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1、偵察聲納接收機(jī)的接收信號(hào)仿真研究摘要本文針對(duì)聲納設(shè)備接收機(jī),通過對(duì)海洋聲信道的建模仿真,而達(dá)到接收機(jī)輸入端接收到的信號(hào)和噪聲的模擬,從而對(duì)聲納接收機(jī)進(jìn)行半實(shí)物仿真測(cè)試。本文研究結(jié)果盡可能的反應(yīng)出水聲信號(hào)在海洋中傳播的物理現(xiàn)象,以用于海上試驗(yàn)前完成接收機(jī)性能的測(cè)試。論文的主要工作是從理論和計(jì)算仿真兩方面探討,在分析信號(hào)形式、海洋聲信道原理、海洋噪聲環(huán)境基礎(chǔ)上,給出接收機(jī)輸入端收到的信號(hào)及噪聲模擬,同時(shí)采集接收機(jī)輸出的信號(hào)“有”、“無”的判別,給出接收機(jī)實(shí)際的檢測(cè)概率和虛警概率。根據(jù)信號(hào)仿真需求,對(duì)水聲信道基本特性進(jìn)行了分
2、析。介紹了海洋環(huán)境中聲速、聲場(chǎng)環(huán)境、傳播損失、環(huán)境噪聲、混響等海洋聲信道參數(shù),利用經(jīng)典理論對(duì)海洋聲信道基本特性參數(shù)進(jìn)行分析,給出了相關(guān)的計(jì)算公式或經(jīng)驗(yàn)取值。在水聲信道基本特性分析基礎(chǔ)上,進(jìn)行水聲信道建模仿真。首先進(jìn)行了水聲信道模型基本理論——射線聲學(xué)理論的分析,再對(duì)海洋聲信道環(huán)境進(jìn)行綜合描述,最后通過模型參數(shù)假設(shè),選取了本征聲線,給出了簡(jiǎn)化的水聲信道模型,該模型盡可能的模擬了海洋環(huán)境的物理現(xiàn)象。利用水聲信道模型,實(shí)現(xiàn)聲納接收的信號(hào)仿真及接收機(jī)測(cè)試。首先分析了接收機(jī)測(cè)試原理,從需求上建立了目標(biāo)聲源、信道及噪聲的仿真模塊,
3、從而建立起了接收機(jī)的測(cè)試框架。針對(duì)某具體接收機(jī),模擬出聲源信號(hào)經(jīng)過水聲信道后的輸出波形,并提供聲納接收機(jī)測(cè)試,得出了聲納接收機(jī)的檢測(cè)概率和虛警概率。關(guān)鍵詞:聲納接收機(jī);水聲信道建模;檢測(cè)概率;虛警概率測(cè)試哈爾濱工程大學(xué)碩士學(xué)位論文偵察聲納接收機(jī)的接收信號(hào)仿真研究ABSTRACTThispaperaimedatsonarreceiver,thereceiver’Ssignalandnoisearesimulatedbyunderwateracousticchannelmodel,andthesonarreceiver’S
4、hardware—in—the—loopsimulationistested.Thestudyresultofthispaperisreactedtherealphysicalpropertiesofseaenvironmentasfaraspossible,andcantestofreceiver’Sperformancebeforeseatrails.Withtheprincipleanalysisandcomputationalsimulation,thisissuebasedonthesignalform,oc
5、eansoundsignalchannelprincipleandmarineenvironmentnoise,thesimulationmethodofreceiverinputsignalandnoiseisputforward.Atthesametime,putforwardtheactualreceiver’Sdetectionprobabilityandfalse-alarmprobabilitybysampledthereceiver’Sompmsignal.Accordingtothesimulation
6、needs,thispaperanalyzesthebasiccharacteristicsofunderwateracousticchannel.Andspeedofsoundintheoceanenvironment,soundfieldenvironment,propagationloss,ambientnoise,reverberation,andotheroceanacousticchannelparametersareintroduced.Byusingclassicaltheory,thispaperan
7、alyzersthebasiccharacteristicsoftheoceanacousticchannelparametersareanalysised,andformulaorexperienceofvalueisgi-ven.Onthebaseofthebasiccharacteristicsanalyzeofunderwateracousticchannel,theunderwateracousticchannelmodelingissimulated.Inthispaper,analysisoftheund
8、erwateracousticchannelmodelbasictheory一”rayacousticstheory”atfirst.thencomprehensivedescriptmarinesoundchannelenvironment,andatlastgiventhesimplifiedunderwateracousti