; INTPARM ;--------------------------------------------------------------- ;! specifies the parameters of the frequency interpolation function ;# ADVERB CALIBRATION ;----------------------------------------------------------------------- ;; Copyright (C) 1995, 2015 ;; 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 ;----------------------------------------------------------------------- ;--------------------------------------------------------------- INTPARM LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ---------------------------------------------------------------- INTPARM Type: Adverb (REAL(3)) Use: Used to specify the parameters of the interpolation function to be applied to spectral channels. SPECR and UVGRD have the most general usage as: INTPARM(1) = type of interpolation (weighted smoothing) to use 0 => Weighted substitution (INTPARM(2 and 3) ignored) in UVGRD, FFT in SPECR 1 => Hanning 2 => Gaussian 3 => Boxcar 4 => Sinc (i.e. sin(x)/x) 5 => Exponential 6 => Median window 7 => 2 point INTPARM(2) = the "diameter" of the function, i.e. width between first nulls of Hanning triangle and sinc function, FWHM of Gaussian, Exponential, width of Boxcar and median window. Defaults (if < 0.1) are 4, 2, 2, 3, 1.99, 4 channels for INTPARM(1) = 1 - 6. INTPARM(3) = the diameter over which the convolving function has value - in channels. Defaults: 1, 3, 1, 4, 3, 1 times INTPARM(2) used when input INTPARM(3) < INTPARM(2) (after application of defaults). Null value: 0, see above. Tasks: PCAL.....Determines instrumental polarization for UV data. INTPARM smooths the spectral solutions. RLDIF....Determines Right minus Left phase difference, corrects cal files. INTPARM smooths the spectral solutions. SPECR....Spectral regridding task for UV data. INTPARM smooths the input to the output (including FFT methods). UVGRD....Makes one data set have the spectral structure of another. INTPARM smoothe the input visibilities onto the frequencies of the output spectrum. ----------------------------------------------------------------