Phase-coherent dispersion removal frequency response function. More...

#include <Dedispersion.h>

Inherits dsp::PlasmaResponse.

Public Member Functions
	Dedispersion ()
	Default constructor.

	~Dedispersion ()
	Default constructor.

void	prepare (const Observation *input, unsigned channels)
	Set up and calculate the impulse_pos and impulse_neg attributes.

virtual void	mark (Observation *output)
	Set the dispersion measure attribute in the output Observation.

void	set_dispersion_measure (double dm)
	Set the dispersion measure in ${\rm pc\,cm}^{-3}$ .

double	get_dispersion_measure () const
	Get the dispersion measure in ${\rm pc\,cm}^{-3}$ .

double	delay_time (double freq) const override
	Return the dispersive delay for the given frequency.

void	set_sample_delay (SampleDelay *)
	Correct fractional inter-channel delay given the integer sample inter-channel delay.

SampleDelay *	get_sample_delay ()
	Get the integer sample inter-channel delay.

virtual void	build (const Observation *input=0)
	Build the frequency response kernel.

void	build (std::vector< float > &phases, unsigned npts, unsigned nchan)
	Compute the phases for a dedispersion kernel.

void	set_build_delays (bool delay=true)
	Build delays in microseconds instead of phases.

Static Public Attributes
static const double	dm_dispersion = 2.41e-4
	Conversion factor between dispersion measure, DM, and dispersion, D. More...

Protected Member Functions
void	build (unsigned ndat, unsigned nchan)

void	build_setup (double chan_freq)
	Set up for the specified channel.

double	build_compute (double chan_freq, double freq)
	Return the phase of the kernel response.

Protected Attributes
double	dispersion_measure = 0.0
	The dispersion measure (DM)

Reference::To< SampleDelay >	sample_delay
	Used to compute inter-channel fractional sample delay.

bool	build_delays = false
	Build method returns delay in microseconds instead of phase.

double	interchannel_fractional_sample_delay = 0.0

Friends
class	PlasmaResponse

Detailed Description

Phase-coherent dispersion removal frequency response function.

Member Data Documentation

◆ dm_dispersion

const double dsp::Dedispersion::dm_dispersion = 2.41e-4

static

Conversion factor between dispersion measure, DM, and dispersion, D.

Although the value:

$DM\,({\rm pc\,cm^{-3}})=2.410331(2)\times10^{-4}D\,({\rm s\,MHz^{2}})$

has been derived from "fundamental and primary physical and astronomical constants" (section 3 of Backer, Hama, van Hook and Foster 1993. ApJ 404, 636-642), the rounded value is in standard use by pulsar astronomers (page 129 of Manchester and Taylor 1977).

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

Dedispersion.h
Dedispersion.C

Public Member Functions

Static Public Attributes

Protected Member Functions

Protected Attributes

Friends

Detailed Description

Member Data Documentation

◆ dm_dispersion