The U.S. Navy is preparing a Draft Environmental Impact Statement/Overseas Environmental Impact Statement (DEIS/OEIS) for the proposed Undersea Warfare Training Range (USWTR). The DEIS includes an assessment of the effects of Navy sonars on marine mammals during exercises to occur on the range as required by the Marine Mammal Protection Act (MMPA). The Naval Undersea Warfare Center (NUWC) Division, Newport, RI, has completed this assessment for three sites: the preferred ...
A hydrophone assembly for deployment on the bottom of a body of water is provided wherein a plurality of hydrophones are mounted in a spaced apart relationship about the circumference of a housing which is designed to hold signal processing electronics. Each hydrophone is constructed to detect a range of frequencies within a defined receive angle that extends outward from the circumference of the housing. A resonance absorbing material is ...
A data acquisition system receives an analog input signal comprising a plurality of octavely-nested components including a base octave and a selected number of higher-level octaves, and transmits digital data words representative of each component over a channel. The data acquisition system includes a data transmission system and an interface. The data transmission controller generates transmission strobes signals defining a series of octave transmission cycles each associated with one of ...
A multiplexing node is associated with each analog sensor of a line array. Each multiplexing node has an amplifier/filter section coupled to its associated analog sensor for amplifying and shaping a signal generated by the sensor. An AID converter then samples the signal. A receiver is coupled to a previous one of the multiplexing nodes for receiving scrambled data and clock information in serial fashion from the previous node. A ...
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