PBMath1DCosPoly is a 1-D Polynomial Cosine Expansion for a Primary Beam. More...

#include <PBMath1DCosPoly.h>

Inheritance diagram for casa::PBMath1DCosPoly:

Public Member Functions
	PBMath1DCosPoly ()
	PBMath1DCosPoly (const Vector< Double > &coeff, const Vector< Double > &cosScale, 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.
PBMath1DCosPoly &	operator= (const PBMath1DCosPoly &other)
	Instantiation from a row in the Beam subTable PBMath1DCosPoly(const Table& BeamSubTable, Int row, Bool useSymmetricBeam=False);.
	~PBMath1DCosPoly ()
	Clone the object CountedPtr<PBMathInterface> clone();.
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< Double >	coeff_p
Vector< Double >	cosScale_p

Detailed Description

PBMath1DCosPoly is a 1-D Polynomial Cosine Expansion for a Primary Beam.

Intended use:

Public interface

Prerequisite

PBMathInterface class
PBMath1D class

Etymology

PBMath1DCosPoly: derived from PBMath1D, implements a polynomial of Cosines of different widths

Synopsis

PBMath1DCosPoly: a voltage pattern expressed as a polynomial of cosines (all powers of them):

VP(x) = sum_i coeff_i * cos( scale_i * x )^{i}

x is in arcminutes, referenced to 1GHz frequency; the argument of the cosines are in radians

Example

       Vector<Double> cosCoef(4);
       Vector<Double> cosScale(4);
       cosCoef.set(0.0);
       cosScale.set(0.0);
       cosCoef(3) = 1.0;
       cosScale(3) = 0.01891; // 0.01891 = 0.065 * 1000(MHz/GHz) /(60(arcm/deg)) * 2pi/180
       PBMath1DCosPoly cosPB(cosCoef, cosScale,
                             Quantity(1.0, "deg"), 
                             Quantity(1.0, "GHz")  );
       cosPB.applyPB( im3, im4, 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. WSRT uses this model.

To Do

constructor from a MS beam subtable
flush to MS beam subtable

Definition at line 95 of file PBMath1DCosPoly.h.

Constructor & Destructor Documentation

casa::PBMath1DCosPoly::PBMath1DCosPoly ( )

casa::PBMath1DCosPoly::PBMath1DCosPoly	(	const Vector< Double > &	coeff,
		const Vector< Double > &	cosScale,
		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::PBMath1DCosPoly::~PBMath1DCosPoly ( )

Clone the object CountedPtr<PBMathInterface> clone();.

destructor