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