The MWA Correlator v2 (aka MWAX Correlator) is still under development. This article summarises the significant differences between the legacy (Ord/Current/v1) correlator and the new MWAX correlator
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As of writing the weights HDU is filled with 1's. In the near future, proper weight values will be supplied from the MWAX correlator. |
The weight data is represented by a single-precision floating point value per baseline and polarisation. Below is an example using 4 antenna 4 antenna (ant0, ant1, ant2, ant3) example and 4 polarisations (xx,xy,yx,yy) in one time step / integration (we only have time step per HDU). The ImgHDU data for the weights would look like the following:
| antA | antB | weight.xx | weight.xy | weight.yx | weight.yy |
|---|---|---|---|---|---|
| 0 | 0 | w | w | w | w | ant0,ant1
| 0 | 1 | w | w | w | w |
| 0 | ant0,ant22 | w | w | w | w |
| 0 | ant0,ant33 | w | w | w | w | ant1,ant1
| 1 | 1 | w | w | w | w |
| 1 | ant1,ant22 | w | w | w | w | ant1,ant3
| 1 | 3 | w | w | w | w |
| 2 | ant2,ant22 | w | w | w | w | ant2,ant3
| 2 | 3 | w | w | w | w |
| 3 | ant3,ant33 | w | w | w | w |