Content-type: text/html Manpage of atxy

atxy

Section: User Commands (1)
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NAME

atxy - Apply on-line XY phase measurements to Miriad data.  

PERSON RESPONSIBLE

rjs  

CATEGORIES

uv analysis  

DESCRIPTION

ATXY corrects data for XY phase errors. It determines the XY phase measurements, either from the xyphase visibility variable or from the text file written by AIPS ATLOD, averages them, and then applies them to the data. The averaging step consists of finding the median XY phase in a given interval.  

PARAMETERS

vis
The names of the input uv data sets. No default.
xyphase
If the data were loaded with Miriad ATLOD, then they should contain the on-line XY phase measurements in the xyphase variable. Howver if the data were loaded with AIPS (and then transferred to Miriad via FITS files), then you must give the name of the XY phase text file written by AIPS. Generally it will be XYPHS_xx, where xx is an AIPS user number.
refant
Antennas to apply XY phase corrections to. Generally it is best to apply corrections to only a single antenna -- the antenna which you have the greatest confidence in the XY phase measurements. Often this antenna will be the reference antenna during the observation. If you apply the XY phase to a subset of antennas, one of these antennas should be used as the ``refant'' antenna to GPCAL. No default.
interval
This gives the length of an averaging interval, in minutes. The default is 30 minutes, but larger values may be useful.
break
The times, in the normal Miriad format, where there are break points. A ``break point'' gives a time where some form of instrumental glitch took place, and the xyphases jumped. By giving a break point, you prevent a solution interval from spanning this time.
sideband
Sideband indicators. If the input was loaded with AIPS ATLOD, and if you averaged it into a channel-0 data-set, you must give the sideband indicator (+1 or -1) for each IF. This information is needed to convert between the AIPS and Miriad XY phase convention. If the input is still multi-channel data, or you used Miriad ATLOD, it is wiser to let this parameter default. Note that ATXY cannot cope with channel-0 data-sets when the sideband indicators change with time.
out
The name of the output uv data set. No default.
options
Extra processing options. Several options can be given, separated by commas. Minimum match is supported. Possible values are:
  srcbreak  Generate break points every time there is a change
            in source.
  undo      Apply the negative of the XY phase correction. There
            should be no sensible reason to ever use this option.
  reweight  Reweight the data (in the lag domain) to minimise the
            so-called Gibbs phenomena and to help localise
            interference.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

This document was created by man2html, using the manual pages.
Time: 18:35:38 GMT, July 05, 2011