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dc.contributor.authorLai, Zhiguo
dc.date.accessioned2016-03-29T01:24:13Z
dc.date.available2016-03-29T01:24:13Z
dc.date.issued2002-08
dc.identifier.urihttp://hdl.handle.net/11122/6433
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2002en_US
dc.description.abstractA model of fish distribution in time and space and a single-beam sonar model are presented. Simulated sonar data are obtained and analyzed using the echo-counting method to determine the estimated number of fish. The results show that (1) when the fish rate is less than 1 fish/s, the error is within plus minus 15% and fish are overcounted more often than undercounted, (2) this method underestimates the number of fish by 57% of the actual number of fish for a fish rate of 5 fish/s, (3) fish counts are dominated by the noise if the threshold is lower than the noise level, (4) by varying the ping rate, the error could be as much as 72% for a fish rate of 10 fish/s and a ping rate of 10 pings/s, (5) by varying the pulse width, the error could be as much as 80% for a fish rate of 10 fish/s and a pulse width of 1.0 ms.en_US
dc.language.isoen_USen_US
dc.titleUncertainty in fish counting using an echo-counting technique as applied to data from a single-beam sonaren_US
dc.typeThesisen_US
refterms.dateFOA2020-01-25T02:11:37Z


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