; REFREQ ;--------------------------------------------------------------- ;! Allows changing of reference pixel ;# PROCEDURE UV CALIBRATION ;----------------------------------------------------------------------- ;; Copyright (C) 1995, 1997-1998; 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 ;--------------------------------------------------------------- REFREQ LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC REFREQ Procedure to change reference frequency or pixel INNAME Input UV file name (name) INCLASS Input UV file name (class) INSEQ 0.0 9999.0 Input UV file name (seq. #) INDISK 0.0 9.0 Input UV file disk unit # INVER FQ table to modify SUBARRAY 0.0 1000.0 Subarray, 0 => 1. PIXVAL Desired reference pixel OFFSET Desired reference pixel shift (ignored if PIXVAL<>0) PRTLEV Control amount of output when file is run. To run type RUN REFREQ ---------------------------------------------------------------- REFREQ Task: REFREQ allows you to move the reference pixels to other parts of the band. Please contact daip@nrao.edu with questions, comments, or suggestions. REFREQ is a run file, to use it set the inputs then type RUN REFREQ. Adverbs: INNAME.....Input UV file name (name). Standard defaults. INCLASS....Input UV file name (class). Standard defaults. INSEQ......Input UV file name (seq. #). 0 => highest. INDISK.....Disk drive # of input UV file. 0 => any. SUBARRAY...Subarray number to use. NO DEFAULT PIXVAL.....Desired reference pixel, overrides OFFSET. OFFSET.....Desired reference pixel shift, ignored if PIXVAL is set. PRTLEV.....>=0 print progress messages >=1 print pre and post-process FQ table < 0 nothing printed ---------------------------------------------------------------- REFREQ: Geodesy experiments may benefit if the reference pixel is nearer the center of the frequenies sampled in the observation - this task lets you change the reference pixel DOCUMENTOR: A. Mioduszewski PROGRAMMER: K. Desai, NRAO/SOC PURPOSE ------- REFREQ allows you to consistently change the reference pixel so that FRING solutions are referenced to near the center of the solution interval [in time and frequency]. REFREQ does not modify the actual frequency information contained in the tables produced by the correlator as a record of how the correlation was performed.