2.4.1.0 simulator.setoptions

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simulator.setoptions - Function

2.4.1 Set various processing options

Description

Set options for predict. See also imager help.

To simulate single dish data, use gridft=SD and gridfunction=PB.

To invoke primary beam convolution in the uv domain, use ftmachine=”mosaic”. This is the only option that allows heterogeneous array simulation - see the example below and help sm.setvp for more details.

Arguments


Inputs
ftmachine	Fourier transform machine. Possibilities are ’ft’, ’sd’, ’mosaic’
	allowed:	string
	Default:	ft ’ft’
cache	Size of gridding cache in complex pixels
	allowed:	int
	Default:	0
tile	Size of a gridding tile in pixels (in 1 dimension)
	allowed:	int
	Default:	16
gridfunction	Gridding function. String: ’SF’—’BOX’—’PB’
	allowed:	string
	Default:	SF ’SF’
location	Location used in phase rotations. Position Measure of Coordinates of array location. E.g me.position(’ITRF’, ’30.5deg’, ’-20.2deg’, ’6000km’) or me.observatory(’ALMA’)
	allowed:	any
	Default:	variant ALMA position measure
padding	Padding factor in image plane (>=1.0)
	allowed:	double
	Default:	1.3
facets	Number of facets
	allowed:	int
	Default:	1
maxdata	Maximum data to write to a single TSM file (MB)
	allowed:	double
	Default:	2000.0
wprojplanes	Number of projection planes when using wproject as the ft-machine
	allowed:	int
	Default:	1

Returns
bool

Example

    # set some options
    sm.setoptions(cache=10000000, tile=32, gridfunction=’BOX’, me.location(’vla’))

    # set ftmachine to invoke uv-domain primary beam convolution, and use that
    # to simulate a heterogeneous ALMA 7m+12m array.
    from simutil import simutil
    u=simutil()
    configdir=casa.values()[0][’data’]+"/alma/simmos/"
    x,y,z,d,padnames,telescope,posobs = u.readantenna(configdir+"alma.cycle5.1.cfg")
    x2,y2,z2,d2,padnames2,telescope2,posobs2 = u.readantenna(configdir+"aca.cycle5.cfg")

    sm.open("new.het.alma.ms")
    sm.setconfig(telescopename="ALMA",
      x=np.append(x,x2),y=np.append(y,y2),z=np.append(z,z2),
      dishdiameter=np.append(d,d2),
      mount=[’alt-az’], padname=np.append(padnames,padnames2).tolist(),
      coordsystem=’global’, referencelocation=posobs)
    sm.setspwindow(spwname="band1", freq="330GHz",
      deltafreq="1GHz",freqresolution="1GHz",nchannels=1,stokes=’XX YY’)
    sm.setfeed(mode=’perfect X Y’,pol=[’’])
    sm.setlimits(shadowlimit=0.01, elevationlimit=’10deg’)
    sm.setauto(0.0)
    sm.setfield(sourcename="src1",
      sourcedirection="ICRS 10:00:00.00 -23.01.22",
      calcode="OBJ", distance=’0m’)
    sm.setfield(sourcename="src2",
      sourcedirection="ICRS 10:00:00.00 -23.01.32",
      calcode="OBJ", distance=’0m’)
    sm.settimes(integrationtime="10s", usehourangle=True,
      referencetime=me.epoch(’TAI’, "2012/01/01/00:00:00"))
    etime="600s"
    sm.observe(sourcename="src1", spwname="band1",
      starttime=qa.mul(-1,qa.quantity(etime)),
      stoptime=qa.quantity(0,"s"));
    sm.observe(sourcename="src2", spwname="band1",
      starttime=qa.quantity(0,"s"),
      stoptime=qa.quantity(etime));
    sm.setoptions(ftmachine="mosaic")
    sm.predict(imagename="point.ra10.image")
    sm.done()

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