpectrum(0)-getSpectrum(1))/Float(2.0);
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[910] | 65 | break;
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[1007] | 66 | case 2:
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| 67 | out = getSpectrum(2)/Float(2.0);
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| 68 | break;
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| 69 | case 3:
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| 70 | out = getSpectrum(3)/Float(2.0);
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| 71 | break;
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[910] | 72 | default:
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| 73 | out = Vector<Float>();
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| 74 | }
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| 75 | return out;
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| 76 |
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| 77 | }
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| 78 |
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| 79 | Vector<Float> asap::STPolStokes::getCircular(uInt index )
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| 80 | {
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| 81 | // convert to stokes I/ V first
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| 82 | //
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| 83 | // We use the convention
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| 84 | // I = (RR+LL) // definition changed
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| 85 |
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| 86 | if ( index == 2 || index ==3 ) throw(AipsError("Re/Imag RL not implemented"));
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| 87 | Vector<Float> out;
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| 88 | switch(index) {
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| 89 | case 0:
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[1007] | 90 | out = (getSpectrum(0) + getSpectrum(3))/Float(2.0);
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[910] | 91 | break;
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| 92 | case 1:
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[1007] | 93 | out = (getSpectrum(0) - getSpectrum(3))/Float(2.0);
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[910] | 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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