1-D Numeric Primary Beam Model More...

#include <PBMath1DNumeric.h>

Inheritance diagram for casa::PBMath1DNumeric:

Public Member Functions
	PBMath1DNumeric ()
	PBMath1DNumeric (const Vector< Float > &numericArray, Quantity maxRad, Quantity refFreq, Bool isThisVP=False, BeamSquint squint=BeamSquint(MDirection(Quantity(0.0,"deg"), Quantity(0.0,"deg"), MDirection::Ref(MDirection::AZEL)), Quantity(1.0,"GHz")), Bool useSymmetricBeam=False)
	Instantiation from arguments; default = no squint squint is the offset from pointing center if the Stokes R beam useSymmetricBeam forces a fit to the squinted beam.
PBMath1DNumeric &	operator= (const PBMath1DNumeric &other)
	Instantiation from a row in the Beam subTable PBMath1DNumeric(const Table& BeamSubTable, Int row, Bool useSymmetricBeam=False);.
	~PBMath1DNumeric ()
	destructor
PBMathInterface::PBClass	whichPBClass ()
	Get the type of PB this is.
void	summary (Int nValues=0)
	Flush the construction parameters to disk Bool flushToTable(Table& beamSubTable, Int iRow);.
Protected Member Functions
void	fillPBArray ()
	Fill in vp_p array from construction parameters.
Private Attributes
Vector< Float >	numericArray_p

Detailed Description

1-D Numeric Primary Beam Model

Intended use:

Public interface

Prerequisite

PBMathInterface class
PBMath1D class

Etymology

PBMath1DNumeric: derived from PBMath1D, implements a numeric PB and VP

Synopsis

See PBMath1D for a general synopsis of the 1D PB types.

The user supplies a vector which is a numerical representation of a voltage [attern (hey, if you have a PB, just take the square root, and look out for sidelobes which could be negative). The first element in the vector needs to be 1.0, the center of the voltage pattern. The last element of the vector is the value of the VP at the maximumRadius. The maximumRadius and the reference frequency at which the tabulated VP is intended are also required for construction. The PBMath1DNumeric constructor proceeds by performing SINC interpolation on the input vector to generate the highly oversampled lookup vector.

Example

       Vector<Float> vp(10);
       vp(0) = 1.0f;
       vp(1) = 0.932f;
       vp(2) = 0.7462f;
       vp(3) = 0.4914f;
       vp(4) = 0.2308f;
       vp(5) = 0.02183f;   // first null
       vp(6) = -0.1005f;
       vp(7) = -0.1318f;
       vp(8) = -0.09458f;
       vp(9) = -0.0269f;
       Quantity maxRad(1.032,"deg");  
       Quantity refFreq(1.414, "GHz");
       PBMath1DNumeric numPB (vp, maxRad, refFreq);
       numPB.applyPB( im1, im2, pointingDir);

Motivation

All of the 1-D PB types have everything in common except for the details of their parameterization. This lightweight class deals with those differences: construction, filling the PBArray from construction parameters, and flushing to disk. The Numeric type is very handy: someone can take a sample illumination pattern, FT, and take a slice of the resulting voltage pattern and construct a Numerical VP from that slice.

To Do

constructor from a MS beam subtable
flush to MS beam subtable

Definition at line 107 of file PBMath1DNumeric.h.

Constructor & Destructor Documentation

casa::PBMath1DNumeric::PBMath1DNumeric ( )

casa::PBMath1DNumeric::PBMath1DNumeric	(	const Vector< Float > &	numericArray,
		Quantity	maxRad,
		Quantity	refFreq,
		Bool	isThisVP = `False`,
		BeamSquint	squint = `BeamSquint(MDirection(Quantity(0.0,"deg"), Quantity(0.0,"deg"), MDirection::Ref(MDirection::AZEL)), Quantity(1.0,"GHz"))`,
		Bool	useSymmetricBeam = `False`
	)

Instantiation from arguments; default = no squint squint is the offset from pointing center if the Stokes R beam useSymmetricBeam forces a fit to the squinted beam.

casa::PBMath1DNumeric::~PBMath1DNumeric ( )

destructor

Member Function Documentation

void casa::PBMath1DNumeric::fillPBArray ( ) [protected, virtual]

Fill in vp_p array from construction parameters.

Implements casa::PBMath1D.

PBMath1DNumeric& casa::PBMath1DNumeric::operator= ( const PBMath1DNumeric & other )

Instantiation from a row in the Beam subTable PBMath1DNumeric(const Table& BeamSubTable, Int row, Bool useSymmetricBeam=False);.

Copy constructor PBMath1DGNumeric(const PBMath1DNumeric& other);

Assignment operator, by reference

void casa::PBMath1DNumeric::summary ( Int nValues = 0 ) [virtual]

Flush the construction parameters to disk Bool flushToTable(Table& beamSubTable, Int iRow);.

Summarize the construction data for this primary beam

Reimplemented from casa::PBMath1D.

PBMathInterface::PBClass casa::PBMath1DNumeric::whichPBClass ( ) [inline, virtual]

Get the type of PB this is.

Implements casa::PBMathInterface.

Definition at line 137 of file PBMath1DNumeric.h.

References casa::PBMathInterface::NUMERIC.

Member Data Documentation

Vector<Float> casa::PBMath1DNumeric::numericArray_p [private]

Definition at line 152 of file PBMath1DNumeric.h.

The documentation for this class was generated from the following file:

code/synthesis/TransformMachines/PBMath1DNumeric.h

Public Member Functions

Protected Member Functions

Private Attributes