single beam high resolution pulsetopulse coherent doppler profiler

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1、SingleBeam,HighResolutionPulse-to-PulseCoherentDopplerProfilerL.Zedell,R.Cabrera2,A.Lohrmann2,A.Hay'MemorialUniversityofNewfoundland,St.John's,NFSontek,SanDiego,CAAbstruct-Wereportonthedevelopmentof2SYSTEMDESCRIPTIONasinglebeam,1.7MHzcoherentDopplersonar.ThesystemisPC-cont

2、rolled,usingaDigitalSignalTheDopbeamsystemisasingleacousticbeamProcessor(DSP)toacquireandextracttheveloc-unitdesignedtoprovideamaximumdegreeofflex-ityandbackscatteramplitudedata.Resultsfromaibilityinselectingthemodeofoperation.Soft-warecontrolallowstheusertoselectpulsetran

3、s-seriesoftowtankcalibrationtestsdemonstrateanmissionanddatasamplingschemes.Thebasiccom-accuracyintheorderof5mms-',fordataratesponentsoftheDopbeamsystemareidentifiedinof10profiles/secondin75,1.5cmrangebins.Fig.1.TheDopbeamsystemitselfincludesatrans-Wepresentdatashowingthes

4、ystematicdecorre-ducer/amplifierunitwhichishousedinawaterprooflationofbackscattersignalsduetoparticleadvec-caseandacontrollercardcompatiblewithan80x86tion.Exampleobservationsincludevelocityprofilesbasedmicro-computer(PC).TheDopbeamcontrollerspanningthebottomboundarylayerun

5、dershallowcardisequippedwiththree12-bitAnalogtoDigi-waterwaves.talConverters(A/D's)thatcanbesampledbythePC.RatherthanrelyontheA/D'sprovided,we1INTRODUCTIONhaveusedaTMS320C31basedDigitalSignalPro-cessor(DSP)boardequippedwith16-bit(200Ks-l)A/D'stoallowforfasterdataacquisitio

6、nandpro-cessingthanwouldbepossiblewiththePCalone.VelocitymeasurementsoverlengthscalesoforderTheoverallsystemoperationiscontrolledbyaC-1mwithcentimeterresolutionarerequiredinmanylanguageprogramrunningonthePC.TheDSPandareasofbothfieldandlaboratorystudy.ThesmallDopbeamcontrol

7、lerareconfiguredusingsoftwarein-scaleofmeasurementandtheshortrangesinvolvedterfaces;oncedataacquisitionisinitiated,timingisregulatedbytheDopbeamcontrollerinordertopre-createanenvironmentwhereeventhesmallestsen-servephasecoherence.sorcancausesomeflowdisturbanceanddegradedat

8、aquality.Inthissituation,acousticprofilingtechniquesprovideanattractivealternativetopoint