Model primary beam of antennas using isolated sources

[danasimard]

Focus on modelling primary beam at boresight. Doesn't take into account direction dependent effects, including any pointing offsets.

[danasimard]

• Parameterize primary beam (width, right ascension offset, amplitude) and look at changes over time, etc. for calibrator observations
• Take a 2-day set of observations without moving antennas to measure the primary beam in a non-parameterized way
• Look at whether primary beam changes after moving antennas away and back to same dec

[danasimard]

Primary beam is well-described by Gaussian over the HPBW, and a Gaussian model should be sufficient in most cases (e.g. real-time calibration). Primary beam width is fit whenever we measure SEFDs or azimuthal pointing offsets, and therefore will be monitored over time per antenna and polarization through those regular measurements. We may need to refine this model when considering calibration using multiple sources in a field.

Before this is closed:

• Include primary beam fit from commissioning SEFD & azimuthal pointing measurements in real-time calibration source model.