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SOLVE PHASE

CLIC\SOLVE PHASE [/PLOT] [/BREAK kind time [kind time ...]]
[/POLYNOMIAL degree] [/WEIGHT]
*** THIS HELP HAS NOT BEEN UPDATED FOR THE NGRX ***
This will fit a mathematical function into the measured phases of the
sources in the current index (presumably calibrators). This data must
have been selected and plotted in axes : SET X TIME and SET Y PHASE for
the baselines and bands of interest, specified by the corresponding SET
commands. Phases should be continuous (SET PHASE CONTINUOUS). The cali-
bration function is kept in memory. Command STORE should be used next to
store this function in the header of source observations, after a change
in the index to select the appropriate scans.
SOLVE PHASE internally and temporarily resets SET PHASE to ABSOLUTE.
The INTERNAL|EXTERNAL mode is kept to allow determining a phase curve on
top of an external receiver reference.
In antenna mode (selected by SET AMPLITUDE ANTENNA), the averaged phase
and amplitude closures are computed, as well as their standard devia-
tions. The phase closures should be close to zero, while the amplitude
closures should be close to 100%.
Option /PLOT will plot the fitted curve over the data.
Fitted curves may be of two kinds:
- Cubic splines (the default). By default knots are regularly spaced
with an interval between knots set by the SET STEP command. Addi-
tional knots may be introduced with the option "/BREAK kind time
[kind time ...]" which introduces a break at abscissa 'time';
'kind' is an integer in the range 0-3; 0 means that a discontinuity
will be present, 1 that the first derivative will be discontinuous,
and so on. Several breaks may be introduced. The program will de-
tect an error if too many breaks are introduced, compared to the
density of data points.
- Polynomial curves may be used instead. For this the option is:
/POLYNOMIAL [degree] indicating the degree of the polynomial (de-
fault 0).
Normally the data points are all assigned the same weight for the fit.
With option /WEIGHT, the data points are weighted according to their er-
rors.

Gildas manager
2014-07-01