Imaging of Total Power Raster Scans

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8.2.2.2 Imaging of Total Power Raster Scans

This example illustrates the use of sdtpimaging for the total power raster scans of the Moon taken at ATF.

Figure 8.5: Total power data display using sdtpimaging, with calmode=’baseline’. The top panel shows uncalibrated data versus row numbers.The middle panel shows baseline fitting of each scan (only shown here the last scan). The bottom panel shows the calibrated (baseline subtracted) data.

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# The data used here (uid___X1e1_X3197_X1.ms) is the total power
# raster scans of the Moon taken at ATF (with both antennas).
# It is in MS format which was converted from the ASDM format.

# Do data plotting only
default(sdtpimaging)
inp()
plotlevel=2
# select antenna 1 (Vertex antenna)
antenna=’1’
infile=’uid___X1e1_X3197_X1.ms’
sdtpimaging()

# Now, rerun sdtpimaging to do actual data reduction (applying
# baseline subtraction from each scan, and then do imaging).
#
# Do baseline subtraction
calmode=’baseline’
masklist=[30] # use 30 data points from each end of scan for fitting
# Do imaging
createimage=True
outfile=’moon.im’
imagesize=[200,200]
cell=[0.2] # in arcmin
phasecenter=’AZEL 187d54m22s 41d03m0s’
ephemsrcname=’moon’ # specify ephemeris source name (can be omitted)
plotlevel=1
#plotlevel=2 to see progress of each fitting
sdtpimaging()

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