AIPS NRAO AIPS HELP file for SUBARRAY in 31DEC21



As of Tue Jan 26 12:17:13 2021



HELP SECTION

SUBARRAY
Type:  Adverb  (scalar)
Use:   Standard data selection adverb, used to specify the subarray
       desired.  When data sets are combined (e.g. with DBCON) they may
       be assigned different subarray numbers to tell them apart.  For
       example, when combining two configurations of the VLA.  In that
       case, antenna N will be at different stations in the two.
       Another use also arises.  AIPS does not allow two sources to be
       observed simultaneously.  However, VLBI astrometry often uses
       some antennas for one source and some for another at one time
       and then different combinations of antennas on other sources at
       other times.  This can be handled by multiple identical
       "subarrays" which can be written by task USUBA.
Null value:
       0   => all subarrays in some tasks, -> 1 in others.  Only 1
              subarray may be calibrated at a time unless the task
              is able to loop over subarray number.  Check the help
              files to be sure.
Verbs:
   EVLA..........Puts the list of eVLA antennas in the current file on
                 stack.
   HSA...........Puts the list of HSA antennas in the current file on
                 stack.
   OBITIMAG......Access to OBIT task Imager without self-cal or peeling.
   OBITPEEL......Access to OBIT task Imager with self-cal and peeling.
   OBITSCAL......Access to OBIT task Imager with self-cal, NOT peeling.
   VLBA..........Puts the list of VLBA antennas in the current file on
                 stack.
Procedures:
   ANTNUM........Returns number of a named antenna.
   BASFIT........Fits antenna locations from SN-table data.
   CRSFRING......Procedure to calibrate cross pol. delay and phase
                 offsets.
   FXAVG.........Procedure to enable VLBA delay de-correlation
                 corrections.
   LINIMAGE......Build image cube from multi-IF data set.
   VLACLCAL......Runs CLCAL and prints the results with LISTR.
   VLBAAMP.......Applies a-priori amplitude corrections to VLBA data.
   VLBAARCH......Procedure to archive VLBA correlator data.
   VLBACALA......Applies a-priori amplitude corrections to VLBA data.
   VLBACPOL......Procedure to calibrate cross-polarization delays.
   VLBACRPL......Plots crosscorrelations.
   VLBAFIX.......Procedure that fixes VLBA data, if necessary.
   VLBAFRGP......Fringe fit phase referenced data and apply calibration.
   VLBAFRNG......Fringe fit data and apply calibration.
   VLBAKRGP......Fringe fit phase referenced data and apply calibration.
   VLBAKRNG......Fringe fit data and apply calibration.
   VLBAMPCL......Calculates and applies manual instrumental phase
                 calibration.
   VLBAPANG......Corrects for parallactic angle.
   VLBAPCOR......Calculates and applies instrumental phase calibration.
   VLBASNPL......Plots selected contents of SN or CL files.
   VLBASUBS......Looks for subarrays in VLBA data.
Tasks:
   ACFIT.........Determine antenna gains from autocorrelations.
   ACLIP.........Edits suto-corr data for amplitudes, phases, and weights
                 out of range.
   ACSCL.........Corrects cross amplitudes using auto correlation
                 measurements.
   ALVAR.........Plots the Allan Variance statistic of a UV data set.
   ALVPR.........Prints statistics on the Allan Variance of a UV data set.
   ANBPL.........Plots and prints uv data converted to antenna based
                 values.
   ANCAL.........Places antenna-based Tsys and gain corrections in CL
                 table.
   ANTAB.........Read amplitude calibration information into AIPS.
   APCAL.........Apply TY and GC tables to generate an SN table.
   APGPS.........Apply GPS-derived ionospheric corrections.
   ATMCA.........Determines delay/phase gradient from calibrator
                 observations.
   AVSPC.........Averages uv-data in the frequency domain.
   BLAPP.........Applies baseline-based fringe solutions a la BLAPP.
   BLAVG.........Average cross-polarized UV data over baselines.
   BLCAL.........Compute closure offset corrections.
   BLCHN.........Compute closure offset corrections on a
                 channel-by-channel basis.
   BLING.........Find residual rate and delay on individual baselines.
   BLPLT.........Plots BLCAL tables in 2 dimensions as function of
                 baseline and IF.
   BPASS.........Computes spectral bandpass correction table.
   BPCOR.........Correct BP table.
   BPEDT.........Interactive TV task to edit uv data based on BP tables.
   BPEPL.........Plots bandpass tables overlaying multiple times like
                 BPEDT.
   BPLOT.........Plots bandpass tables in 2 dimensions as function of
                 time.
   BPWAY.........Determines channel-dependent relative weights.
   BPWGT.........Calibrates data and scales weights by bandpass
                 correction.
   BSCAN.........Seeks best scan to use for phase cal, fringe search, ..
   CALIB.........Determines antenna calibration: complex gain.
   CAPLT.........Plots closure amplitude and model from CC file.
   CL2HF.........Convert CL table to HF table.
   CLCAL.........Merges and smooths SN tables, applies them to CL tables.
   CLCOR.........Applies user-selected corrections to the calibration CL
                 table.
   CLIP..........Edits data based on amplitudes, phases, and weights out
