魚群聲散射模型及其仿真研究.pdf

1、Y1436826分類號：——UDC：工學碩士學位論文密級：編號：魚群聲散射模型及其仿真研究碩士研究生：指導教師：學位級別：學科、專業(yè)：所在單位：論文提交日期：論文答辯日期：學位授予單位：張波李海森教授工學碩士通信與信息系統(tǒng)水聲工程學院2009年2月2009年3月哈爾濱工程大學哈爾濱T：祥人學碩學位論文ABSTRACTTheunderwateracoustictechnologyisthemostefficientapproachused

2、infisheryproductionandsurveyGenerallytherearetwomainkindsofmethodsintheacousticfisheryapplication，whicharemeasurementandmodelanalysisTheacousticscatteringmodeloffishschoolisthebaseofacousticfisheryapplicationSotohaveadee

3、perknowledgeaboutfishschoolscatteringproblemandprovideatheoreticalsupportforthefishfinderdevelopment，someeffortsaremadeasfollows：ThesinglefishmodelisthebaseoffishschoolacousticscatteringmodelFirstlytwosinglefishacousticm

4、odelsaregiventodescribethescatteringmechanismoffishWetreatfishasthecombinationofbodyandswimbladderInlowfrequencyband，aspheremodelisusedforswimbladderwhichisthemainscatteringcontributorinthissituationWhileinhighfrequencyb

5、and，boththebodyandswimbladderaremodeledbyKirchhoffray—approximationmodel，whichtakesintoconsiderationtheactualshapeoffishBasedontheabovediscussion，allacousticscatteringmodeloffishschoolinlowfrequencyisproposedwithinclusio

6、nofthemultiplescatteringandcouplingeffectbetweeneachfishinfishsch001TheechosimulationoffishschoolisnecessarytobedevelopedbecauseoftheneedtoimprovetheaccuracyoffishabundanceestimationandfishclassificationalgorithmAfterthe

7、detailedresearchoffishmodelaswellasthefishschoolscatteringmodel，anexactsimulationoffishschoolechoisdonetogeneratetheechoesindifferentfishschoolconditionsThestatisticalmodelisusedasatooltoinvestigatethefishschoolechochara

8、cteristicSomepopularstatisticalmodelsandapproachesareappliedtoanalyzethesimulatedfishschoolecho，anditisconcludedthatGammaandKdistributionfittheechopeakandenveloperespectivelyThefishtargetstrength(TS)estimationisvitaltoth