Model the polarization leakage in the Sky Jones Matrices. More...

#include <DBeamSkyJones.h>

Inheritance diagram for casa::DBeamSkyJones:

Public Member Functions
	DBeamSkyJones (casacore::MeasurementSet &ms, casacore::Bool makeDefaultPBsFromMS=true, const casacore::Quantity &parallacticAngleIncrement=casacore::Quantity(5.0,"deg"), BeamSquint::SquintType doSquint=BeamSquint::NONE)

Type	type ()
	Note that DBeamSkyJones uses BeamSkyJones' "apply" methods. More...

virtual casacore::Bool	isSolveable ()
	Is this solveable? More...

Public Member Functions inherited from casa::BeamSkyJones
	BeamSkyJones (const casacore::Quantity &parallacticAngleIncrement=casacore::Quantity(720.0,"deg"), BeamSquint::SquintType doSquint=BeamSquint::NONE, const casacore::Quantity &skyPositionThreshold=casacore::Quantity(180,"deg"))
	Eventually, the casacore::MS will have all the beam information in its Beam Subtable. More...

virtual	~BeamSkyJones ()=0
	this operator due to position offset More...

virtual void	showState (casacore::LogIO &os)
	Print out information concerning the state of this object. More...

casacore::ImageInterface < casacore::Complex > &	apply (const casacore::ImageInterface< casacore::Complex > &in, casacore::ImageInterface< casacore::Complex > &out, const VisBuffer &vb, casacore::Int row, casacore::Bool forward=true)
	Apply Jones matrix to an image (and adjoint) No "applyInverse" is available from the SkyJones classes, you can get them directly from PBMath or you can get the equivalent effect by dividing by grad grad Chi^2 in ImageSkyModel. More...

casacore::ImageInterface < casacore::Float > &	apply (const casacore::ImageInterface< casacore::Float > &in, casacore::ImageInterface< casacore::Float > &out, const VisBuffer &vb, casacore::Int row)

casacore::ImageInterface < casacore::Float > &	applySquare (const casacore::ImageInterface< casacore::Float > &in, casacore::ImageInterface< casacore::Float > &out, const VisBuffer &vb, casacore::Int row)

SkyComponent &	apply (SkyComponent &in, SkyComponent &out, const VisBuffer &vb, casacore::Int row, casacore::Bool forward=true, casacore::Bool fullspectral=false)
	Apply Jones matrix to a sky component (and adjoint) if fullspectral==True then the output skycomponent will have a TabularSpectrum Spectral Model which will be at all the channel frequencies available in the vb; when False the out SkyComponent is modified using the first channel frequency only. More...

SkyComponent &	applySquare (SkyComponent &in, SkyComponent &out, const VisBuffer &vb, casacore::Int row, casacore::Bool fullspectral=false)

virtual void	reset ()
	Understand if things have changed since last PB application. More...

virtual casacore::Bool	changed (const VisBuffer &vb, casacore::Int row)
	Has this operator changed since the last Application? (or more properly, since the last update()) More...

virtual casacore::Bool	change (const VisBuffer &vb)
	Does the operator change in this visbuffer or since the last call? May not be useful – check it out: m.a.h. More...

virtual casacore::Bool	changedBuffer (const VisBuffer &vb, casacore::Int row1, casacore::Int &row2)
	Does this operator changed in this VisBuffer, starting with row1? If yes, we return in row2, the last row that has the same SkyJones as row1. More...

void	update (const VisBuffer &vb, casacore::Int row)
	Update the FieldID, Telescope, pointingDirection, Parallactic angle info. More...

virtual void	assure (const VisBuffer &vb, casacore::Int row)
	if (changed) {update()} More...

virtual casacore::ImageInterface < casacore::Complex > &	applyGradient (casacore::ImageInterface< casacore::Complex > &result, const VisBuffer &vb, casacore::Int row)
	Apply gradient. More...

virtual SkyComponent &	applyGradient (SkyComponent &result, const VisBuffer &vb, casacore::Int row)

virtual void	initializeGradients ()
	Initialize for gradient search. More...

virtual void	finalizeGradients ()
	Finalize for gradient search. More...

virtual void	addGradients (const VisBuffer &vb, casacore::Int row, const casacore::Float sumwt, const casacore::Float chisq, const casacore::Matrix< casacore::Complex > &c, const casacore::Matrix< casacore::Float > &f)
	Add to Gradient Chisq. More...

virtual casacore::Bool	solve (SkyEquation &se)
	Solve. More...

void	setPBMath (const casacore::String &telescope, PBMath &myPBmath, const casacore::Int &antennaID=-1, const casacore::Int &feedID=-1)
	Manage the PBMath objects. More...

casacore::Bool	getPBMath (casacore::uInt whichAnt, PBMath &myPBMath) const
	get the PBMath object; returns false if that one doesn't exist, true if it does exist and is OK whichAnt is an index into an array of PBMaths, which is different for all telescope/antenna/feed combinations Not sure why we need such a low-level method declared as public, retained to preserve old interface More...

