Remote Login (23 March 2020)
The computers can be accessed remotely using SSH and VNC. Since I use Linux (Ubuntu) these instruction are for that OS.
To VNC into Helios, open a terminal and type the following command:
ssh -L 5902:helios.solar.pvt:20000 firstname.lastname@example.org
I then open Remmina Remote Desktop Client. Make sure VNC is selected at the top left. Type in:
and enter the password when prompted.
The Helios display should now be visible.
Occasionally, the VNC connection will be lost. If this occurs the following procedure need to be performed.
From a new terminal window type:
ssh -L 8887:helios.solar.pvt:22 email@example.com
From another terminal issue the command:
ssh -p 8887 sched@localhost
Now type in:
Now restart the VNC client.
Update Antenna Pointing (17 March 2020)
Access the Pipeline Computer.
From the terminal, start ipython:
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.
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:
To obtain the pointing offsets:
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
The antenna pointing adjustment is typically performed once per month.
The Schedule window show the currently running schedule as shown below.
The left side of the window shows each of the scripts that is to be run. The orange bar shows the task that is currently being run.
The right side of the window shows each command that is to be run in the current script.
At the bottom of the window are a series of buttons. The STOP button will stop at the current script. Once stopped, the remaining buttons will become active.