32-Channel Digitizer for a Moored Hydrophone Array for Low-to-Mid Frequency Shallow-Water Acoustics Experiments
NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF OCEANOGRAPHY
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The long-term goal is the acquisition of an in situ, 32-channel digitizer capable of sampling at a rate of 8kHz, with a maximum depth rating of 1 km and data storage capacity sufficient to support continuous recording for a 10-day deployment. This system, when coupled to an existing, 32-channel hydrophone array owned by the Naval Postgraduate School, will enable future research efforts to investigate three-dimensional effects on sound propagation caused by a sharp front, large amplitude internal waves, and significant bathymetric changes, which are common environmental features in a shelf-slope environment. The procurement of the proposed 32-channel digitizer will help to fill the data and knowledge gaps that exist in the shallow-water acoustics research community. The first deployment will be in the next multi-institutional shallow-water acoustics experiment that is targeted for the FY14 timeframe. This project will obtain an underwater digitizer system for an existing 32-element, 155m aperture hydrophone array. The combined digitizer and array system will enable the measurement of the horizontal or vertical properties depending on the moored orientation of the low-to-mid frequency 500 3,000 Hz shallow-water sound field. This electronics system will be capable of 8kHz continuous sampling over a 10-day period an Analog-to-Digital converter resolution of 16-bits a correctable clock stability of 1 ms over the deployment and a 1km maximum operating depth.
- Hydrology, Limnology and Potamology