DedisperseSamples

class baseband_tasks.dispersion.DedisperseSamples(ih, dm, *, reference_frequency=None, samples_per_frame=None, frequency=None, sideband=None)

Bases: DisperseSamples

Incoherently shift a time stream to correct for a dispersive time delay.

This task does not handle any in-channel dispersive smearing, but only shifts the samples according to the mid-channel frequency.

Parameters:

ihtask or baseband stream reader

Input data stream, with time as the first axis.

dmfloat or DispersionMeasure quantity

Dispersion measure to correct for. If negative, will disperse, but clearer to use DisperseSamples.

reference_frequencyQuantity

Frequency to which the data should be dispersed. Can be an array. By default, the mean frequency.

samples_per_frameint, optional

Number of dedispersed samples which should be produced in one go. The number of input samples used will be larger to avoid wrapping. If not given, the minimum length that gives at least 75% efficiency and ensures efficient fast fourier transforms.

frequencyQuantity, optional

Frequencies for each channel in ih. Default: taken from ih (if available).

sidebandarray, optional

Whether frequencies in ih are upper (+1) or lower (-1) sideband. Default: taken from ih (if available). Note that while this is only used if the data is real (to calculate the mid-channel frequency), it should always be passed in together with frequency, since otherwise other tasks cannot interpret frequency correctly.

See also

baseband_tasks.dispersion.DisperseSamples

for incoherent dispersion

baseband_tasks.dispersion.Dedisperse

for coherent dedispersion

Attributes Summary

dm

Attributes Documentation

dm