Initial release

This is the first version release. Tools and methods in healvis are capable of generating and reading unpolarized HEALPix-based sky models and simulating radio interferometer measurements.

Features:

• Compatibility with a variety of output file formats via pyuvdata.
• Parallelization over the time axis via python's mutliprocessing module.
• Vectorized and numba-accelerated computations.
• Splitting the frequency axis and computing serially, when memory limitation is a concern.
• Support for uniform, Airy disk, and chromatic Gaussian primary beams.
• Support for pyuvdata.UVBeam primary beam models.
• Utilities for generating compatible maps of the Global Sky Model using pygsm.
• Tools for delay spectrum analysis.
• Precise position calculations using astropy coordinate tools.
• Verification of visibility calculations, power spectrum amplitude, and source motion in unit tests.

Limitations and known issues:

• Parallelization can cause memory bloat when simulating wide fields of view and bandpasses.
• Very memory and time intensive. Recommended for HPC clusters.
• No support yet for incomplete sky models or point source catalogs.
• Simulates only stokes-I sky models.
• Single beam type per array only.