AIPS HELP file for BASFIT in 31DEC21
As of Sun May 16 12:34:04 2021
BASFIT: Procedure to calibrate and fit antenna locations
INNAME UV data (name).
INCLASS UV data (class).
INSEQ 0.0 9999.0 UV data (seq. #). 0 => high
INDISK Disk unit #. 0 => any
ANTENNAS Antennas to fit
SUBARRAY 0.0 1000.0 Subarray, 0=>1
REFANT 0.0 90.0 Reference antenna
Output text file base name
DOCOLOR Do color plots (if > 0)
Use: Runs 3 tasks:
1. CALIB on scan averages of all calibrator sources
2. LOCIT to fit the phases of the SN table for antenna
locations; prints and plots the results.
3. LWPLA to put the plots on paper
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.
ANTENNAS...A list of the antennas to fit. If any number is negative
then all antennas listed are NOT desired and all others
are. All 0 => fit all except REFANT.
SUBARRAY...Subarray number to list. 0=>1.
REFANT.....Antenna that is asumed to be fixed --- all fits are
relative to this antenna. Note that you may use no
reference antenna if you wish - effectively saying that
the reference antenna phases are all zero which they will
be if the same REFANT was used in CALIB. The difference
method has no use for a REFANT.
OUTPRINT...The output text file name without extension. The
extensions .FIT, .SUM, .OPR, and .VLA are written. The
first contains everything, the others just summaries.
OUTPRINT = ' ' => do not write the text files.
DOCOLOR....The procedure has two plot modes. If DOCOLOR <= 0, one
antenna is plotted per page with all IFs and
polarizations in separate plots. If DOCOLOR > 0, three
antennas are plotted on a page, all IFs and polarizations
are plotted together for each antenna but in different
symbols and colors.
1. CALIB is run with ANTENNAS=0, CALCODE='*', APARM=3,0; SOLINT=0
to solve for all antennas, using scan averages of all calibrator
sources, allowing fits with 3 or more antennas.
2. LOCIT is run in
a) IF phase is assumed constant and is fit.
b) No K term is found
c) Elevations < 30 degrees are ignored
d) Hour angles < -6 and > +6 hours are ignored.
e) One or three antennas are plotted per page depending on
f) The plots have a minimum scale of -20 to 20 degrees, but will
go to larger values if needed.
See LOCIT help for more information.
Plot colors (DOCOLOR true) meaning
IF 1 Pol R = yellow RGB = (1 1 0)
1 L = green (0.06 1 0)
2 R = pink (1 0.67 1)
2 L = cyan (0 1 1)
Background nearly black (0.07, 0.08, 0.03)