OBSANP data acquisition system : operator's manual and system overview
OBSANP data acquisition system : operator's manual and system overview
Date
2013-10
Authors
McPeak, Sean P.
D'Spain, Gerald L.
Stephen, Ralph A.
von der Heydt, Keith
Worcester, Peter F.
D'Spain, Gerald L.
Stephen, Ralph A.
von der Heydt, Keith
Worcester, Peter F.
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As Published
Date Created
Location
North Pacific Ocean
DOI
10.1575/1912/6595
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Keywords
Melville (Ship) Cruise OBSANP
Hydrography
Hydrography
Abstract
On the Ocean Bottom Seismometer Augmentation in the North Pacific Experiment (OBSANP,
June-July, 2013, R/V Melville), a VLA and twelve 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 M-sequences (.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, Vref signal driving the power
amplifiers and an IRIG-B time reference. Files are output in .AUV format with a precision GPSbased
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 OBSANP and is available for future projects.
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Citation
McPeak, S. P., D’Spain, G. L., Stephen, R. A., von der Heydt, K., & Worcester, P. F. (2013). OBSANP data acquisition system: operator’s manual and system overview. Woods Hole Oceanographic Institution. https://doi.org/10.1575/1912/6595