the estimation of ship velocity from a sar image：船的速度从sar图像的估计

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1、TheEstimationofShipVelocityfromaSARImageJamesK.E.Tunaley,RadarApplicationsandSpaceTechnologySectionDRDCOttawaOBJECTIVESShipvelocityvectorisimportantforoceansurveillance:TrackingrequiresIDmaintenanceDenseshippingenvironmentsStudythefeasibilityofextractingshipvelocityvector(headingandspe

2、ed)fromSARimagery:*Cross-rangedisplacement*KelvinwakeOtherwakesOceanmodels–internalwavespeed(maximum)Codesoftwaretool(GayanAbeysundara)CROSS-RANGEDISPLACEMENTSeasat:noteoffsetInternalwavewake?Unsteadywake?EXAMPLEOFTURBULENTWAKETurbulentwakeinRadarsatimageRadarsatimage“CanmarPride”EXAMPL

3、EOFKELVINWAKEShipTransverseWavesTurbulentWakeINTERNALWAKE(ERS)POTENTIALDIFFICULTIESNotalwaysawake:Turbulentwakeusuallypresentforlargeships:uptoandincludingSS4InternalwavescommoninlittoralareaswhenSS<3AmbientseaVarietyofwaketypesTurbulentSteadyInternalKelvinUnsteadysurfaceandinternalwake

4、sSomewakearmsmissingNaturalinternalwavesRADONTRANSFORMMapslinesinspatialdomaintopointsinRadonspaceShouldbeprecededbyhighpassfilterandpossiblybyaWienerpost-filter(Seasat)EXAMPLEOFRADONTRANSFORMWAKEARMEXTRACTIONLocatewakeusing4regionsExtractarmsfromlargerareaWAKECLASSIFICATIONAngleofwakeS

5、hapeofcrests;presenceoftransversewavesWidthandbrightnessoflines(importantforturbulentwake)OTHERTECHNIQUES:OCEANMODELSInternalwavewakeopeningangleKELVINTRANSVERSEWAVESShipspeedequalsphasespeedDispersionrelationPERFORMANCEDatafromtheCanadianCoastGuardReportingpointsinGulfofSt.LawrenceName

6、TypeLength(m)Servicespeed(km/hr)ActualSpeed(km/hr)CanmarPrideContainerCarrier2443941.81.5Hope1BulkCarrier1882820.40.7TuridKnutsenChemicalTanker1632518.90.7TABLE1SHIPPARAMETERSWAKE-DERIVEDSPEEDS(TURBULENT)NameLength(m)Speed(km/hr)CanmarPride200-260(244)36.5-41.7(41.8)Hope1172-240(188)

7、23.2-27.5(20.4)TuridKnutsen200-260(163)22.6-28.0(18.9)TABLE2IMAGEDERIVEDLENGTHSANDSPEEDSWAKE-DERIVEDSPEED(KELVIN)CanmarPridespeed:Wavelengthabout78mSpeedabout40km/hr(11m/s,22knots)SUPPORTINGACTIVITIESWakesimulationsKelvinInternalTurbulentUnsteady:shipmotion,reflections,propelle