Gerald F. Denny

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Underwater gliders are buoyancy-driven devices; they alternately reduce and expand displaced volume to dive and climb through the ocean. Gliders carry wings and control their pitch attitude to effectuate a horizontal speed component through the ocean. They turn by rolling their wings or by use of a rudder. Buoyancy control, coupled with hydrodynamic lift is(More)
Broadband acoustic echoes were collected on free-swimming alewives Alosa psuedoharungus, rainbow smelt Osmerus mordax, and bloaters Coregonus hoyi. Concurrent midwater trawls were used to determine species composition. A genetic neural network was trained on broadband echoes from each species to an overall correct classification rate of 91%. Tests of the(More)
This paper describes the first classification results with the first broadband sonar fish identification system prototype that was built by Scientific Fishery Systems, Inc. Two species of fish and the bottom were used in a set of classifier experiments using two different sets of features -echo shape and echo spectra. The author would describe where the(More)
Some of the differences between broadband and narrowband sonar systems applied in fisheries hydroacoustics are examined. Following a brief discussion of the advantages and disadvantages of broadband sonar, three different aspects of narrowband and broadband sonar systems are compared: detection, Doppler processing, and split-beam localization. Summaries are(More)
This paper proposes a viable solution to the port security swimmer detection/identification problem using a broadband active sonar system with TCP/IP interface. Broadband active sonar, characterized by compressed pulse and wide-ranging spectral features, offers the ability to locate an underwater target accurately and classify it as a swimmer (diver) apart(More)
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