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smafix

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NAME

smafix - Plot and fit Tsys and do Tsys corrections.  

PERSON RESPONSIBLE

jhz  

CATEGORIES

plotting, analysis and uvdata correction  

DESCRIPTION

SmaFix plots and does least square fitting with an order of polynomial to the antenna-based Tsys measurements. SmaFix also applies the Tsys corrections to the visibilies. SmaFix can handle upto 100 sources per file. For options of polynomial fitting to the data of individual sources separately, the maximum number sources that can be handled in SmaFix is 48.  

PARAMETERS

vis
The name of the input data-set. No default.
out
The name of the output data-set with corrections. No default.
device
The PGPLOT plotting device to use. The default is no plot.
log
The log to give a listing of the variables. The default is no log.
xaxis
Variable to plot on the X axis. Currently supports "time" and antel". Default is "time".
yaxis
Variable to plot on the Y axis. Default is "systemp". Currently supports only "systemp".
nxy
Number of plots in the x and y directions. The default varies.
bant
An array of antenna ids of which the antennas are corrupted in Tsys measurements. example: bant=4, 8 indicates that the Tsys values of both the antennas 4 and 8 are corrupted.
fscal
An array of scaling factors to scale the Tsys values from the good antenna (gant) to those of bad antennas (bant):

Tsys_bant(i) = fscal(i) * Tsys_gant.

Default is unity.

gant
A antenna id with good Tsys measurements which will be used to replace the Tsys of the antennas assigend with bant. example: gant=1 assigns antenna 1 with good Tsys to replace the Tsys values of antennas 4 and 8. Defaults are no replacements.
xrange
The min and max range along the x axis of the plots. The default is to autoscale. Note that for "time" should be given in normal Miriad time format (either absolute time or time-of-day).
yrange
The min and max range along the y axis of the plots. The default is to autoscale. Note that for "time" should be given in normal Miriad time format (either absolute time or time-of-day).
dofit
A degree polynomial fit. Value 2 is for parabolic, 3 for cubic. Default or a value of 0 and smaller corresponds to no fit to perform.
options
Extra processing options. Several can be given, separated by commas. Minimum match is used.
  "dtime"    If the x-axis is "time", plot the time in fractions
             of a day. The default is to plot in hh:mm:ss.
  "compress" If the variable is a 2D array of values, average
             the variables along the second dimension.
  "overlay"  By default, when a variable takes on several values,
             each is plotted on a separate plot. The overlay
             option makes a single plot.
  "unwrap"   Unwrap the phases on the yaxis variable. Cannot unwrap
             an xaxis variable. By default phases are not unwrapped.
  "tsyscorr" If the y-axis is "systmp", Tsys correction will be
             applied. 
             By default, no Tsys corrections are made.
  "dosour"   If dofit is true, then the polynomial fit is source
             dependent.
             By default, no source separation is made.
  "tsysswap" Swaps the values of systemp with a polynomial fit
             in the Tsys corrections, saves the values from 
             the polynomial fit to replace the original
             systemp and creates a new variable systmp to
             save the original Tsys measurements.
             For the cases of options=tsysfix or dofit > 0, gant > 0,
             tsysswap is the defualt.
  "all"      uses all data associated with flagged and unflagged 
             visibilties. The default uses only unflagged
             (good) data.

  "tsysfix"  uses the polynomial fit to Tsys from the unflagged (good) 
             data to interpolate the Tsys at flagged data points
             and replaces only the bad Tsys values with the polynomial 
             fit in the case of the Keyword dofit = 1 or greater. 
             The flag state will be reset to 'unflag' for all the 
             visibilities except for those with illegal polarization 
             states. Warning: this options will also reset the flag 
             states passed from the SMA online system.

             By default (both tsysswap and tsysfix are not chosen
             in options), the original Tsys measurements will
             be used in the Tsys corrections and the variables
             from the input uvdata file remains unchanged if
             options=tsyscorr is chosen.


 

Index

NAME
PERSON RESPONSIBLE
CATEGORIES
DESCRIPTION
PARAMETERS

This document was created by man2html, using the manual pages.
Time: 18:35:38 GMT, July 05, 2011