Publication Date:
2022-05-26
Description:
On the Ocean Bottom Seismometer Augmentation to the Philippine Sea Experiment
(OBSAPS, April-May, 2011, R/V Revelle), a VLA and six OBSs were deployed to listen to
an active acoustic source, a J15-3. This report describes the hardware and software used to
control and record the acoustic transmissions from the source. Some significant features of
the system are: 1) The system transmits general user-defined source functions, such as Msequences
(.SIO files). 2) In addition to controlling the source waveform, the system also
records six real-time channels in binary files with user-selectable lengths: the monitor
hydrophone mounted near the source, the power amplifier voltage and current, the depth of
the source, sonobuoy data (when deployed) and an IRIG-B time reference. Files are output
in .AUV format with a precision GPS-based time stamp in the file name. 3) The
transmission start time along with ADC and DAC sample rates are disciplined to GPS time.
4) A convenient, Labview based, user interface provides real-time source control and
monitoring. 5) The software provides parsing and logging of gyro and GPS NMEA
sentences. The system, which was based on an earlier system from Scripps MPL, worked
well on OBSAPS and is available for future projects.
Description:
Funding was provided by the Office of Naval Research under Contract Nos. N00014-10-1-0994
and N00014-10-1-0987.
Keywords:
Underwater acoustics
;
Ambient sounds
Repository Name:
Woods Hole Open Access Server
Type:
Technical Report
Format:
application/pdf
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