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dc.contributor.authorFoote, Kenneth G.  Concept link
dc.contributor.authorKnudsen, Hans Petter  Concept link
dc.contributor.authorKorneliussen, Rolf J.  Concept link
dc.contributor.authorNordbø, Per Erik  Concept link
dc.contributor.authorRøang, Kjell  Concept link
dc.date.accessioned2012-12-19T16:37:47Z
dc.date.available2012-12-19T16:37:47Z
dc.date.issued1991-07
dc.identifier.citationJournal of the Acoustical Society of America 90 (1991): 37-47en_US
dc.identifier.urihttps://hdl.handle.net/1912/5646
dc.descriptionAuthor Posting. © Acoustical Society of America, 1991. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 90 (1991): 37-47, doi:10.1121/1.401261.en_US
dc.description.abstractEcho sounding is a powerful and widely used technique for remote sensing of the marine environment. In order to enhance the power of the echo sounder, a postprocessing system has been designed and realized in standard software that is essentially machine independent. This has been done by adhering to the following international standards: UNIX operating system, C programming language, X Window Systems, Structured‐Query Language (SQL) for communication with a relational database, and Transport Control Protocol/Internet Protocol (TCP/IP). Preprocessed data are transferred from the echo sounder to the postprocessing system by means of a local‐area network (LAN), namely Ethernet. Development of the postprocessing system, for analysis of such diverse scatterers as plankton, pelagic, and bottom fish, and the bottom itself, is documented in the following way. The history of echo integration is summarized. User requirements for the new system are listed. Reasons are given for the choice of the particular computing environment, including both hardware, software, and external communications. The system design, consisting of data flow and graphical user interfaces, is described. Implementation of the system is defined through integration techniques and a discussion of performance issues. Operating procedures and the first field trials of the system are described. Several features characteristic of and perhaps unique to the postprocessing system are, for example: (1) user definition of arbitrarily shaped integration regions, including non‐constant‐depth intervals, by means of interactive graphics; (2) preprocessor error correction, e.g., adjustment of the noise threshold or redefinition of the detected bottom; (3) use of several color map techniques in order to extract such information as signal strength and shape; and (4) the scheme of interconnections of graphical user interfaces, database, and data files. This work does not introduce a set of computer instructions. It does describe a design philosophy and method of realization that may have broader applications in acoustics than that ostensibly concerned only with the quantitative estimation of fish abundance.en_US
dc.format.mimetypeapplication/pdf
dc.language.isoen_USen_US
dc.publisherAcoustical Society of Americaen_US
dc.relation.urihttps://doi.org/10.1121/1.401261
dc.subjectData processingen_US
dc.subjectRemote sensingen_US
dc.subjectMarine surveysen_US
dc.subjectAcoustic equipmenten_US
dc.subjectEchoesen_US
dc.subjectFishesen_US
dc.subjectField testsen_US
dc.titlePostprocessing system for echo sounder dataen_US
dc.typeArticleen_US
dc.identifier.doi10.1121/1.401261


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