AIPS HELP file for RLDIF in 31DEC09
As of Sun Nov 22 16:31:53 2009
RLDIF: Task to return Right - Left phase difference
INPUTS
INNAME UV data (name).
INCLASS UV data (class).
INSEQ 0.0 9999.0 UV data (seq. #). 0 => high
INDISK Disk unit #. 0 => any
SOURCES Source list
CALCODE Calibrator code ' '=>all
TIMERANG Time range to list
SELBAND Bandwidth to select (kHz)
SELFREQ Frequency to select (MHz)
FREQID Freq. ID to select.
None selected => 1.
BIF 0.0 100.0 Lowest IF number 0=1
EIF 0.0 100.0 Highest IF number
BCHAN 0.0 2048.0 Low channel number 0=>1
ECHAN 0.0 2048.0 High channel number
ANTENNAS Antennas to list
UVRANGE 0.0 UV range in kilolambda
SUBARRAY 0.0 1000.0 Subarray, 0=>1
Cal. info for input:
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.
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.
DOCRT -3.0 132.0 > 0 -> use the terminal,
else use the line printer
> 72 => terminal width
= 0 -> no printing
OUTPRINT
Printer disk file to save
BADDISK Disk to avoid for scratch.
CLCORPRM @ R-L phase difference returned
HELP SECTION
RLDIF
Type: Task
Use: Prints matrix listings of visibility phase data with RL in the
upper right and conjugate of LR in the lower left. This may be
used to determine the right minus left phase correction to be
applied in CLCOR or RLCOR for calibrating phase. The mean
phases so determined are returned in the adverb CLCORPRM - but
must be corrected before they are used in CLCOR or RLCOR:
FOR I=1:20; CLCORP(I) = EXPECT-CLCORP(I); END
where EXPECT is the expected R-L phase (twice the source
polarization angle). The printing may be suppressed.
Adverbs:
INNAME.....UV file name (name). Standard defaults.
INCLASS....UV file name (class). Standard defaults.
INSEQ......UV file name (seq. #). 0 => highest.
INDISK.....Disk unit #. 0 => any.
SOURCES....List of sources to be listed. ' '=> all; if any
starts with a '-' then all except ANY source named.
CALCODE....Calibrators 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 selection tests
TIMERANG...Time range of the data to be listed. In order:
Start day, hour, min. sec,
end day, hour, min. sec. Days relative to ref.
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, 0=> all
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, 0=> all
FREQID.....Frequency identifier to select. 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 neither SELBAND, SELFREQ nor FREQID are
specified then the first FQ id in the FQ table (usually
1) will be used.
BIF........IF to list - first returned. 0 -> 1
EIF........Last IF listed and returned. 0 -> BIF+19 or max
whichever is smaller.
BCHAN......First channel to average. 0=> 1
ECHAN......Last channel to average. 0=> Highest
ANTENNAS...A list of the antennas to list. If any number is
negative then the antennas specified are not listed
and all others are. All 0 => list all.
UVRANGE....Range of projected spacings to be listed in 1000's of
wavelengths. 0 => 1, 1.E10
SUBARRAY...Subarray number to list. 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 of an SN table for single source.
0 => highest. Used for OPTYPE='MATX','LIST'.
DOPOL......If > 0 then correct data for instrumental polarization as
represented in the AN table. Only one subarray may be
done at a time. 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.
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. 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.
<0 => no bandpass correction done.
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).
DOCRT......False (< 0) use the line printer if OUTPRINT = ' '
else write named OUTPRINT file only.
When OUTPRINT is not blank, DOCRT=-2 suppresses the
page-feed character on page headers and DOCRT=-3
suppresses page headers and most other header
information.
= 0 special usage -> no printing just return answer.
True (> 0) use the terminal interactively. The task will
use the actual terminal width as a display limit
unless 72 < DOCRT < width. In that case, the display
limit will be DOCRT characters.
OUTPRINT...Disk file name in which to save the line printer output.
' ' => use scratch and print immediately for interactive
jobs - batch jobs use OUTPRINT = 'PRTFIL:BATCHjjj.nnn'
(jjj= job #, nnn = user #). When OUTPRINT is not blank,
multiple outputs are concatenated, and the file is not
actually printed.
BADDISK....Disk numbers to avoid for scratch files. Scratch
files may be created by the sorting routines if
calibration or flagging is applied.
CLCORPRM...OUTPUT adverb: right-left phase difference in degrees for
IFs BIF through BIF+19. The self-consistent mean
phases so determined are returned in the adverb CLCORPRM
- but must be corrected before they are used in CLCOR or
RLCOR:
FOR I=1:20; CLCORP(I) = EXPECT-CLCORP(I); END
where EXPECT is the expected R-L phase (twice the source
polarization angle).
EXPLAIN SECTION