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1、ABSTRACTABSTRACTTheradiaternoisemeasuringisaefficientapproachtoevaluatethequietlevelof
underwatertargetsinthewateanddeveloptheresearchonreducingtheradiater
noise.However,withthedevelopmentofrelatedtechnology,theradiatednoiseofsome
underwatertargetsis
2、gettinglowerandlower,soitismoredifficulttomeasurethe
radiaternoiseexactlynow.Fortherequestofmeasuringlowernoiseofquietunderwater
targets,thisthesismakethemethodofmeasuringandanalysingofnearfieldtarget's
noiseastheresearchsubject,focusonthewayofmeasur
3、inglowernoiseofunderwater
targetsandthemethodofsignalprocessing,thengetameasuringsystemtovalidatethe
measuringandprocessingmethodabove.Thisthesisintroducethebackgroundofmeasuringlownoiseofunderwatertargets
firstly,thensummarizethehistoryandcurrentsit
4、uationofmeasuringradiatednoise,and
explainthemeasuringconditionsofnearfieldandfarfieldinnoisemeasuring.Getting
severalmethodsofmeasuringlownoiseofunderwatertargetsthoughthetheoryof
measuringradiatdnoiseandpassivesonarequation.Thissubjectgetsasetoflow
5、noisemeasuringsystembaseonverticalline
array,gettingalongerdistanceandabetterresultofmeasuringthroughimprovingSNR
accordingtothedirectivityofthearray,buildingabuoydippingtypemeasuringsystem
baseontheprecisepositioningofthebuoy,lowerTLfromshorteningth
6、emeasur
distance,andachievethepurposeofmeasuringthenoiseofquietunderwatertargets.
Studingonthemethodofsignalprocessing,focusonthebeamformingmethodof
verticallinearrayinnearfield,gettingthedirectionanddistanceofthetargetstothe
measuringarrayaccordings
7、ynchronizationmeasuring,formingthebeamthatpointsto
thedirectionofthetargetwithbeamformingtechnology.Reducetheside-petalaccording
tothebeam-controltechnology,optimizethedirectioncharacteristicofthemeasuring
array.Aftersimulatingthetheorywithcomputer,c
8、ompilingakindofsoftwaretoprocess
thesignalofverticallinearrayandthenoiseparameters.Forvalidatingthemeasuringmethodandsignalprocessingmethodinthis
thesis,unfoldstaticstateanddynamicexperimentationsonthelake.Mearsuringthe
signaloftheanalogsoundsourcean
