Owen's Notes: Difference between revisions
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== Helios Displays == | == Helios Displays == | ||
[[ | [[File:Schedule_Window.png|The Schedule Window]] | ||
[[File:Example-X-BW.png|200px|thumb|right|An example of the Y-beam widths for each antenna]] | [[File:Example-X-BW.png|200px|thumb|right|An example of the Y-beam widths for each antenna]] | ||
Revision as of 22:28, 19 March 2020
Update Antenna Pointing (17 March 2020)
Access the Pipeline Computer.
From the terminal, start ipython:
ipython --pylab
Import the calibration and Time libraries:
import calibration as cal
from util import Time
Load up the solar pointing scans for a given date and time.
x,y,qual=cal.solpntanal(Time('2020-03-17 18:30'))
The above command will load the scans from the 17 March 2020 18:30 UT.
To view the beam widths as a function of frequency for each antenna and polarisation:
cal.sp_bsize(x,y)
To obtain the pointing offsets:
xoff,yoff,dx,dy=cal.sp_offsets(x,y)
This will display the offsets for each antenna and feed. Ideally the offsets should be at zero. If particular antennas significantly deviate from zero then a correction can be made.
For example, the following command will adjust the pointing offsets for antennas 6 to 8, 10 and 13:
cal.offsets2ants(Time('2020-03-17 18:30'),xoff,yoff,antst='ant6 ant7 ant8 ant10 ant13')
The newer antennas with the alt-az drives that have had tracking updated will need to be rebooted. From the Schedule Window issue the commands:
reboot 1 ant6-8
tracktable sun_tab.radec 1 ant6-8
track ant6-8
The antenna pointing adjustment is typically performed once per month.
Helios Displays
