simulator.add - Function

Description

This function is very similar to create except that it will need an already created MS. The purpose of this function is to add in an MS data with from a telescope which is different in configuration from the one used in create (e.g trying to simulate VLA and GBT data in one MS file). Just like create the configuration parameters are set via the 'set' functions. No data is calculated, only the times, (u,v) coordinates, shadowing information, etc. The antenna configuration is specified with setconfig. It is quite simplistic in approach regarding fieldid's and spwid's etc. It assigned them a different number to what already exist in the MS even if they are physically the same.

Arguments

`shadowlimit`	Maximum fraction of geometrically shadowed area before flagging occurs
	`Allowed:`	`Double`
	`Default:`	`1e-6`
`elevationlimit`	Minimum elevation angle before flagging occurs
	`Allowed:`	`Quantity`
	`Default:`	`'10deg'`
`autocorrwt`	Weight to assign autocorrelations (0=none)
	`Allowed:`	`Float`
	`Default:`	`0.0`

Example

include 'simulator.g'

msim:=simulator();

include 'randomnumbers.g'
mrn:=randomnumbers()
\##RANDOMLY DISTRIBUTING 27 antennas
x:=50*(1:27%5)        + mrn.normal(0.0, 10.0, [27])
y:=10*(1:27-(1:27)%5) + mrn.normal(0.0, 10.0, [27])
z:=array(0.0, 27)

msim.setconfig('VLA', x, y, z, array(25.0, 27), array('alt-az', 27), 
	       array('VLA', 27),coordsystem='local')
\#SETTING DEFAULT SPECTRAL WINDOW
msim.setspwindow()
\# SETTING THE FIELD AS A 3 x 3 mosaic.
msim.setfield(1, 'M31SIM', dm.direction('j2000', '20:20:00.00',
	       '+40.0.0.0'), 1, 3, 3,1.0)
\# SETTING OBSERVATION TIME
msim.settimes('10s', '10s', T, '0s', '1800s')
#CREATING MS
msim.create('sd.ms', autocorrwt=0.0)

\#NOW SETTING SINGLE DISH OBSERVATION
x:=[0.]
y:=x
z:=y
msim.setconfig('GBT', x, y, z, array(100, 1), 'alt-az', 'GBT',
        coordsystem='local')

\#SETTING OBSERVING FIELD AS a 9x9 scans
\# note that this will create only a single field entry in the
\#ms.summary but 81 pointings entries are made in the pointing table. 

msim.setfield(1, 'M31SIM', dm.direction('j2000', '20:20:00.00', '+40.0.0.0'),
        1, 9, 9, 1.0)
\#SETTING SPW and TIME info 
msim.setspwindow()
msim.settimes('1s', '1s', T, '0', '600s')
\#ADDING THESE DATA POINTS TO THE MS
msim.add(autocorrwt=1.0)

Next: simulator.setconfig - Function Up: simulator - Tool Previous: simulator.create - Function Contents Index

	`Package`	`synthesis`
	`Module`	`simulator`
	`Tool`	`simulator`