                 of range.
   CLPLT.........Plots closure phase and model from CC file.
   CLSMO.........Smooths a calibration CL table.
   CLVLB.........Corrects CL table gains for pointing offsets in VLBI
                 data.
   COHER.........Baseline Phase coherence measurement.
   CORER.........Calculates correlator statistics and flags bad ones.
   CPASS.........Computes polynomial spectral bandpass correction table.
   CSCOR.........Applies specified corrections to CS tables.
   CVEL..........Shifts spectral-line UV data to a given velocity.
   DECOR.........Measures the decorrelation between channels and IF of uv
                 data.
   DEFLG.........Edits data based on decorrelation over channels and time.
   DELZN.........Determines residual atmosphere depth at zenith and clock
                 errors.
   DFCOR.........Applies user-selected corrections to the calibration CL
                 table.
   DFTIM.........Makes image of DFT at arbitrary point showing time vs
                 frequency.
   DFTPL.........Plots DFT of a UV data set at arbitrary point versus
                 time.
   DIFRL.........Divides the RR data by LL data.
   DTSUM.........Task to provide a summary of the contents of a dataset.
   EDITA.........Interactive TV task to edit uv data based on TY/SY/SN/CL
                 tables.
   EDITR.........Interactive baseline-oriented visibility editor using the
                 TV.
   ELFIT.........Plots/fits selected contents of SN, TY, SY, PC or CL
                 files.
   ELINT.........Determines and removes gain dependence on elevation.
   EVASN.........Evaluates statistics in SN/CL tables.
   EVAUV.........Subtracts & divides a model into UV data, does statistics
                 on results.
   FARAD.........Add ionospheric Faraday rotation to CL table.
   FGCNT.........Counts samples comparing two flag tables.
   FGPLT.........Plots selected contents of FG table.
   FGPRT.........Pprints counts of selected portions of an FG table.
   FGSPW.........Flags bad spectral windows.
   FINDR.........Find normal values for a uv data set.
   FLAGR.........Edit data based on internal RMS, amplitudes, weights.
   FLGIT.........Flags data based on the rms of the spectrum.
   FLOPM.........Reverses the spectral order of UV data, can fix VLA
                 error.
   FRING.........Fringe fit data to determine antenna calibration, delay,
                 rate.
   FRMAP.........Task to build a map using fringe rate spectra.
   FRPLT.........Task to plot fringe rate spectra.
   FTFLG.........Interactive flagging of UV data in channel-time using the
                 TV.
   FUDGE.........Modifies UV data with user's algorithm: paraform task.
   GETJY.........Determines calibrator flux densities.
   IBLED.........Interactive BaseLine based visibility EDitor.
   IMAGR.........Wide-field and/or wide-frequency Cleaning / imaging task.
   INDXR.........Writes index file describing contents of UV data base.
   KRING.........Fringe fit data to determine antenna calibration, delay,
                 rate.
   LISTR.........Prints contents of UV data sets and assoc. calibration
                 tables.
   LOCIT.........Fits antenna locations from SN-table data.
   LPCAL.........Determines instrumental polarization for UV data.
   MBDLY.........Fits multiband delays from IF phases, updates SN table.
   NOIFS.........Makes all IFs into single spectrum.
   OBEDT.........Task to flag data of orbiting antennas.
   OBTAB.........Recalculate orbit parameters and other spacecraft info.
   OMFIT.........Fits sources and, optionally, a self-cal model to uv
                 data.
   PCAL..........Determines instrumental polarization for UV data.
   PCASS.........Finds amplitude bandpass shape from pulse-cal table data.
   PCCOR.........Corrects phases using  PCAL tones data from PC table.
   PCEDT.........Interactive TV task to edit pulse-cal (PC) tables.
   PCFIT.........Finds delays and phases using a pulse-cal (PC) table.
   PCFLG.........Interactive flagging of Pulse-cal data in channel-TB
                 using the TV.
   PCLOD.........Reads ascii file containing pulse-cal info to PC table.
   PCPLT.........Plots pulse-cal tables in 2 dimensions as function of
                 time.
   PCVEL.........Shifts spectral-line UV data to a given velocity: planet
                 version.
   PDEDT.........Interactive TV task to edit polarization D-term (PD)
                 tables.
   PDPLT.........Plots selected contents of PD tables.
   PHSRF.........Perform phase-referencing within a spectral line
                 database.
   POSSM.........Task to plot total and cross-power spectra.
   PPAPP.........Applies Right minus Left phase difference to a 2nd data
                 set.
   PRTSD.........Prints contents of AIPS single-dish data sets.
   PRTSY.........Task to print statistics from the SY table.
   QUACK.........Flags beginning or end portions of UV-data scans.
   REAMP.........Scale visibility amplitudes by IF- or subarray-dependent
                 factor.
   RESEQ.........Renumber antennas.
   REWAY.........Computes weights based in rms in spectra.
   REWGT.........Modifies UV data re-scaling the weights only.
   RFI...........Look for RFI in uv data.
   RFLAG.........Flags data set based on time and freq rms in fringe
                 visibilities.
   RLCAL.........Determines instrumental right-left phase versus time (a
