beam_solver is a python package for estimating the primary beam of the Hydrogen Epoch of Reinozation Array by tracking astronomical sources.

The main goals of this package is 1) to generate images for any given bandwith using the CASA softaware 2) to generate a catalog of sources from the images 3) to construct the antenna or instrument beam pattern using measurements

First install dependencies.

• numpy >= 1.10
• scipy
• matplotlib
• astropy >= 2.0
• aipy
• h5py
• pyuvdata (pip install pyuvdata or use https://github.com/RadioAstronomySoftwareGroup/pyuvdata.git)
• linsolve (https://github.com/HERA-Team/linsolve.git)
• hera_cal (https://github.com/HERA-Team/hera_cal.git)
• PyBDSF (https://github.com/lofar-astron/PyBDSF.git)

Clone the repo using git clone https://github.com/Chuneeta/beam_solver.git cd beam_solver python setup.py install

Modules driving the beam_solver package:

A module to generate images from a miriad file using CASA. It includes modules that convert the miriad file to measurement set and CASA images to fits images

A module that runs PyBDSF on images and returns back a text file with the extracted sources. It can choose unique source within a given radius.

A module that generates a catalog of sources using the sources extracted by PyBDSF. The output catalog contains the flux values (peak) of a source from n snaphosts, the corresponding error associated with the extracted fluxes, hour angle values, ra-dec coordinates and az-alt coordinates.

A module to construct the primary beam using the measurements stored in the catalog. It forms a linear system of equations which is fed to linsolve to solve for the beam values.

Requires installation of nose package. beam_solver directory run: nosetests beam_solver.

Bug reports or feature requests are also very welcome, please add them to the issue log after verifying that the issue does not already exist. Contact ridhima.nunhokee@curtin.edu.au for any queries or comments.