; SY2TY ;--------------------------------------------------------------- ;! Task to generate a TY extension file from an EVLA SY table ;# TASK EXT-APPL CALIBRATION ;----------------------------------------------------------------------- ;; Copyright (C) 2011 ;; 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 ;----------------------------------------------------------------------- SY2TY LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC SY2TY: Task to convert EVLA SY table data to a TY table INNAME Image name(name). INCLASS Image name(class). INSEQ 0.0 9999.0 Image name(seq. #). 0=>high INDISK Disk drive #. 0=>any INVERS 0.0 46655.0 Model Fit version number OUTVERS 0.0 46655.0 STar file version number. ---------------------------------------------------------------- SY2TY Type: Task Use: SY2TY reads EVLA SY and CD tables and writes a TY table containing Tsys. Note that the SY table must be used to calibrate EVLA data, Tsys alone will not suffice. The raw "visibilities" from the EVLA Binary Data Format are not normalized correlation coefficients so they are not amplitude calibrated by scaling by Tsys. In fact the scaling is sqrt (Tsys/Psum) of antenna 1 times sqrt (Tsys/Psum) of antenna 2. Psum and Pdif can have jumps in them which scale out perfectly in Tsys but affect the raw "visibilities" as well. This makes TYAPL needed to calibrate visibility by visibility rather than an interpolated calibration (SN table) such as is done in APCAL. Adverbs: INNAME......Image name (name). Standard defaults. INCLASS.....Image name (class). Standard defaults. INSEQ.......Image name (seq. #). 0 => highest. INDISK......Disk unit #. 0 => any. INVERS......Version number of SY table to be translated to TY. OUTVERS.....Version number of TY table created. 0 => highest+1. ---------------------------------------------------------------- ----------------------------------------------------------------