When UHDAS starts, it starts in the Control Tab. This location
controls three aspects of UHDAS:
- Cruise Setup: Start or
End a cruise. (By cruise we mean creating or linking to specific
directories
on the internal hard drive and the external USB drive.)
- Data Recording: Start or
Stop data recording. (By recording we mean actually acquiring data from
the instruments and writing it to the cruise directories created in
step 1).
- ADCP Collection parameters:
OS38 and NB150
(1) Cruise
Setup:
Start Cruise:
This asks the user for a cruise identification, which should be a name
like "nbp0407" or "lmg0413a". This name is used to create
the directory /home/data/cruiseid which will support logging
and processing for both ADCPs. UHDAS also creates a symbolic link
from the generic name "/home/adcp/cruise" to the new logging
directory.
After creating this directory and link, UHDAS is ready for data
logging.
It is possible to resume logging to a previous cruise, e.g.,
if you stopped both data acquisition and the cruise when
all you really wanted to do was to stop data acquisition. Enter the
previous
cruise name. UHDAS will tell you it exists and ask you to confirm that
you
want to continue. Answer "Yes".
End Cruise:
After data logging is stopped, the user can choose "End Cruise". This
tells UHDAS to clean up temporary files from the (now finished) cruise,
copy several directories to /home/data/cruiseid
for archiving purposes, and remove the symbolic link
"/home/adcp/cruise". Final copying of files to backup disks takes
place at this stage and may take some time -- be patient as UHDAS
completes
its work. It may take up to 15 minutes. It is important to run
"End cruise" prior to unmounting the USB drive, since this step copies
the last of the data to the drive.
It is possible to resume logging to a previous cruise, e.g.,
if you stopped both data acquisition and the cruise when
all you really wanted to do was to stop data acquisition. Choose
to "Start Cruise" and enter the previous
cruise name. UHDAS will tell you it exists and ask you to confirm that
you
want to continue. Answer "Yes".
(2) Data
Recording:
Start Recording:
Data logging (recording) can only begin if a cruise has been
started (see above).
When the "Start Recording" button is pushed, UHDAS starts a dialog with
each of the ADCPs in succession, displaying the dialog in the Terminal
Tab. Once communication has been established with all ADCPs, it
turns on data acquisition for each of the other configured serial
inputs, and switches over to the Monitor Tab for display. All
logging is started with this button. For more information,
see the UHDAS
logging page.
Stop Recording:
All data logging is stopped with this button. A cruise can only
be ended if data recording is stopped.
(3) ADCP
Collection parameters:
Each ADCP has a default configuration which is available for viewing
and modification. Except for toggling bottom track mode OFF or
ON, these parameters should never be changed. Default parameters
for each instrument are contained in a file that is read by UHDAS when
it starts. Values in the gui can be entered at any time, but only
take effect when data recording is (re)started.
To toggle bottom tracking mode, click "Stop Recording", (wait a few
seconds for it to respond). All data logging will stop. Then click the
ON/OFF button for bottom tracking for the instrument(s)
of interest, and click "Start Recording". All data logging
will start again.
NB150:
This instrument is a higher frequency than the OS38 and is capable of
much higher vertical resolution. Its range is only 200-300m on
the icebreakers, because of the presence of the protective
window. The NB150 is set with 8 m bin size.
OS38:
Ocean Surveyors are capable of running in either narrowband or
broadband mode.
Narrowband mode has slightly deeper profiling than broadband mode but
lower resolution;
broadband mode has higher resolution than narrowband mode at
the expense of depth penetration. The Ocean Surveyor is also
capable of interleaving these pings, which is what we prefer. We
have defaults set up for bottom track ON, 12 m bins in broadband (bb)
mode,
and 24 m bins in narrowband (nb) mode. Our processing treats these data
streams as if they came from separate instruments, though work is
underway to combine them into a high-resolution, deep-profiling product.
UHDAS Overview
next
(Terminal Tab)
