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simulator - Constructor

	Package	synthesis
	Module	simulator
	Tool	simulator

Construct a simulator tool

Synopsis
simulator()

Description
This is used to construct simulator tools. A simulator tool can either be instantiated from an existing MeasurementSet, predicting and/or corrupting data on the given coordinates, or it can be used to create a fundamentally new MeasurementSet from descriptions of the array configuration and the observational parameters. This constructor takes no arguments and is useful for making a simulator tool which will make a MeasurementSet from scratch. In order to do this, you must also run setconfig, setfield, setspwindow, setfeed, and settimes. Creating the actual MS is performed by create. Data can be predict-ed and then corrupted-ed. In this example, we read in the antenna coordinates from an ASCII file:

Arguments

Returns
simulator tool

Example

  tabname := 'VLAC.LOCAL.TAB';  asciifile := 'VLAC.LOCAL.STN'
  mytab := tablefromascii(tabname, asciifile);
  xx:=[]; yy:=[]; zz:=[]; diam:=[];
  xx := mytab.getcol('X');  
  yy := mytab.getcol('Y');
  zz := mytab.getcol('Z');
  diam := mytab.getcol('DIAM');
#
  mysim := simulator();
# do configuration
  posvla := dm.observatory('vla');  #  dm.observatory('ALMA') also works!
  mysim.setconfig(telescopename='VLA', x=xx, y=yy, z=zz, dishdiameter=diam, 
	        mount='alt-az', antname='VLA',
                coordsystem='local', referencelocation=posvla);

  mysim.settimes( integrationtime='60s', gaptime='10s', starttime='0h',
                stoptime='2h', referencetime='51483.1877d');

  dir0 := dm.direction('b1950',  '0h0m0.0', '0d0m0.0') 
  mysim.setfield( row=1, sourcename='Test_A', sourcedirection=dir0,
                integrations=1, xmospointings=1, ymospointings=1,
                mosspacing='0deg');
  dir1 := dm.direction('b1950', '1h0m0.0', '30d0m0.0') 
  mysim.setfield( row=2, sourcename='Test_B', sourcedirection=dir1,
                integrations=1, xmospointings=3, ymospointings=1,
                mosspacing='0deg');

  mysim.setspwindow( row=1, spwname='XBAND', freq='8.0GHz',
		deltafreq='50MHz', freqresolution='50MHz',
		nchannels=2, stokes='RR LL');

  mysim.setfeed(mode='perfect R L');

  mysim.create(newms='NEW1.MS',  shadowlimit=0.001, 
                elevationlimit='8.0deg',autocorrwt=0.2 );

  mysim.predict(modelimage='M31.MOD');
  mysim.close();