As of Sat Jun 22 16:50:37 2024

ACIMG: Images autocorrelation data showing time vs frequency


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 #
OUTNAME                            Output MA file name (name)
OUTCLASS                           Output MA file name (class)
OUTSEQ            0.0     9999.0   Output MA file name (seq. #)
OUTDISK           0.0        9.0   Output MA file disk unit #
ANTENNAS                           Antennas to include
TIMERANG                           Time range to select:
                                     Start Day, Hour, Min, Sec
                                     End Day, Hour, Min, Sec
STOKES                             I, Q, U, V, RR, LL, VV, HH
                                   also allowed RL, LR, VH, HV
BPARM                              Control parameters
                                   2 : averaging interval (sec)
                                   3 > 0 -> write error image
SOURCES                            Source name
QUAL            -10.0              Calibrator qualifier -1=>all
CALCODE                            Calibrator code '    '=>all
SELBAND                            Bandwidth to select (kHz)
SELFREQ                            Frequency to select (MHz)
FREQID            0.0              Frequency ID number: 0 -> 1
SUBARRAY          0.0     1000.0   Sub-array, 0=>all
BIF               0.0              First IF to include
EIF               0.0              Last IF to include
BCHAN             0.0              First channel to include
ECHAN             0.0              Last channel to include
NCHAV             0.0              Number channels to average
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 >0.5 correct polarization.
PDVER                              PD table to apply (DOPOL>0)
BLVER                              BL table to apply.
FLAGVER                            Flag table version
DOBAND           -1.0       10.0   If >0.5 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.
BADDISK                            Disks to avoid for scratch


Type: Task
Use:  Makes an image of autocorrelation data found in a UV data base.
      as a function of time and frequency.  Task DFTIM makes this
      sort of image for cross-correlation data, while TBAVG makes a UV
      data set of the summed visibilities and DFTPL makes a plot of a
      selected frequency range.
  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.
  OUTNAME....Output name of image(name).    Standard defaults.
  OUTCLASS...Output name of image(class).   Standard defaults.
  OUTSEQ.....Output name of image(seq. #).  0 => highest unique
  OUTDISK....Disk drive # of Output image.  0 => highest with space
  ANTENNAS...List of antennas to include.  0 -> any.  Note that the
             task makes an ANTENNA axis making an image cube.
  TIMERANG...Time range of the data to be plotted. In order:
             Start day, hour, min, sec, End day, hour, min, sec.
             Days relative to reference date.  0 => full range.
  STOKES.....Only one polarization is allowed: I, Q, U, V, RR, LL, VV,
             HH.  Cross-hands (RL, LR, VH, HV) are allowed but only
             the real part is imaged.
  BPARM......Control parameters:
     1:  unused
     2 = averaging interval in seconds (0 => 60)
         NOTE: an interval beginning at a sample time T1 will include
         all samples < T1+BPARM(2).  If your data occur at 5 second
         intervals and you want no averaging, set BPARM(2) < 5.  If
         you want to average pairs of samples, set 5 < BPARM(2) < 10.
     3 = > 0 -> write also an error image
     4-10 unused
  SOURCES....Source to be copied.   '  '=> all; if any starts with a
             '-' then all except ANY source named.
             NOTE: this task makes sense only if you select a single
  QUAL.......Qualifier of source to be processed. -1 => all.
  CALCODE....Calibrator code of source to be processed. ' '=> all.
  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.
  SUBARRAY...Sub-array number to process. 0=>all (okay if not
  BIF........Start IF; 0 -> 1
  EIF........End IF; 0 -> max
  BCHAN......Start channel; 0 -> 1
  ECHAN......End channel; 0 -> max
  NCHAV......Number of channels to average.  Note that ECHAN is
             adjusted if necessary to make (ECHAN-BCHAN+1) and integer
             multiple of NCHAV.  0 -> 1.
  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 apply. <0 => apply no BL table, 0 => highest.
  FLAGVER....specifies the version of the flagging table to be applied.
              0 => highest numbered table.
             <0 => no flagging to be applied.
  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
             (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
             IMAGR uses DOBAND as the nearest integer; 0.1 is therefore
  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
  BADDISK....The disk numbers to avoid for scratch files (sorting
             tables mostly).