AIPS HELP file for UVPRM in 31DEC24
As of Tue Apr 16 3:04:24 2024
UVPRM: Measure UV data parmeters from a u,v data base:
INPUTS
INNAME Input UV file name (name)
INCLASS Input UV file name (class)
INSEQ 0.0 9999.0 Input UV file name (seq. #)
INDISK Input UV file disk unit #
SOURCES Sources to measure, ' '=>all.
QUAL -10.0 Qualifier -1=>all
CALCODE Calibrator code ' '=>all
STOKES Stokes type to select.
SELBAND Bandwidth to select (kHz)
SELFREQ Frequency to select (MHz)
FREQID Freq. ID to select.
TIMERANG Time range to select
ANTENNAS Antennas to measure
BASELINE Baselines with ANTENNAS
UVRANGE UV range in kilolambda.
SUBARRAY 0.0 1000.0 Subarray, 0 => all
CHANNEL 0.0 4096.0 Spectral channel #
BIF IF number to measure
DOCALIB -1.0 101.0 > 0 calibrate data & weights
> 99 do NOT calibrate weights
GAINUSE CAL (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 Flag 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.
BPARM Control parameters
8 : Number of bins
9 : .ne.0=>list bin values.
FLUX Minimum Y axis Value
BADDISK Disk to avoid for scratch.
HELP SECTION
UVPRM
Type: Task
Use: Automatic measurement of u,v data parameters for use as
input to automatic self-calibration and mapping procedures.
The Min, Max UVRANGE are returned as header keywords UVPRAMIN,
and UVPRAMAX. The zero-spacing flux and rms are returned via
keywords UVPFLUX0 and UVPRMSF0. The observing time on source
(days) is returned in UVPOTIME and a reasonable choice for a
reference antenna is returned in UVPREFAN. See GETHEAD and
IMHEADER for methods of accessing header keywords.
Sub sets of the input UVdata can be selected in the
standard manner. The data selection part of the UVPRM task
is based on AIPS task UVPLT.
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 be measured. ' '=> all; if any
starts with a '-' then all except ANY source named.
QUAL.......Qualifier of source to be measured. -1 => all.
CALCODE....Calibrator code of sources to measure. ' '=> all.
STOKES.....The desired Stokes type of the measure data:
'I','Q','U','V','RR','LL' anything else=>'I'
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 overide that of FREQID.
However, setting SELBAND and SELFREQ may result in
an ambiguity. In that case, the task will request
that you use FREQID. If all SELBAND, SELFREQ and
FREQID are not specified (.le. 0) then all FQ ids
will be selected.
TIMERANG...Time range of the data to be measured. In order:
Start day, hour, min. sec,
end day, hour, min. sec. Days relative to ref.
date.
ANTENNAS...A list of the antennas to measure. If any number
is negative then all antennas listed are NOT
desired and all others are.
All 0 => list all.
BASELINE...Baselines are specified using BASELINE.
Eg. baselines 1-6,1-8, 2-6 and 2-8
use ANTENNAS=1,2; BASELINE=6,8.
UVRANGE....Range of projected spacings to be measure in 1000's
of wavelengths. 0 => 1, 1.E10
SUBARRAY...Subarray number to measure. 0 => all.
CHANNEL....Spectral line channel number. 0 => 1.
BIF........IF number to measure. 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 Cal. table to apply to the
data if DOCALIB=1. Refers to a CL table for
multisource data or an SN table for single source.
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....(multisource) specifies the version of the
flagging table to be applied. 0 => highest
numbered table. <0 => no flagging to be applied.
DOBAND.....(multisource) 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......(multisource) specifies the version of the BP table
to be applied. 0 => highest numbered table.
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).
BPARM......Control parameters, 8 : Number of bins for zero-
spacing and rms measurements.
9 : .ne.0=>list bin values.
BADDISK....Disk numbers to avoid for scratch files. Scratch
files may be created by the sorting routines if
calibration or flagging is applied.
EXPLAIN SECTION