casacore::Bool	getPBMath (const casacore::String &telescope, PBMath &myPBMath, const casacore::Int &antennaID=-1, const casacore::Int &feedID=-1) const
	get the PBMath object; returns false if that one doesn't exist, true if it does exist and is OK antennaID and feedID default to -1 to preserve the old interface TODO: change the interface and make antennaID and feedID the second and third parameter respectively to have a better looking code More...

casacore::Quantity	getPAIncrement ()

casacore::Quantity	getSkyPositionThreshold ()

casacore::Bool	isHomogeneous () const
	Return true if all antennas share a common VP. More...

casacore::ImageRegion *	extent (const casacore::ImageInterface< casacore::Complex > &im, const VisBuffer &vb, const casacore::Int irow=-1, const casacore::Float fPad=1.2, const casacore::Int iChan=0, const SkyJones::SizeType sizeType=SkyJones::COMPOSITE)
	Get the casacore::ImageRegion of the primary beam on an Image for a given pointing Note: casacore::ImageRegion is not necesarily constrained to lie within the image region (for example, if the pointing center is near the edge of the image). More...

casacore::ImageRegion *	extent (const casacore::ImageInterface< casacore::Float > &im, const VisBuffer &vb, const casacore::Int irow=-1, const casacore::Float fPad=1.2, const casacore::Int iChan=0, const SkyJones::SizeType sizeType=SkyJones::COMPOSITE)

virtual void	summary (casacore::Int n=0)
	summarize the PBMaths contained here. More...

casacore::String	telescope ()
	return the telescope it is on at this state More...

virtual casacore::Int	support (const VisBuffer &vb, const casacore::CoordinateSystem &cs)
	Get an idea of the support of the PB in number of pixels. More...

Public Member Functions inherited from casa::SkyJones
	SkyJones ()

virtual	~SkyJones ()
	Destructor. More...

virtual void	setThreshold (const casacore::Float t)

virtual casacore::Float	threshold ()

Additional Inherited Members
Public Types inherited from casa::SkyJones
enum	Type { E, T, F, D }
	Allowed types of VisJones matrices. More...

enum	SizeType { COMPOSITE, POWEROF2, ANY }

Protected Member Functions inherited from casa::BeamSkyJones
casacore::Bool	directionsCloseEnough (const casacore::MDirection &dir1, const casacore::MDirection &dir2) const
	return true if two directions are close enough to consider the operator unchanged, false otherwise More...

casacore::Int	indexTelescope (const casacore::String &compareTelescope, const casacore::Int &compareAntenna=-1, const casacore::Int &compareFeed=-1) const
	return index of compareTelescope, compareAntenna and compareFeed in myTelescopes_p, myAntennaIDs and myFeedIDs; -1 if not found if compareAntenna or compareTelescope is -1, this means that the PBMath class is the same for all antennae/feeds. More...

casacore::MDirection	convertDir (const VisBuffer &vb, const casacore::MDirection &inDir, const casacore::MDirection::Types outType)

Protected Member Functions inherited from casa::SkyJones
virtual casacore::String	typeName ()
	Could be over-ridden if necessary. More...

Protected Attributes inherited from casa::BeamSkyJones
casacore::String	telescope_p

casacore::CountedPtr < VisBufferUtil >	vbutil_p

Protected Attributes inherited from casa::SkyJones
casacore::Float	threshold_p

Detailed Description

Model the polarization leakage in the Sky Jones Matrices.

Intended use:

Public interface

Prerequisite

SkyEquation class
BeamSkyJones class

Etymology

DBeam = sky-position-dependent polarization leakage, SkyJones = Sky-based Jones matrices. This class only deals with the off-diagonal elements of the primary beam jones matrices.

Synopsis

Example

Motivation

To deal with the polarization leakage beam (mainly casacore::Stokes I into polarization visibilities). The main primary beam response, ie, the diagonal Jones matrix elements, are handled by VPSkyJones. The motivation for this split is differing storage requirements for the unerlying PBMath types, and different methods available to VPSkyJones and DBeamSkyJones.

To Do

Waiting for PBMath2D, which requires an HGEOM-like utility. We can do nothing here until this is in place.
Need to check the history that PB has been applied before applying DB (or at least provide for some sort of checking.)
Details of APPLY procedure may need to be modified

Definition at line 88 of file DBeamSkyJones.h.

Constructor & Destructor Documentation

casa::DBeamSkyJones::DBeamSkyJones	(	casacore::MeasurementSet &	ms,
		casacore::Bool	makeDefaultPBsFromMS = `true`,
		const casacore::Quantity &	parallacticAngleIncrement = `casacore::Quantity(5.0,"deg")`,
		BeamSquint::SquintType	doSquint = `BeamSquint::NONE`
	)

Member Function Documentation

virtual casacore::Bool casa::DBeamSkyJones::isSolveable ( )

inlinevirtual

Is this solveable?

Reimplemented from casa::BeamSkyJones.

Definition at line 103 of file DBeamSkyJones.h.

Type casa::DBeamSkyJones::type ( )

inlinevirtual

Note that DBeamSkyJones uses BeamSkyJones' "apply" methods.

return SkyJones type

Reimplemented from casa::BeamSkyJones.

Definition at line 100 of file DBeamSkyJones.h.

References casa::SkyJones::D.

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

casa/code/synthesis/TransformMachines/DBeamSkyJones.h

Public Member Functions

Additional Inherited Members