Pulsar::Receiver::Linear Class Reference

Stores the X and Y receptor and calibrator orientations. More...

#include <Receiver_Linear.h>

Inheritance diagram for Pulsar::Receiver::Linear:

Public Member Functions
	Linear ()
	Default constructor.
Signal::Basis	get_basis () const
	Get the basis of the feed receptors.
Signal::Hand	get_hand () const
	Get the hand of the basis.
Angle	get_orientation () const
	Get the orientation of the basis about the line of sight.
Angle	get_reference_source_phase () const
	Get the phase of the reference source.
void	copy (const State *)
	Copy the state from another.
Angle	get_X_offset () const
	Get the offset of the feed X axis with respect to the platform zero.
void	set_X_offset (const Angle &offset)
	Set the offset of the feed X axis with respect to the platform zero.
Angle	get_Y_offset () const
	Get the offset of the feed Y axis from its nominal value.
void	set_Y_offset (const Angle &offset)
	Set the offset of the feed Y axis from its nominal value.
Angle	get_calibrator_offset () const
	Get the offset of the feed calibrator axis from its nominal value.
void	set_calibrator_offset (const Angle &offset)
	Set the offset of the feed calibrator axis from its nominal value.
Public Member Functions inherited from Reference::Able
	Able (const Able &)
Able &	operator= (const Able &)
unsigned	get_reference_count () const
Public Member Functions inherited from Reference::HeapTracked
	HeapTracked (const HeapTracked &)
HeapTracked &	operator= (const HeapTracked &)
bool	__is_on_heap () const

Protected Attributes
bool	y_offset
	Set true if the Y-axis is offset by 180 degrees.
bool	calibrator_offset
	Set true if the calibrator is offset by 90 degrees.
Angle	x_offset
	The orientation of the x-asis about the line of sight.

Additional Inherited Members
Static Public Member Functions inherited from Reference::Able
static size_t	get_instance_count ()
Static Public Member Functions inherited from Reference::HeapTracked
static void *	operator new (size_t size, void *ptr=0)
static void	operator delete (void *location, void *ptr)
static void	operator delete (void *location)
static size_t	get_heap_queue_size ()
Protected Member Functions inherited from Reference::Able
Handle *	__reference (bool active) const
void	__dereference (bool auto_delete=true) const

Detailed Description

Stores the X and Y receptor and calibrator orientations.

Member Function Documentation

copy()

void Pulsar::Receiver::Linear::copy ( const State * state )

virtual

Copy the state from another.

Implements Pulsar::Receiver::State.

References calibrator_offset, Pulsar::Receiver::set_calibrator_offset(), Pulsar::Receiver::state, x_offset, and y_offset.

get_basis()

Signal::Basis Pulsar::Receiver::Linear::get_basis ( ) const

virtual

Get the basis of the feed receptors.

Implements Pulsar::Receiver::State.

get_hand()

Signal::Hand Pulsar::Receiver::Linear::get_hand ( ) const

virtual

Get the hand of the basis.

Return true if the basis is right-handed.

Implements Pulsar::Receiver::State.

References y_offset.

get_orientation()

Angle Pulsar::Receiver::Linear::get_orientation ( ) const

virtual

Get the orientation of the basis about the line of sight.

Implements Pulsar::Receiver::State.

References x_offset, and y_offset.

get_reference_source_phase()

Angle Pulsar::Receiver::Linear::get_reference_source_phase ( ) const

virtual

Get the phase of the reference source.

Implements Pulsar::Receiver::State.

References calibrator_offset, and y_offset.

set_calibrator_offset()

void Pulsar::Receiver::Linear::set_calibrator_offset

(

const Angle &

offset

)

Set the offset of the feed calibrator axis from its nominal value.

In the linear basis, the noise diode must illuminate both receptors equally. Therefore, there are only two valid orientations:

Parameters

offset

either 0 or +/- 90 degrees

References calibrator_offset.

set_Y_offset()

void Pulsar::Receiver::Linear::set_Y_offset

(

const Angle &

offset

)

Set the offset of the feed Y axis from its nominal value.

In the right-handed basis, the Y axis points in the direction of East. However it is also common to encounter systems in which the Y axis is offset by 180 degrees, pointing West. This is equivalent to switching the sign of the Y probe, which amounts to a 180 degree rotation of the Stokes vector about the Q axis. It is also equivalent to the product of:

1. switching the X and Y probes (a 180 degree rotation about the U axis, as done when hand==Left)
2. a -90 degree rotation about the line of sight (a 180 degree rotation about the V axis, as done when the orientation_Y_offset = -90

which is how the transformation is represented by this class.

Parameters

offset

either 0 or +/- 180 degrees

References y_offset.

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

• Receiver_Linear.h
• Receiver_Linear.C