AIPS HELP file for VHCAL in 31DEC24
As of Mon May 6 19:53:44 2024
VHCAL: Divide I, Q, U, models into linear polarization data
INPUTS
INNAME Input UV data name (name)
INCLASS Input UV data name (class)
INSEQ 0.0 9999.0 Input UV data name (seq. #)
INDISK 0.0 9.0 Input UV data disk unit #
IN2NAME Input I model UV (name)
IN2CLASS Input I model UV (class)
IN2SEQ 0.0 9999.0 Input I model UV (seq. #)
IN2DISK 0.0 9.0 Input I model disk unit #
IN3NAME Input Q model UV (name)
IN3CLASS Input Q model UV (class)
IN3SEQ 0.0 9999.0 Input Q model UV (seq. #)
IN3DISK 0.0 9.0 Input Q model disk unit #
IN4NAME Input U model UV (name)
IN4CLASS Input U model UV (class)
IN4SEQ 0.0 9999.0 Input U model UV (seq. #)
IN4DISK 0.0 9.0 Input U model disk unit #
CALSOUR (1) Calibration source name
DOCALIB -1.0 101.0 > 0 calibrate data & weights
> 99 do NOT calibrate weights
GAINUSE CL (or SN) 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
OUTNAME Output UV data name (name)
OUTCLASS Output UV data name (class)
OUTSEQ Output UV data name (seq)
OUTDISK Output UV data disk unit #
BADDISK Disk to avoid for scratch
HELP SECTION
VHCAL
Task: This task takea an input UV data set in linear polarization and
divides by a model taken from matching I, Q, and U model data
sets. Typically, the procedure VHCALIB produces these from the
input data set and model images using SPLIT and UVSUB.
The output UV file is a divided file suitable for input to CALIB
with APARM(2)=1. The model is
VV = I + Q cos(p1+p2) + U sin (p1+p2)
HH = I - Q cos(p1+p2) - U sin (p1+p2)
where p1 and p2 are the two antennas' parallactic angles
(functions of time) and I, Q, U are the Stokes visibility
functions of location in the u,v plane. The input data after
DOCALIB, DOBAND, and FLAGVER must exactly align with the I, Q,
U model data sets.
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.
IN2NAME....Input I UV model name (name). Standard defaults.
IN2CLASS...Input I UV model name (class). Standard defaults.
IN2SEQ.....Input I UV model name (seq. #). 0 => highest.
IN2DISK....Disk drive # of input I UV model. 0 => any.
IN3NAME....Input Q UV model name (name). Standard defaults.
IN3CLASS...Input Q UV model name (class). Standard defaults.
IN3SEQ.....Input Q UV model name (seq. #). 0 => highest.
IN3DISK....Disk drive # of input Q UV model. 0 => any.
IN4NAME....Input U UV model name (name). Standard defaults.
IN4CLASS...Input U UV model name (class). Standard defaults.
IN4SEQ.....Input U UV model name (seq. #). 0 => highest.
IN4DISK....Disk drive # of input U UV model. 0 => any.
CALSOUR....(1) Calibration source name. (2)-(30) ignored.
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.
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
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 if
DOBAND > 0. 0 => highest numbered table.
<0 => no bandpass correction to be applied.
OUTNAME....Output UV file name (name). Standard defaults.
OUTCLASS...Output UV file name (class). Standard defaults.
OUTSEQ.....Output UV file name (seq. #). 0 => highest unique
OUTDISK....Disk drive # of output UV file. 0 => highest w room
BADDISK....The disk numbers to avoid for scratch files (sorting
EXPLAIN SECTION