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qvack

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NAME

qvack - Flag after change to observing setup  

PERSON RESPONSIBLE

rjs  

CATEGORIES

calibration  

DESCRIPTION

Qvack is a Miriad task to flag data for a number of integrations near an observing setup change. For example, this is used to flag data that is suspect because the instrument had not settled correctly after the change in the setup. The visibility data are should to be in time order.  

PARAMETERS

vis
Input visibility data file. No default.
select
Standard uv data selection. Default is to select all data.
interval
This gives the time interval, in minutes, for which the data are flagged after a setup change (or before a setup change, if its value is negative). The default is 0.1, which flags for the first 6 seconds after a switch.
force
The time interval, in minutes, which indicates the amount of time that should ellapse before forcing a (virtual) setup change. Thus you can QVACK on data that has distinct scans but no actual change in observing setup. Note that this means the first INTERVAL amount of data is always flagged. The MODE option is not needed, nor is it used if you set FORCE Defaults to no forced setup change.
options
Extra processing options. Currently only one exists:
  anticipate   Normally the interval given by the "interval" keyword
               is relative to the time of the first data found with
               a new setup. options=anticipate makes it relative
               to the time of the last data before a setup change
               occurs.
mode
This determines what changes in setup cause flagging. Several values can be given, separated by commas, and minimum match is used. Possible values are:
  frequency    A change in the frequency setup. Do not use this
               option if Doppler tracking is used.
  source       A change in the source observed.
  mosaic       A change in the observing centre of a mosaiced
               observation.


 

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