An Investigation of the Sources and Characteristics of the Noise Component in SeaMarc II Echo Signals.

As is well known, the SeaMarc II towfish system was lost at sea during a scientific survey cruise in the Southern Ocean near the beginning of this project. Work was immediately begun on the design and construction of a replacement mapping system to be called HAWAII MR1. The signal processing for thi...

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Bibliographic Details
Main Author: Zisk, Stanley
Other Authors: HAWAII UNIV HONOLULU SCHOOL OF OCEAN AND EARTH SCIENCE AND TECHNOLOGY
Format: Text
Language:English
Published: 1996
Subjects:
Physical and Dynamic Oceanography
Recording and Playback Devices
Acoustics
*ECHOES
*REVERBERATION
*ACOUSTIC RECORDING SYSTEMS
SIGNAL PROCESSING
SIGNAL TO NOISE RATIO
SHALLOW WATER
BATHYMETRY
REPLACEMENT
MAPPING
NOISE
DEEP WATER
OCEAN BOTTOM
ACOUSTIC IMPEDANCE
DIGITAL RECORDING SYSTEMS
DEEP SCATTERING LAYERS
SEAMARC II
HAWAII MR1 MAPPING
ECHO SIGNALS
Southern Ocean
Online Access:http://www.dtic.mil/docs/citations/ADA327339
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA327339
Description
Summary:As is well known, the SeaMarc II towfish system was lost at sea during a scientific survey cruise in the Southern Ocean near the beginning of this project. Work was immediately begun on the design and construction of a replacement mapping system to be called HAWAII MR1. The signal processing for this system was designed based on the crude and incomplete information obtained earlier from one short series of noise measurements that had been made on SeaMarc II with experimental modifications. In the new MR1 system, the recorded signal consisted of digital, complex samples of the acoustic echo (i.e. in-phase and quadrature components, referenced to transmitter sinusoidal waveform). The entire duration of the echo signal was recorded, including the entire water column reverberation and the subsequent seafloor echoes, usually out to 70 - 80 degrees incidence angle.

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