; ACIMG ;--------------------------------------------------------------- ;! Makes image of autocorrelation data showing time vs frequency ;# Task Analysis UV ;----------------------------------------------------------------------- ;; Copyright (C) 2020 ;; 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 ;----------------------------------------------------------------------- ACIMG LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC ACIMG Images autocorrelation data showing time vs frequency 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 # OUTNAME Output MA file name (name) OUTCLASS Output MA file name (class) OUTSEQ 0.0 9999.0 Output MA file name (seq. #) OUTDISK 0.0 9.0 Output MA file disk unit # ANTENNAS Antennas to include TIMERANG Time range to select: Start Day, Hour, Min, Sec End Day, Hour, Min, Sec STOKES I, Q, U, V, RR, LL, XX, YY also allowed RL, LR, XY, YX BPARM Control parameters 2 : averaging interval (sec) 3 > 0 -> write error image SOURCES Source name QUAL -10.0 Calibrator qualifier -1=>all CALCODE Calibrator code ' '=>all SELBAND Bandwidth to select (kHz) SELFREQ Frequency to select (MHz) FREQID 0.0 Frequency ID number: 0 -> 1 SUBARRAY 0.0 1000.0 Sub-array, 0=>all BIF 0.0 First IF to include EIF 0.0 Last IF to include BCHAN 0.0 First channel to include ECHAN 0.0 Last channel to include NCHAV 0.0 Number channels to average DOCALIB -1.0 101.0 > 0 calibrate data & weights > 99 do NOT calibrate weights GAINUSE CL (or SN) table to apply DOPOL -1.0 10.0 If >0.5 correct polarization. PDVER PD table to apply (DOPOL>0) BLVER BL table to apply. FLAGVER Flag table version DOBAND -1.0 10.0 If >0.5 apply bandpass cal. Method used depends on value of DOBAND (see HELP file). BPVER Bandpass table version SMOOTH Smoothing function. See HELP SMOOTH for details. BADDISK Disks to avoid for scratch ---------------------------------------------------------------- ACIMG Type: Task Use: Makes an image of autocorrelation data found in a UV data base. as a function of time and frequency. Task DFTIM makes this sort of image for cross-correlation data, while TBAVG makes a UV data set of the summed visibilities and DFTPL makes a plot of a selected frequency range. 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. OUTNAME....Output name of image(name). Standard defaults. OUTCLASS...Output name of image(class). Standard defaults. OUTSEQ.....Output name of image(seq. #). 0 => highest unique OUTDISK....Disk drive # of Output image. 0 => highest with space ANTENNAS...List of antennas to include. 0 -> any. Note that, if more than one occurs at a given time, the data will be averaged. TIMERANG...Time range of the data to be plotted. In order: Start day, hour, min, sec, End day, hour, min, sec. Days relative to reference date. 0 => full range. STOKES.....Only one polarization is allowed: I, Q, U, V, RR, LL, XX, YY. Cross-hands (RL, LR, XY, YX) are allowed but only the real part is imaged. BPARM......Control parameters: 1: unused 2 = averaging interval in seconds (0 => 60) NOTE: an interval beginning at a sample time T1 will include all samples < T1+BPARM(2). If your data occur at 5 second intervals and you want no averaging, set BPARM(2) < 5. If you want to average pairs of samples, set 5 < BPARM(2) < 10. 3 = > 0 -> write also an error image 4-10 unused SOURCES....Source to be copied. ' '=> all; if any starts with a '-' then all except ANY source named. NOTE: this task makes sense only if you select a single source. QUAL.......Qualifier of source to be processed. -1 => all. CALCODE....Calibrator code of source to be processed. ' '=> all. SELBAND....Bandwidth of data to be selected. If more than one IF is present SELBAND is the width of the first IF required. Units = kHz. For data which contain multiple bandwidths/frequencies the task will insist that some form of selection be made by frequency or bandwidth. SELFREQ....Frequency of data to be selected. If more than one IF is present SELFREQ is the frequency of the first IF required. Units = MHz. FREQID.....Frequency identifier to select (you may determine which is applicable from the OPTYPE='SCAN' listing produced by LISTR). If either SELBAND or SELFREQ are set, their values override that of FREQID. However, setting SELBAND and SELFREQ may result in an ambiguity. In that case, the task will request that you use FREQID. SUBARRAY...Sub-array number to process. 0=>all (okay if not calibration) BIF........Start IF; 0 -> 1 EIF........End IF; 0 -> max BCHAN......Start channel; 0 -> 1 ECHAN......End channel; 0 -> max NCHAV......Number of channels to average. Note that ECHAN is adjusted if necessary to make (ECHAN-BCHAN+1) and integer multiple of NCHAV. 0 -> 1. DOCALIB....If true (>0), calibrate the data using information in the specified Cal (CL) table for multi-source or SN table for single-source data. Also calibrate the weights unless DOCALIB > 99 (use this for old non-physical weights). GAINUSE....version number of the CL table to apply to multi-source files or the SN table for single source files. 0 => highest. DOPOL......If > 0 then correct data for instrumental polarization as represented in the AN or PD table. This correction is only useful if PCAL has been run or feed polarization parameters have been otherwise obtained. See HELP DOPOL for available correction modes: 1 is normal, 2 and 3 are for VLBI. 1-3 use a PD table if available; 6, 7, 8 are the same but use the AN (continuum solution) even if a PD table is present. PDVER......PD table to apply if PCAL was run with SPECTRAL true and 0 < DOPOL < 6. <= 0 => highest. BLVER......Version number of the baseline based calibration (BL) table to apply. <0 => apply no BL table, 0 => highest. FLAGVER....specifies the version of the flagging table to be applied. 0 => highest numbered table. <0 => no flagging to be applied. DOBAND.....If true (>0) then correct the data for the shape of the antenna bandpasses using the BP table specified by BPVER. The correction has five modes: (a) if DOBAND=1 all entries for an antenna in the table are averaged together before correcting the data. (b) if DOBAND=2 the entry nearest in time (including solution weights) is used to correct the data. (c) if DOBAND=3 the table entries are interpolated in time (using solution weights) and the data are then corrected. (d) if DOBAND=4 the entry nearest in time (ignoring solution weights) is used to correct the data. (e) if DOBAND=5 the table entries are interpolated in time (ignoring solution weights) and the data are then corrected. IMAGR uses DOBAND as the nearest integer; 0.1 is therefore "false". BPVER......Specifies the version of the BP table to be applied 0 => highest numbered table. <0 => no bandpass correction to be applied. SMOOTH.....Specifies the type of spectral smoothing to be applied to a uv database . The default is not to apply any smoothing. The elements of SMOOTH are as follows: SMOOTH(1) = type of smoothing to apply: 0 => no smoothing To smooth before applying bandpass calibration 1 => Hanning, 2 => Gaussian, 3 => Boxcar, 4 => Sinc To smooth after applying bandpass calibration 5 => Hanning, 6 => Gaussian, 7 => Boxcar, 8 => Sinc SMOOTH(2) = the "diameter" of the function, i.e. width between first nulls of Hanning triangle and sinc function, FWHM of Gaussian, width of Boxcar. Defaults (if < 0.1) are 4, 2, 2 and 3 channels for SMOOTH(1) = 1 - 4 and 5 - 8, resp. SMOOTH(3) = the diameter over which the convolving function has value - in channels. Defaults: 1,3,1,4 times SMOOTH(2) used when input SMOOTH(3) < net SMOOTH(2). BADDISK....The disk numbers to avoid for scratch files (sorting tables mostly). ----------------------------------------------------------------