AIPS NRAO AIPS HELP file for DEFLG in 31DEC18



As of Mon Oct 15 11:08:13 2018


DEFLG: Flags data based on decorrelation over time, channels

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
QUAL            -10.0              Source qualifier -1=>all
CALCODE                            Calibrator code '    '=>all
TIMERANG                           Time range to purge
SELBAND                            Bandwidth to select (kHz)
SELFREQ                            Frequency to select (MHz)
FREQID                             Freq. ID to select.
BIF               0.0      100.0   Lowest IF number 0=>all
EIF               0.0      100.0   Highest IF number 0=>all
SUBARRAY          0.0     1000.0   Subarray, 0=>all
DOCALIB          -1.0      101.0   > 0 calibrate data & weights
                                   > 99 do NOT calibrate weights
GAINUSE                            CL (or SN) table to apply
DOPOL            -1.0       10.0   If >0 correct polarization.
PDVER                              PD table to apply (DOPOL>0)
BLVER                              BL table to apply.
FLAGVER          -1.0              Flag table version: in
OUTFGVER          0.0              Output FG table version
DOBAND           -1.0       10.0   If >0 apply bandpass cal.
                                   Method used depends on value
                                   of DOBAND (see HELP file).
BPVER                              Bandpass table version
SMOOTH                             Smoothing function. See
                                   HELP SMOOTH for details.
ANTENNAS                           Antennas to consider 0=>all
BASELINE                           Baselines with ANTENNAS
UVRANGE                            Range spacings in klambda
ICHANSEL                           Select channels to fit: NOTE
                                   this is start,end,increment
                                   and IF for each region
DOSTOKES         -1.0        1.0   > 0 => flag all correlators
                                   if any one found bad
DOALL            -1.0        1.0   > 0 => flag all sources when
                                   one is flagged
ICUT              0.0        1.0   Level vector/scalar average
                                   amplitude below which flagged
SOLINT            0.0              Averaging time in sec
DETIME            0.0              Time interval over which
                                   averaging is not done (sec)
BADDISK           0.0     9999.0   Disks to avoid for scratch

HELP SECTION

DEFLG
Task:  This task applies the calibration (optionally) to UV data,
       sorts them to BT order and then examines the ratio of the
       vector-averaged amplitude to the scalar-averaged amplitude.
       It writes entries in the flag table when this ratio becomes too
       low.

