水下目标航行参数遥测技术分析

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1、ABSTRACTABSTRACTNavigationparametertelemetrytechniqueofunderwaterobjectisakerneltechniquefortransmittingmessagebetweensystemslikeunderwatervehiclesandcable-freeunderwaterrobots.Thisthesisisengagedinnavigationparametertelemetrytechniqueusedfortestinghighspeed

2、objectinshallowwaterwithmulti-pathconditionbyanalyzingthecharacteristicofunderwatersoundpath.ItconcernsinDopplercompensationandunderwatertelemetrysignalmod-demodtechniqueresearchesbytheoryanalyzeandsimulation.Thenthesignalprocessingprototypewasformedandhadbe

3、entestedonlake.Inthisthesis,weconcentratedonthetransmitmodelofsignalpathinshallowwater.Themodelwasestablishedbasedonsoundlinetheorybyanalyzingthemultipathcharacteroftheunderwateracousticsignalpath.WesimulatedthetransmitcharacterbyMatlab,studiedthefrequencyse

4、lectcharacterandthevariationinSMRwiththedistance,andanalyzedthetransmittrackofsoundinfourseasons.TheDopplercompensationtechniqueforhighspeedobjectisresearchedandaneffectivecompensationschemewasproposed.Thatistomatchfilteringthelinearmodulatesyncsignal,realiz

5、etheDopplerfrequencyshiftestimationbasedonframelengthmeasurement,andthenthelinearinterpolationisusedfortheDopplercompensation.Ithadbeendemonstratedbysimulationandtestonlakethatthefrequencyshiftcompensationprecisionisin20Hz.TheaffectionofDopplerfrequencyshift

6、isloweredeffectively.ThemodulationmethodssuchasOFDM,frequencyjumping,MFSK,timedelayshiftcodinghadbeenstudiedandsimulatedforcomparingtheirshortageandadvantage.Accordingtotheapplicationtoprefertheunderwatertelemetrysignalsystemsuitableforusingtoantimultipathan

7、dmeettheneedoftelemetry.Aimedatthegeneraldesignrequirementsofthesystem,thesignalprocessingplatformwasconstructedbyusingHighspeedfloatpointDSPchipADSP-TS201asthemainprocessorofsignalprocessinghardware,andtheserialCycloneIIFPGAasthemaincontroller.Theprocessing

8、algorithmsofunderwateracoustictelemetrysignalwereprogrammedbyusingbothcombiningtheClanguageandassemblelanguage.Afteralltheseworks,theunderwateracoustictelemetrytestwasconductedonlake.IIABSTRACTT