nenupytf

Python3 package to read and analyze NenuFAR Time-Frequency data from UnDySPuTeD.

Installation

nenupytf can be installed via pip, the recommended tool for installing Python packages:

pip install nenupytf

Keep you up-to-date with the latest release and get the newest functionalities by regularly updating the package:

pip install nenupytf --upgrade

Quickstart

Observation informations

Prior to diving within the large data volume, one can quickly get a summary of the observation content with the command:

nenupytf-info --obs /path/to/observation_directory/

The output would look something like:

--------------- nenupytf ---------------
Info on /path/to/observation_directory/OBS_XXX_XXX_0.spectra
Lane: 0
Time: 2019-10-13T07:20:55.0000000 -- 2019-10-13T07:25:54.4404020
Frequency: 39.0625 -- 76.5625 MHz
Beams: [0]
----------------------------------------

displaying for each lane, the time and frequency range as well as the beam indices.

On can also display these informations on individual files by printing the instance of a Lane object:

from nenupytf.read import Lane
l = Lane('OBS_XXX_XXX_0.spectra')
print(l)

Selecting data

To select data from a specific file:

from nenupytf.read import Lane
l = Lane('OBS_XXX_XXX_0.spectra')
time_select = ['2019-10-13 07:25:50.4404020', '2019-10-13 07:25:54.4404020']
freq_select = [50, 54.97]
spec = l.select(time=time_select, freq=freq_select, beam=0, stokes='I')

The select() methods, returns a SpecData object, storing the time (in astropy.time.Time format), the frequency in MHz, and the Dynamic Spectrum (which is a 2D array). Besides, a SpecData object enables several cleaning or analysis methods specific to dynamic spectra.

Averaging on time and frequency may allow to see a full picture of the data. However it may take some time to process!

from nenupytf.read import Lane
l = Lane('OBS_XXX_XXX_0.spectra')
spec = l.average()

Of course, one can specify every parameter such as in the select() method. Besides, average() accepts df and dt, respectively the time bin (in seconds) and the frequency bin (in MHz):

from nenupytf.read import Lane
l = Lane('OBS_XXX_XXX_0.spectra')
time_select = ['2019-10-13 07:25:50.4404020', '2019-10-13 08:00:00.000']
freq_select = [30, 60]
t, f, d = l.average(df=2, dt=3, time=time_select, freq=freq_select, beam=0, stokes='I')

Command-line plot

To display a plot of the selection, simply run: