call_everybeam

Tests for the functions in WODEN/src/call_everybeam.c. Obviously, these tests are only pertinent if you have compiled against the EveryBeam library, and I’ve setup CMake to only compile these tests if you have.

To create values to test against, I’ve written a number of Python notebooks that call the native EveryBeam python wrapper. These notebooks dump out values to .h header files, to directly include in the tests. If you ever need to regenerate these values, you’ll need to install the EveryBeam Python wrapper, which means installing with cmake .. -DBUILD_WITH_PYTHON=ON.

test_check_ms_telescope_type.c

check_ms_telescope_type reads the telescope type from a Measurement Set. Test by reading in three different MS, and checking the correct telescope type is returned. The MS are from the MWA, LOFAR, and OSKAR.

test_load_everybeam_telescope.c

load_everybeam_telescope reads in the EveryBeam telescope object from a measurement set. Check we can read in an MWA, LOFAR, and OSKAR MS with no error.

test_run_*_beam.c

All tests test_run_*_beam.c work the same, barring test_run_mwa_beam.c, which is explained below. These tests run the relevant EveryBeam primary beam model for a given telescope (LBA and HBA of LOFAR and an SKA model of OSKAR). A 31 by 31 grid of ra,dec directions are given to the LOFAR tests, and a 21 by 21 grid to the OSKAR set (OSKAR beam model is much slower). All tests run the beam at two frequencies, two time steps, for two stations. The tests are run;

  • one with parallactic rotation and without normalisation

  • one with parallactic rotation and normalisation

  • one reordering into the IAU polarisation convention

All values are testing against stored values in the header files.

test_run_mwa_beam.c

Similar to other test_run_*_beam.c tests, however the MWA model takes in az,za as directions. Only one station is run as I have no way of controlling dipole amplitudes so all MWA stations are identical. The MWA model also seems to always come out normalised, so only test the parallactic rotation and reordering into the IAU polarisation convention.