;DEFLG ;----------------------------------------------------------------------- ;! edits data based on decorrelation over channels and time ;# TASK UV CALIBRATION EDITING ;----------------------------------------------------------------------- ;; Copyright (C) 2001, 2003, 2006-2007, 2010 ;; 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 ;----------------------------------------------------------------------- DEFLG LLLLLLLLLLLLUUUUUUUUUUUU CCCCCCCCCCCCCCCCCCCCCCCCCCCCC DEFLG Flags data based on decorrelation over time, channels 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 # SOURCES Source list QUAL -10.0 Source qualifier -1=>all CALCODE Calibrator code ' '=>all TIMERANG Time range to purge SELBAND Bandwidth to select (kHz) SELFREQ Frequency to select (MHz) FREQID Freq. ID to select. BIF 0.0 100.0 Lowest IF number 0=>all EIF 0.0 100.0 Highest IF number 0=>all SUBARRAY 0.0 1000.0 Subarray, 0=>all 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 correct polarization. PDVER PD table to apply (DOPOL>0) BLVER BL table to apply. FLAGVER -1.0 Flag table version: in OUTFGVER 0.0 Output FG table version DOBAND -1.0 10.0 If >0 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. ANTENNAS Antennas to consider 0=>all BASELINE Baselines with ANTENNAS UVRANGE Range spacings in klambda ICHANSEL Select channels to fit: NOTE this is start,end,increment and IF for each region DOSTOKES -1.0 1.0 > 0 => flag all correlators if any one found bad DOALL -1.0 1.0 > 0 => flag all sources when one is flagged ICUT 0.0 1.0 Level vector/scalar average amplitude below which flagged SOLINT 0.0 Averaging time in sec DETIME 0.0 Time interval over which averaging is not done (sec) BADDISK 0.0 9999.0 Disks to avoid for scratch ---------------------------------------------------------------- DEFLG Task: This task applies the calibration (optionally) to UV data, sorts them to BT order and then examines the ratio of the vector-averaged amplitude to the scalar-averaged amplitude. It writes entries in the flag table when this ratio becomes too low. Be aware that a very large number of flag table lines may be written. Task UVCOP may be used to apply the flags and is the only task that can handle more than 5000 flags applying to a single time. 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. SOURCES....Source list. The task loops over all sources specified. '*' = all; a "-" before a source name means all except ANY source named. QUAL.......Only sources with a source qualifier number in the SU table matching QUAL will be used if QUAL is not -1. CALCODE....Sources may be selected on the basis of the calibrator code given in the SU table. ' ' => any calibrator code selected '* ' => any non blank code (cal. only) '-CAL' => blank codes only (no calibrators) anything else = calibrator code to select. NB: The CALCODE test is applied in addition to the other tests, i.e. SOURCES and QUAL, in the selection of sources to process. TIMERANG...Time range of the data to be copied. In order: Start day, hour, min. sec, day, hour, min. sec. Days relative to reference date. 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. BIF........First IF to check. 0=>all. EIF........Highest IF to check. 0=>all higher than BIF SUBARRAY...Subarray number to copy. 0=>all. 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 appply. <0 => apply no BL table, 0 => highest. FLAGVER....specifies the version of the flagging table to be applied to the data on input. 0 -> highest, -1 -> none. OUTFGVER...Flag table version to be used on output for both single- and multi-source data sets. If OUTFGVER is <= 0 or greater than FGmax (the previously highest FG version number), then a new FG table will be created for the new flags with version FGmax+1. This new table will also contain the flags applied on input (if any) from FG version FLAGVER. If OUTFGVER specifies a pre-existing FG version, then the input flags are not copied even if OUTFGVER and FLAGVER are not equal. 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. 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). ANTENNAS...A list of the antennas to be examined. All 0 => all. If any number is negative then all antennas listed are NOT to be copied and all others are. BASELINE...If any elements of BASELINE are non zero then all baselines between antennas named in ANTENNAS and those named in BASELINE are specified. If ANTENNAS contains a negative value then all baselines NOT specified are selected. UVRANGE....Range of baselines in kilolambda. ICHANSEL...Select up to 20 groups of channels/IF(s) to fit as sets of (Start,end,inc,IF), i.e., ICHANSEL = 6,37,1,0, 92,123,1,0 for two regions applyingto all IFs. The first group for which ICHANSEL(2,i) <= 0 ends the list. Defaults: Any IF having no group assigned to it, gets a group including all channels. ICHANSEL(1,j) defaults to 1, 0 < ICHANSEL(2,j) < ICHANSEL(1,j) defaults to Nchan. ICHANSEL(3,j) < 1 or > ICHANSEL(2,j)-ICHANSEL(1,j)+1 defaults to 1. ICHANSEL(4) <= 0 => this group applies to all IFs. DOSTOKES...> 0 => flag all correlators if any one is found bad, <= 0 => flag RR and LL separately (RL and LR get flagged when either RR or LL are flagged). DOALL......> 0 => flag all cources when one is flagged. Otherwise the flags are restricted to the source from which they are found. This may be useful when fast switching using a SOLINT rather longer than the actual scann length so that the weak source in between the strong cal is flagged based on the decorrelation of the cal. ICUT.......Flag all data < ICUT in vector average amplitude divided by scalar average amplitude. 0 -> 0.5 SOLINT.....Averaging time in seconds for comparing the vector and scalar amplitudes. 0 -> 60 DETIME.....A time interval between consecutive samples on a baseline > DETIME seconds is regarded as a break over which averaging will not be done. 0 -> 1000000 BADDISK....A list of disks on which scratch files are not to be placed. ----------------------------------------------------------------