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passmake

Section: User Commands (1)
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NAME

passmake - Create passband calibration set  

PERSON RESPONSIBLE

lgm  

CATEGORIES

calibration  

DESCRIPTION

PASSMAKE is a MIRIAD task that makes a baseline based passband calibration dataset, to be used by PASSFIT and CALAPPLY.  

PARAMETERS

vis
The passband calibrator visibility dataset. Only one input dataset allowed. This is normally an observation of a passband calibrator (strong continuum source) observed in the same narrow-band correlator mode as the science source; alternatively, it may be a passband calibrator observed in the broad-band mode (correlator mode 4, 40 MHz) provided the frequencies observed in broad-band mode include the frequencies observed in the narrow-band observed for the science source. No default.
select
This keyword selects the subset of the visibility data to be processed. There are a number of subcommands, which may be abbreviated. Each may be prefixed with a plus or minus sign to indicate using or discarding the selected data. Many subcommands can be given (separate them by commas). Examples:

See also documentation for subroutine selprobe(), which may very well differ slightly from this document.

Subcommands include:

  time(t1,t2)
Select data between times t1 and t2 (UT). Times are in the format:
  yymmmdd.fff
or
  yymmmdd:hh:mm:ss.s
Various abbreviations are possible. If no date part is given, then the time matchs all data (regardless of its date) for the given time of day. e.g. time(03OCT30:05:41:08,03OCT30:05:43:09)

  antennae(a1,a2,...)(b1,b2...)
Select all baselines pairs formed between first and second list of antennas. The second list is optional and defaults to all antennas.

  uvrange(uvmin,uvmax)
Select visibilities with uv radius between uvmin and uvmax (in kilo wavelenghts). If only one value is given, uvmin is taken as zero.

  uvnrange(uvmin,uvmax)
Select visibilities with uv radius between uvmin and uvmax (in nanoseconds). If only one value is given, uvmin is taken as zero.

  visibility(n1,n2)
Select visibilities numbered n1 to n2 inclusive.

  increment(inc)
Select every inc'th visibility.

  ra(r1,r2)
Select visibilities whose RA is in the range r1 to r2. RAs are given in the format
  hh:mm:ss
or
  hh.hhh
Various abbreviations are possible.

  dec(d1,d2)
Select visibilites whose DEC is in the range d1 to d2. Declinations are given in the format
  dd:mm:ss
or
  dd.ddd
Various abbreviations are possible.

  ha(h1,h2)
Selects on hour angle (values in decimal hours or hh:mm:ss)

  lst(lst1,lst2)
Selects on LST (values in decimal hours or hh:mm:ss)

  elevation(el1,el2)
Selects on elevation (values in degrees)

  dra(p1,p2)
Select visibilities for which the RA of the pointing center is offset from the main pointing center by between p1 and p2 arcseconds.

  ddec(p1,p2)
Select visibilities for which the DEC of the pointing center is offset from the main pointing center by between p1 and p2 arcseconds.

  dazim(p1,p2)
Select visibilities for which the DAZIM offset is between p1 and p2 arcseconds.

  delev(p1,p2)
Select visibilities for which the DELEV offset is between p1 and p2 arcseconds.

  pointing(p1,p2)
Select visibilities with the rms pointing error in the range p1 to p2 arcseconds. If only one number is given, p1 is taken as 0.

  polarization(p1,p2,p3,...)
Select visibilities on the basis of their polarization/Stokes parameter. p1,p2,p3,... can be selected from "i,q,u,v,xx,yy,xy,yx,rr,ll,rl,lr" Conversion between polarizations Stokes parameters (e.g. convert linears to Stokes) is not performed by this mechanism (see keyword stokes).

  source(SRCNAM1,SRCNAM2,...)
Select correlations from the particular source. Several sources can be given. An asterisk in the source name is treated as a wildcard. Note that the sourcename match is done IGNORING CASE.

  purpose(TYPE)
Select based on the intent/purpose of the observation. Introduced in CARMA, where the letters B (bandpass), F (fluxcal), G (gaincal), P (polarization), R (radio pointing), S (science) and O (other) are used. Multiple letters from this set can be chooses. No wildcards allowed.

  seeing(r1,r2)
Select on seeing monitor rms path length (in microns). The UV variable used is smonrms for ATCA, rmspath for CARMA

  frequency(f1,f2)
Select correlations, where the sky frequency of the first correlation is in the range f1 to f2 (in GHz). If only a single frequency is given, then correlations are selected if the first correlation is within 1% of the given frequency. Note this selects the whole record. This may include several spectral-windows whose frequency is quite different from the first correlation in the first window.

  amplitude(amplo,amphi)
Select any correlation, where the amplitude is between "amplo" and "amphi". If only one value is given, then "amphi" is assumed to be infinite.

  shadow(d)
Selects data that would be shadowed by an antenna of diameter "d" meters. If "d" is zero, then the actual diameter of the antennas (if known) is used. If some data is shadowed, it is advisable to use an antenna diameter value greater than the physical antenna size (e.g. 20% larger).

  bin(b1,b2)
Select visibilities which have pulsar bin numbers in the range b1 to b2 inclusive. If b2 is omitted, just pulsar bin b1 is selected.

  on(n)
This is used with single dish observations, anbd selects based whether the "on" variable in the data is on (1) or off (0).

  auto
This is used with files that contain a mix of autocorrelations and crosscorrelations. This selects just the autocorrelation data.

  window(w1,w2,...)
Select by spectral window (IF band in AIPS terminology). See the help on window for more information.

  or
The list of subcommands before and after the 'or' are "ored" together.

  and
Default ??? Default: all data selected.
gcal
The phase and amplitude gains solution to apply to data, usually obtained from using calfit on broad-band observations of the passband calibrator before and after the narrow-band observations; it is not used,needed? for mode = self. Default is to apply NO gains solution.
aver
Type of time-averaging to apply to passband data. Choices are ``vector'', ``scalar'' or ``self calibration''. If self-calbration is selected, the individual digital correlator channels are divided by the wideband digital correlator channel AT EACH TIME INTERVAL, then vector averaged. aver=Self-cal overrides user input for 'mode'. lower sidebands. Default: vector
mode
Method for normalizing the digital correlator channels relative to the USB and LSB wide-band digital channels. Choices are ``cross'' and ``self''. Cross mode normalizes the channels relative to the wide-band data obtained before and after the narrow-band passband observation, using the gain file specified by gcal. The channel data are divided at each time interval by the interpolated fit and averaged according to values of aver. Self mode normalizes the channel data relative to the wideband digital correlator by dividing the averaged channel data by the averaged wideband data; the division is done after averaging according to the value of aver. Default is ``cross'' if a gcal file is specified. Default is ``self'' is no gcal file is specified.
pcal
Name for output passband calibration data file. This file may be used as an input to calapply to calibrate the passband of a dataset or passfit to interactively fit low order polynomials. No default.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

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Time: 18:35:38 GMT, July 05, 2011