Index Return to Main Contents

*vis*- Input visibility data file. No default. This can (indeed should) contain multiple channels and spectral windows. The frequency set-up can vary with time.
*line*- Standard line parameter, with standard defaults.
*edge*- The number of channels, at the edges of each spectral window, that are to be dropped. Either one or two numbers can be given, being the number of channels at the start and end of each spectral window to be dropped. If only one number is given, then this number of channels is dropped from both the start and end. The default value is 0.
*select*- Standard uv selection. Default is all data.
*flux*- Three numbers, giving the source flux, the reference frequency (in GHz) and the source spectral index. The flux and spectral index are at the reference frequency. If not values are given, then SmaMFCAL checks whether the source is one of its known sources, and uses the appropriate flux variation with frequency. Otherwise the default flux is determined so that the rms gain amplitude is 1, and the default spectral index is 0. The default reference frequency is the mean of the frequencies in the input data. Also see the `oldflux' option.
*refant*- The reference antenna. Default is 3. The reference antenna needs to be present throughout the observation. Any solution intervals where the reference antenna is missing are discarded.
*minants*- The minimum number of antennae that must be present before a solution is attempted. Default is 2.
*interval*- This gives one or two numbers, both given in minutes, both being used to determine the extents of the gains calibration solution interval. The first gives the max length of a solution interval. The second gives the max gap size in a solution interval. A new solution interval is started when either the max times length is exceeded, or a gap larger than the max gap is encountered. The default max length is 5 minutes, and the max gap size is the same as the max length.
*weight*-
This gives different ways to determine weights (wt) prior to
solving for bandpass:
-1 -> wt = 1; the same weighting method as used in MFCAL. 1 -> wt ~ amp0**2/var(i); for a normalized channel visibility, the reduced variance is proportional to amp0**2/var(i), where amp0 is the amplitude of the pseudo continuum and var(i) is the variance of visibility for the ith channel. 2 -> wt ~ amp0**4/var(i)**2;

Default is 2 for SMA and -1 for other telescopes.if you have stable phase, use -1; if the phase stability is poor, use 1 or 2; for a larger planet, 2 is recommended.

For antenna gains' solver:

-1 -> wt = 1; the same weight method that is used in MFCAL. >0 -> wt = 1/var, where var is the visibility variance.Defualt is 1/var.

*options*-
Extra processing options. Several values can be given, separated by
commas. Minimum match is used. Possible values are:
delay Attempt to solve for the delay parameters. This can be a large sink of CPU time. nopassol Do not solve for bandpass shape. In this case if a bandpass table is present in the visibility data-set, then it will be applied to the data. interpolate Interpolate (and extrapolate) via a spline fit (to the real and imaginary parts) bandpass values for channels with no solution (because of flagging). If less than 50% of the channels are unflagged, the interpolation (extrapolation) is not done and those channels will not have a bandpass solution oldflux This causes SmaMFCAL to use a pre-August 1994 ATCA flux density scale. See the help on "oldflux" for more information. msmooth Do moving average of the uv data (the real and imaginary parts) using the keyword smooth parameters specified prior to solving for bandpass. opolyfit Do least-square fit to the bandpass solutions (the real and imaginary parts) with an orthogonal polynomial of degree n which can be given in keyword polyfit. wrap Don't unwrap phase while do fit or smooth the uv data. averrll In the case of solving for bandpass of dual polarizations, averrll gives vector average of rr and ll bandpass solutions; the mean value is written into the bandpass table for each of rr and ll.

*smooth*
This gives three parameters of moving smooth calculation of the
bandpass/gain curves
smooth(1) = K parameter k giving the length 2k+1 of the averaging
*polyfit*
polyfit gives a degree of orthogonal polynomial in least-sqaure
fit to the bandpass/gain curves. Default is 3.
polyfit: 1 (linear), 2 (parabolic), 3 (cubic), ....
*tol*-
Solution convergence tolerance. Default is 0.001.

interval; default is 3.smooth(2) = L order of the averaging polynomial l; default is 1. smooth(3) = P probability P for computing the confidence limits;

default is 0.9.

- NAME
- PERSON RESPONSIBLE
- CATEGORIES
- DESCRIPTION
- PARAMETERS

This document was created by man2html, using the manual pages.

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