AIPS HELP file for CLSMO in 31DEC24
As of Fri Apr 19 23:01:22 2024
CLSMO: Task which smooths CL tables.
INPUTS
INNAME Input UV file name (name)
INCLASS Input UV file name (class)
INSEQ 0.0 9999.0 Input UV file name (seq. #)
INDISK 0.0 9.0 Input UV file disk unit #
SOURCES Source list ' '=>all.
DOBTWEEN -1.0 1.0 > 0 -> smooth all sources
together; else separate them
STOKES Stokes type to process
SELBAND Bandwidth to select (kHz)
SELFREQ Frequency to select (MHz)
FREQID Freq. ID to select, 0=>all
BIF 0.0 100.0 Lowest IF number 0=>all
EIF 0.0 100.0 Highest IF number 0=>all
TIMERANG Time range to use.
ANTENNAS Antennas to correct.
SUBARRAY 0.0 9999.0 Subarray; 0 => 1.
SAMPTYPE Interpolation function
BPARM Smoothing parameters
CUTOFF 0.0 Cutoff for functional forms
DOBLANK Blanked value interpolation
SMOTYPE Data to smooth
NORMALIZ -1.0 4.0 > 0 => apply a global
normaliztion - see HELP
GAINVER 0.0 Input CL table to use
BADDISK 0.0 9999.0 Disks to avoid for scratch
HELP SECTION
CLSMO
Task: This task smooths a CL table. Blanked values can be
interpolated. Note that this task does relatively simple
smoothing. VLBI data with rates and delays should be smoothed with
SNSMO rather than CLSMO and/or CLCAL.
WARNING: THIS TASK WAS CHANGED 27 MARCH, 2003. The smoothing no
longer propagates good solutions indefinitely. Instead the support
size is strictly enforced. Additional smoothing options are now
available. DOBLANK is now changed: if it is < 0, failed solutions
are not fixed, if it is >= 0 they are fixed. If it is <= 0, good
solutions are smoothed, if it is > 0 good solutions are not
altered.
Adverbs:
INNAME.....Input UV file name (name). Standard defaults.
INCLASS....Input UV file name (class). Standard defaults.
INSEQ......Input UV file name (seq. #). 0 => highest.
INDISK.....Disk drive # of input UV file. 0 => any.
SOURCES....list of sources to process.
'*' = all; a "-" before a source name
means all except ANY source named.
DOBTWEEN...> 0 => smooth all SN values regardless of source.
<= 0 => smooth only SN values from the same source.
Well-separated calibrators may have different phases just
because of different atmosphere, so one would not want to
smooth them together. This can be achieved via doing one
source at a time, but DOBTWEEN allows one to do all
sources at once - at least if the choice is a simple one.
STOKES.....The desired Stokes type of the output data:
'R ', 'L ', 'RL', ' '=> 'RL'.
FREQID.....Frequency identifier to select (you may determine
which is applicable from the OPTYPE='SCAN' listing
produced by LISTR).
BIF........First IF to process. 0=>all.
EIF........Highest IF to process. 0=>all higher than BIF
TIMERANG...Time range of the data to be used. In order:
Start day, hour, min. sec,
end day, hour, min. sec. Days relative to ref.
date.
ANTENNAS...A list of the antennas to be modified. If any
number is negative then all antennas listed are
NOT to be modified. All 0 => use all.
SUBARRAY...The subarray to modify. Do only one at a time.
SAMPTYPE...The type of smoothing.
'BOX ' = boxcar smoothing - the default
'MWF ' = Median window filter
'GAUS' = Gaussian
'EXP ' = Exponential
'LINE' = Linear (1 - abs(t-t0)/sigma)
'2PT ' = Two-point
'2PTH' = Two-point + "Hanning"
BPARM......Parameters for smoothing function.
Function support full-width width in hours.
(1) => support time for amplitudes,
(2) => support time for phase,
(3) => support time for rates
(4) => support time for singleband delay
Added parameter (FWHM) for GAUS, EXP, LINE
(6) => smoothing FWHM time for amplitudes,
(7) => smoothing FWHM time for phase,
(8) => smoothing FWHM time for rates
(9) => smoothing FWHM time for singleband delay
In all cases, the substitution for blanked and good
solutions is governed by DOBLANK (see below)
CUTOFF.....Cutoff for GAUS, EXP, LINE. The sum of the weighting
function in the support region must exceed CUTOFF for the
smoothed value to be regarded as valid. Be careful, a
value of 1.5 means that the sample itself must be good
and the sum over other good samples in the support range
must exceed 0.5. < 1.e-6 => 1.e-6.
DOBLANK....Blanked value interpolation:
> 0: replace previously blanked values with smoothed
values, leave previously good values unchanged.
= 0: replace previously blanked and previously good
values with smoothed values.
< 0: replace previously good values with smoothed values,
leave previously blanked values blanked.
SMOTYPE....Specified the data to be smoothed. ' '=>'AMPL'
'AMPL' = amplitude smoothing only,
'PHAS' = phase smoothing only,
'BOTH' = amplitude and phase,
'VLBI' = Delay and rate,
'FULL' = sine, cosine, delay and rate.
NORMALIZ...Controls whether a global gain normalization is applied
to the table. If there was one previously and NORMALIZ=0
or if NORMALIZ > 0, a global normalization is applied.
Otherwise, the global normalization parameter is left
unchanged.
GAINVER....Version number of the input Cal. table to smooth.
0 => Highest. A new CL table is always written.
BADDISK....A list of disks on which scratch files are not to
be placed. This will not affect the output file.
EXPLAIN SECTION
SAMPTYPE
'2PT ' - interpolates in time between the two nearest neighbors of
a flagged sample within the support time range
This mode is really only for DOBLANK > 0.
'2PTH' - interpolates in time between the two nearest neighbors of
a sample within the support time range, then averages the
sample (if good) with the interpolated value. When there
is only one good neighbor, the sample itself counts
double if it is good.