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Polarisation
Polarisation displays provide useful diagnostic tools. The noise diode
injects a linearly polarised signal at 45° to the probes. Each
probe therefore receives equal noise power. You can look at the
polarisation display consisting of the cross-power spectrum between
the two polarisation IF chains from a single antenna. This display
will tell you if both IF chains are operating normally for that
antenna. The plot should be similar to this one
except that the baseline (BL) will be set for an autocorrelation (e.g.,
11 or 44) and the polarisation (PO) will be AB for frequency 1 and
CD for frequency 2.
Robin Wark
2006-10-24