; WEIGHTIT ;--------------------------------------------------------------- ;! Controls modification of weights before gain/fringe solutions ;# ADVERB CALIBRATION UV VLBI ;----------------------------------------------------------------------- ;; 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 ;----------------------------------------------------------------------- ;--------------------------------------------------------------- WEIGHTIT LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- WEIGHTIT Type: Adverb (scalar) Use: A code controlling the modification of data weights prior to their use in gain solutions and fringe fitting. Weighting by uncertainty squared may be too extreme a method, down-weighting outer antennas excessively and producing failed solutions. Weighting linearly by uncertainty may be more stable. Values: 0 - no change weighting by 1/sigma**2 1 - sqrt (wt) weighting by 1/sigma may be more stable 2 - (wt)**0.25 weighting by 1/sqrt(sigma) 3 - wt -> 1.0 no weighting Null value: 0 Tasks: CALIB.....determines antenna calibration: complex gain FRING.....fringe fit data to determine antenna calibration, delay, rate KRING.....fringe fit data to determine antenna calibration, delay, rate ----------------------------------------------------------------