魚(yú)群聲散射模型及其仿真研究.pdf

1、Y1436826分類(lèi)號(hào)：——UDC：工學(xué)碩士學(xué)位論文密級(jí)：編號(hào)：魚(yú)群聲散射模型及其仿真研究碩士研究生：指導(dǎo)教師：學(xué)位級(jí)別：學(xué)科、專(zhuān)業(yè)：所在單位：論文提交日期：論文答辯日期：學(xué)位授予單位：張波李海森教授工學(xué)碩士通信與信息系統(tǒng)水聲工程學(xué)院2009年2月2009年3月哈爾濱工程大學(xué)哈爾濱T：祥人學(xué)碩學(xué)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