       Be aware that a very large number of flag table lines may be
       written.  Task UVCOP may be used to apply the flags and is the
       only task that can handle more than 5000 flags applying to a
       single time.
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....Source list.  The task loops over all sources specified.
             '*' = all; a "-" before a source name means all except ANY
             source named.
  QUAL.......Only sources with a source qualifier number in the SU table
             matching QUAL will be used if QUAL is not -1.
  CALCODE....Sources may be selected on the basis of the calibrator code
             given in the SU table.
                  '    ' => any calibrator code selected
                  '*   ' => any non blank code (cal. only)
                  '-CAL' => blank codes only (no calibrators)
                  anything else = calibrator code to select.
             NB: The CALCODE test is applied in addition to the other
             tests, i.e. SOURCES and QUAL, in the selection of sources
             to process.
  TIMERANG...Time range of the data to be copied. In order: Start day,
             hour, min. sec,  day, hour, min. sec. Days relative to
             reference date.
  SELBAND....Bandwidth of data to be selected. If more than one IF is
             present SELBAND is the width of the first IF required.
             Units = kHz. For data which contain multiple
             bandwidths/frequencies the task will insist that some form
             of selection be made by frequency or bandwidth.
  SELFREQ....Frequency of data to be selected. If more than one IF is
             present SELFREQ is the frequency of the first IF required.
             Units = MHz.
  FREQID.....Frequency identifier to select (you may determine which is
             applicable from the OPTYPE='SCAN' listing produced by
             LISTR). If either SELBAND or SELFREQ are set, their values
             override that of FREQID. However, setting SELBAND and
             SELFREQ may result in an ambiguity.  In that case, the task
             will request that you use FREQID.
  BIF........First IF to check. 0=>all.
  EIF........Highest IF to check. 0=>all higher than BIF
  SUBARRAY...Subarray number to copy. 0=>all.
  DOCALIB....If true (>0), calibrate the data using information in the
             specified Cal (CL) table for multi-source or SN table for
             single-source data.  Also calibrate the weights unless
             DOCALIB > 99 (use this for old non-physical weights).
  GAINUSE....version number of the CL table to apply to multi-source
             files or the SN table for single-source files.
             0 => highest.
  DOPOL......If > 0 then correct data for instrumental polarization as
             represented in the AN or PD table.  This correction is
             only useful if PCAL has been run or feed polarization
             parameters have been otherwise obtained.  See HELP DOPOL
             for available correction modes: 1 is normal, 2 and 3 are
             for VLBI.  1-3 use a PD table if available; 6, 7, 8 are
             the same but use the AN (continuum solution) even if a PD
             table is present.
  PDVER......PD table to apply if PCAL was run with SPECTRAL true and
             0 < DOPOL < 6.  <= 0 => highest.
  BLVER......Version number of the baseline based calibration
             (BL) table to appply. <0 => apply no BL table,
             0 => highest.
  FLAGVER....specifies the version of the flagging table to be applied
             to the data on input.         0 -> highest, -1 -> none.
  OUTFGVER...Flag table version to be used on output for both single-
             and multi-source data sets.  If OUTFGVER is <= 0 or
             greater than FGmax (the previously highest FG version
             number), then a new FG table will be created for the new
             flags with version FGmax+1.  This new table will also
             contain the flags applied on input (if any) from FG
             version FLAGVER.  If OUTFGVER specifies a pre-existing FG
             version, then the input flags are not copied even if
             OUTFGVER and FLAGVER are not equal.
  DOBAND.....If true (>0) then correct the data for the shape of the
             antenna bandpasses using the BP table specified by BPVER.
             The correction has five modes:
             (a) if DOBAND=1 all entries for an antenna in the table
             are averaged together before correcting the data.
             (b) if DOBAND=2 the entry nearest in time (including
             solution weights) is used to correct the data.
             (c) if DOBAND=3 the table entries are interpolated in
             time (using solution weights) and the data are then
             corrected.
             (d) if DOBAND=4 the entry nearest in time (ignoring
             solution weights) is used to correct the data.
             (e) if DOBAND=5 the table entries are interpolated in
             time (ignoring solution weights) and the data are then
             corrected.
  BPVER......Specifies the version of the BP table to be applied
             0 => highest numbered table.
             <0 => no bandpass correction to be applied.
  SMOOTH.....Specifies the type of spectral smoothing to be applied to
             a uv database . The default is not to apply any smoothing.
             The elements of SMOOTH are as follows:
             SMOOTH(1) = type of smoothing to apply: 0 => no smoothing
               To smooth before applying bandpass calibration
                 1 => Hanning, 2 => Gaussian, 3 => Boxcar, 4 => Sinc
               To smooth after applying bandpass calibration
                 5 => Hanning, 6 => Gaussian, 7 => Boxcar, 8 => Sinc
             SMOOTH(2) = the "diameter" of the function, i.e. width
               between first nulls of Hanning triangle and sinc
               function, FWHM of Gaussian, width of Boxcar. Defaults
               (if < 0.1) are 4, 2, 2 and 3 channels for SMOOTH(1) =
               1 - 4 and 5 - 8, resp.
             SMOOTH(3) = the diameter over which the convolving
               function has value - in channels.  Defaults: 1,3,1,4
               times SMOOTH(2) used when input SMOOTH(3) < net
               SMOOTH(2).
  ANTENNAS...A list of the antennas to be examined.  All 0 => all.
             If any number is negative then all antennas listed are NOT
             to be copied and all others are.
  BASELINE...If any elements of BASELINE are non zero then all baselines
             between antennas named in ANTENNAS and those named in
             BASELINE are specified.  If ANTENNAS contains a negative
             value then all baselines NOT specified are selected.
  UVRANGE....Range of baselines in kilolambda.
  ICHANSEL...Select up to 20 groups of channels/IF(s) to fit as sets
             of (Start,end,inc,IF), i.e., ICHANSEL = 6,37,1,0,
             92,123,1,0 for two regions applyingto all IFs.  The first
             group for which ICHANSEL(2,i) <= 0 ends the list.
             Defaults: Any IF having no group assigned to it, gets a
             group including all channels.
             ICHANSEL(1,j) defaults to 1,
             0 < ICHANSEL(2,j) < ICHANSEL(1,j) defaults to Nchan.
             ICHANSEL(3,j) < 1 or > ICHANSEL(2,j)-ICHANSEL(1,j)+1
             defaults to 1.
             ICHANSEL(4) <= 0 => this group applies to all IFs.
  DOSTOKES...> 0 => flag all correlators if any one is found bad,
             <= 0 => flag RR and LL separately (RL and LR get flagged
             when either RR or LL are flagged).
  DOALL......> 0 => flag all cources when one is flagged.  Otherwise
             the flags are restricted to the source from which they
             are found.  This may be useful when fast switching using
             a SOLINT rather longer than the actual scann length so
             that the weak source in between the strong cal is flagged
             based on the decorrelation of the cal.
  ICUT.......Flag all data < ICUT in vector average amplitude divided
             by scalar average amplitude.  0 -> 0.5
  SOLINT.....Averaging time in seconds for comparing the vector and
             scalar amplitudes.  0 -> 60
  DETIME.....A time interval between consecutive samples on a baseline
             > DETIME seconds is regarded as a break over which
             averaging will not be done.  0 -> 1000000
  BADDISK....A list of disks on which scratch files are not to be
             placed.

EXPLAIN SECTION


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