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gpedit

Section: User Commands (1)
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NAME

gpedit - Edit the gain table.  

PERSON RESPONSIBLE

mchw  

CATEGORIES

calibration  

DESCRIPTION

Gpedit is a MIRIAD task which modifies calibration tables. See also: GPLIST  

PARAMETERS

vis
The input visibility file, containing the gain file to modify. No default.
select
Normal uv data selection commands. See the help on "select" for more information. Currently only antenna, time, and amplitude selection is supported. The amplitude selection applies to the gains, not the uv-data, and can be used to flag or replace bad gain amplitudes. The default is to select everything.
feeds
The polarisation feeds affected (e.g. R, L, X or Y). Default is all feeds.
gain
This gives the complex-valued gain used in the `multiply' and `replace' options (see below). It is given as an amplitude and phase (in degrees). For example gain=2,90 produces a gain with a amplitude of 2 and phase of 90 degrees. The default is 1,0.
options
This gives extra processing options. Several values can be given, separated by commas. Option values can be abbreviated to uniqueness.

The following options operate on the gains:

  replace   The existing gains are replaced by the value
            given by the `gain' keyword. NOTE: If no other
            options are given, the replace option is performed.
  multiply  The existing gains are multiplied by the gain
            given by the `gain' keyword.
  flag      The existing gains are flagged as bad.
  amplitude The phases of the existing gains are set to 0.
  phase     The amplitudes of the existing gains are set to 1.
  scale     The phase of the gains is multiplied by the factor 
            given by the `gain' keyword. 
  dup       Convert a single-polarization gain table into a dual
            polarization table.

The following option operates on the polarization leakages:

  reflect   The existing leakages are made to possess a
            symmetry: For each antenna, we make
            DX = -conjg(DY).
  zmean     Subtract an offset, so that the mean leakage is 0.

Example:

  gpedit vis=cyga gain=14.4,90 select=ant(1,2) feeds=X


 

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