Polarisation Handling

The biggest difference between selfcal and gpscal is in the handling of polarisation and dual feeds.

Though selfcal can handle multiple pointings and frequency ranges, it assumes that the antenna gain is independent of feed (i.e. the X and Y gains are the same). It also only handles Stokes-I models (and ignores visibilities that are unrelated to determining Stokes-I).

Task gpscal is intended for telescopes with dual feeds (either linear or circular), such as the ATCA. Indeed, it will fail for other sorts of data.

Miriad manager