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CLIC\SOLVE RF_PASSBAND [da] [dp] [/PLOT]
*** THIS HELP HAS NOT BEEN UPDATED FOR THE NGRX ***
Solve for passband calibration curves, by fitting it to the amplitudes
and phases. The current index should contain calibration observations of
strong continuum sources (RF passband calibrator). The behaviour of this
command depends on the current mode of RF passband calibration (Frequen-
cy or Channel).
- For frequency-dependent RF passabnd calibration (SET RF_PASSBAND
FREQUENCY, recommended): the resolution is normally done using all
the spectral subbands plotted together, as a function of intermedi-
ate frequency. It should be done separately for upper and lower side
bands. A single frequency-dependent polynomial is fitted, a high de-
gree might be necessary for the phase, if band edges are used (up to
20 is feasible).
- For channel dependent RF passband calibration (SET RF_PASSBAND CHAN-
(i) For continuum, the data itself is directly stored as calibration
values (this gives a channel-dependent passband curve). In addition
a polynomial is fitted and optionally plotted (this gives a frequen-
cy-dependent passband curve).
(ii) For spectral subbands, polynomials are fitted and optionally
plotted, as a channel-dependent passband curve.
The degrees for polynomials are 'da' for amplitude, 'dp' for phase (de-
faults 0 and 1). Command STORE should be used next to store the fitted
function in the header of source observations. Both channel dependent
and frequency dependent curves can be stored; Use command SET RF_PASS-
BAND FREQUENCY|CHANNEL to apply one or the other.
Option /PLOT will plot the polynomial fits over the data.