; DOFIT ;--------------------------------------------------------------- ;! Controls which antennas are fit by what methods ;# ADVERB calibration ;----------------------------------------------------------------------- ;; Copyright (C) 2004 ;; Associated Universities, Inc. Washington DC, USA. ;; ;; This program is free software; you can redistribute it and/or ;; modify it under the terms of the GNU General Public License as ;; published by the Free Software Foundation; either version 2 of ;; the License, or (at your option) any later version. ;; ;; This program is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; ;; You should have received a copy of the GNU General Public ;; License along with this program; if not, write to the Free ;; Software Foundation, Inc., 675 Massachusetts Ave, Cambridge, ;; MA 02139, USA. ;; ;; Correspondence concerning AIPS should be addressed as follows: ;; Internet email: aipsmail@nrao.edu. ;; Postal address: AIPS Project Office ;; National Radio Astronomy Observatory ;; 520 Edgemont Road ;; Charlottesville, VA 22903-2475 USA ;----------------------------------------------------------------------- DOFIT LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- DOFIT Type: Adverb (Array(30)) Use: List of antennas to be fitted by a process or of control codes for fitting by antenna number. The use of DOFIT in CALIB, FRING, and KRING requires considerable understanding of the process involved. In the case in which there are a number of antennas which are "good" and a number of antennas which are "poor/bad", one may avoid having the bad antennas affect the gain solutions for the good antennas and then use all the data to get some estimate of the gains of the bad antennas. This is a multi-step process: 1. Run CALIB/FRING/KRING selecting only the good antennas with ANTENNAS (DOFIT=0 is simplest). 2. Run CLCAL to apply the resulting SN table to the existing CL to make a new CL - use 'CALP' to insure that the bad antennas still appear in the new CL table. 3. Then, set ANTENNAS=0 (all) and DOFIT=list of bad antennas. Also set REFANT to the raference antenna used in step 1. 4. Repeat the CLCAL to make a full CL table with all antennas. When DOFIT is specified, the gains (and delays and rates) of those antennas which are not being fit are held to (1,0,0,0). If the actual gains of these antennas are not this fully calibrated result, then the results on the fitted antennas will be vary wrong. Note that when DOFIT is used, SOLTYPE is ignored by CALIB. Tasks: APCAL.....Apply TY and GC tables to generate an SN table DOFIT controls type of fitting done for opacity. CALIB.....Determines antenna calibration: complex gain DOFIT lists antennas for which solutions are desired. FRING.....Fringe fit data to determine antenna calibration, delay, rate. DOFIT lists antennas for which solutions are desired. KRING.....Fringe fit data to determine antenna calibration, delay, rate. DOFIT lists antennas for which solutions are desired. Procedures: VLBACALA..Applies a-priori amplitude corrections to VLBA data DOFIT controls type of fitting done for opacity. ----------------------------------------------------------------