Dedisperse

class baseband_tasks.dispersion.Dedisperse(ih, dm, *, reference_frequency=None, samples_per_frame=None, frequency=None, sideband=None)[source] [edit on github]

Bases: Disperse

Coherently dedisperse a time stream.

Parameters:
ihtask or baseband stream reader

Input data stream, with time as the first axis.

dmfloat or DispersionMeasure quantity

Dispersion measure. If negative, will disperse correctly, but clearer to use the Disperse class.

reference_frequencyQuantity

Frequency to which the data should be dedispersed. Can be an array. By default, the mean frequency. If one doesn’t want to change the start time, choose the maximum 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 (channelized frequencies will be calculated). 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).

See also

baseband_tasks.fourier.fft_maker

to select the FFT package used.

baseband_tasks.dispersion.Disperse

for coherent dispersion

baseband_tasks.dispersion.DedisperseSamples

for incoherent dedispersion

Attributes Summary

dm

Attributes Documentation

dm