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 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 ...
This invention relates generally to signal interface circuit boards and more particularly to an interface board providing timing signals from a timing source to a super minicomputer (Q Bus compatible). In developing acoustic signatures for underwater vehicles, it is necessary to have accurate range and bearing data to the vehicle and have that data time correlated with the acoustic signals. Present equipment used for these purposes include the Atlantic Undersea ...
A digital calibration circuit provides 1/3 octave center frequencies substantially in the range of 50 Hz-12.5 kHz (25 tones) simultaneously at the output at repeatable levels. The system converts digital data to an analog representation for use in calibrating hydrophones. The calibration circuit is comprised of a clock section, a counting section, a clearing section, a data storage/-transfer section, and a signal conditioning section. The information that is provided to ...
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