                 self-cal).
   RLCOR.........Corrects a data set for R-L phase differences.
   RLDIF.........Determines Right minus Left phase difference, corrects
                 cal files.
   RLDLY.........Fringe fit data to determine antenna R-L delay
                 difference.
   SDCAL.........Task to apply single dish calibration.
   SHOUV.........Displays uv data in various ways.
   SNBLP.........Plots selected contents of SN or CL files on a baseline
                 basis.
   SNCOR.........Applies user-selected corrections to the calibration SN
                 table.
   SNEDT.........Interactive SN/CL/TY/SY table editor using the TV.
   SNFIT.........Fits parabola to SN amplitudes and plots result.
   SNFLG.........Writes flagging info based on the contents of SN files.
   SNIFS.........Plots selected contents of SN, TY, SY, PC or CL files by
                 IF.
   SNPLT.........Plots selected contents of SN, SY, TY, PC or CL files
                 versus time.
   SNREF.........Chooses best reference antenna to minimize R-L
                 differences.
   SNSMO.........Smooths and filters a calibration SN table.
   SOLCL.........Adjust gains for solar data according to nominal
                 sensitivity.
   SPCAL.........Determines instrumental polzn. for spec. line UV data.
   SPFLG.........Interactive flagging of UV data in channel-TB using the
                 TV.
   SPLAT.........Applies calibration and splits or assemble selected
                 sources.
   SPLIT.........Converts multi-source to single-source UV files w
                 calibration.
   SPMOD.........Modify UV database by adding a model with spectral lines.
   SPRMS.........Plots spectral statistics of a selected subset of a uv
                 data set.
   SUFIX.........Modifies source numbers on uv data.
   SWAPR.........Modifies UV data by swapping real and imaginary parts.
   SWPOL.........Swap polarizations in a UV data base.
   SYPRT.........Task to print values from the SY table.
   SYSOL.........Undoes and re-does nominal sensitivity application for
                 Solar data.
   SYVSN.........Plots selected SY/TY data with SN solution values versus
                 time.
   TI2HA.........Modifies times in UV data to hour angles.
   TIORD.........Checks data for time baseline ordering, displays
                 failures.
   TRUEP.........Determines true antenna polarization from special data
                 sets.
   TVFLG.........Interactive flagging of UV data using the TV.
   TYAPL.........Undoes and re-does nominal sensitivity application.
   TYSMO.........Smooths and filters a calibration TY or SY table.
   UFLAG.........Plots and edits data using a uv-plane grid and the TV.
   USUBA.........Assign subarrays within a uv-data file.
   UV2MS.........Append single-source file to multi-source file.
   UV2TB.........Converts UV autocorrelation spectra to tables.
   UVAVG.........Average or merge a sorted (BT, TB) uv database.
   UVBAS.........Averages several channels and subtracts from uv data.
   UVCOP.........Task to copy a subset of a UV data file.
   UVFIT.........Fits source models to uv data.
   UVFLG.........Flags UV-data.
   UVFND.........Prints selected data from UV data set to search for
                 problems.
   UVFRE.........Makes one data set have the spectral structure of
                 another.
   UVGIT.........Fits source models to uv data.
   UVHGM.........Plots statistics of uv data files as histogram.
   UVHIM.........Makes image of the histogram on two user-chosen axes.
   UVHOL.........Prints holography data from a UV data base with
                 calibration.
   UVIMG.........Grid UV data into an "image".
   UVLIN.........Fits and removes continuum visibility spectrum, also can
                 flag.
   UVLSD.........Least squares fit to channels and divides the uv data.
   UVLSF.........Least squares fit to channels and subtracts from uv data.
   UVMLN.........Edits data based on the rms of the spectrum.
   UVMOD.........Modify UV database by adding a model incl spectral index.
   UVMTH......... Averages one data set and applied it to another.
   UVPLT.........Plots data from a UV data base in multiple ways.
   UVPRM.........Measures parameters from a UV data base.
   UVPRT.........Prints data from a UV data base with calibration.
   UVRFI.........Mitigate RFI by Fourier transform or fitting the circle.
   UVRMS.........Computes statistics of a selected subset of a uv data
                 set.
   VLABP.........VLA antenna beam polarization correction for snapshot
                 images.
   VLAMP.........Makes ANTAB file for phased VLA used in VLBI
                 observations.
   VLANT.........Applies VLA/EVLA antenna position corrections from OPs
                 files.
   VLOG..........Pre-process external VLBA calibration files.
   VPLOT.........Plots uv data and model from CC file.
   WETHR.........Plots selected contents of WX tables, flags data based on
                 WX.
   WIPER.........Plots and edits data from a UV data base using the TV.
   WTMOD.........Modifies weights in a UV data set.
   XYDIF.........Find/apply X minus Y linear polarization phase
                 difference.
   XYMOD.........Compute linear polarization point source model, applies
                 to data.

EXPLAIN SECTION


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