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: http://www.atnf.csiro.au/vlbi/wiki/index.php?n=Main.ASKAPObservingSummary
Дата изменения: Unknown Дата индексирования: Tue Apr 12 18:03:30 2016 Кодировка: |
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ASKAPObservingSummaryASKAP ObservingGeneral OverviewTwo different antenna are used for observing at ASKAP - AK07 has an L-band feed permanently installed while AK32 has an X-band feed installed. Both are connected to the control room by RF over fibre technology and fed into an RF switch to allow recording from one of the telescopes. There are 3 main processes run for ASKAP observing. askap_drv is the main telescope control. It itself consists of a terminal based control process and a GUI. askap_drv must be running. VLBI scheduling is run from a process called "vlbi_drv", while the actual recording is via a command line process called px14_record. Generally VLBI observers are not expected to start any of these processes, though they do crash/freeze from time to time. See the test screen cast covering these notes at: http://www.atnf.csiro.au/vlbi/videos/askap.html Observing startupNote that the antenna control and recording (px14_record) are totally separate. You can restart one without affecting the other. Antenna controlMake sure previous instances of askap_drv and vlbi_drv are not running. ^C any stalled processes if necessary. The driver task "askap_drv" needs to run first for communicating with the antenna. This can be done by: > cd askap/run > askap #n where #n is the CETCI antenna number. 26 for Ak32 (X-band) or 19 for Ak07 (L-band). e.g. " If the antenna is stowed ("
VLBI scheduleTo run a VLBI schedule, use > cd askap/run > vlbi_drv ../sched/vt999a-ak.psn (replace Recording DataData is recorded using the program px14_record. It is a standalone terminal based program which reads data off the installed PCI sampler card and writes formatted data to local disk (or eVLBI network streaming). There are currently (24/3/2015) 3 data disks - > px14_record -o <EXPER> -t <TT>h -v <VV>
An example usage is: > df -h > cd /mnt/raid_1 > mkdir vt999a > cd vt999a > px14_record -o vt999a -t 10h -v 12 Typical output is: 1.0 nbuf=4646 Rate=514 Stddev=1123.7,1569.4 Elapsed 00:00:19 vt999a_083_021047.lba -15.87 This shows time since last update (1.0 sec), number of bufferes recorded, approx recording data rate, StdDev of the two polarisations (from 12 bit data), Elapsed time since starting, current file name and clock offset in millisec. Notes:
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MonitoringRegularly (10-15min) check the following. The drive system on ASKAP is know to fail moderately regularly
TroubleShooting
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