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1、IEEETRANSACTIONSOKXYTENNASANDPROPAGATION,VOL.M-21,NO.5,SEPTEMBER1973649.TwoFrequencyRadarInterferometryAppliedtotheMeasurementofOceanWaveHeightDAVIDE.WEISSMANAbstract-Atechniqueisdevelopedformeasuringthermswavemit,sandreceivestwocontinuousmonochromaticsignalsheightaveragedoveranare
2、aoftheseathatismuchgreaterthansimult,aneously.Signalprocessingat.t,hereceiverrequiresanyhorizontalscaleofthesurfacewaves.Themethodinvolvesathecomput,at,ionofacorrelationfunctionwhichisshownnadirlookingradarwhichtransmitsandreceivestwomonochromaticsignalssimultaneously.Signalprocess
3、ingatthereceiverinvolvestodependonlyonthest,at,isticalrmssurfaceelevationofthecomputationofthecorrelationbetweenthetworeturningsignalsspecularpointsandnot.onthetemporalorspatialfre-asafunctionoftheirvariablefrequencyseparation.Thecrossquencyspectrum(ort.heequivalenttemporalorspat,i
4、alcorrelationbetweentheamplitudeandphasefunctionsofthein-correlat-ionfunctions)ofthewaveheightorslope.Underdividualreturningcarriersdependsonthedistributionofdiscreteconditionswhicharet.ypica.1foramicrowavesigna.1beingscatterersalongthedirectionofpropagation.Thisinformationcanbeuse
5、dtodeterminethermssurfaceelevation(aboutthemean);normallyincident,andreflectedbyt,hesea,thetwofre-itdoesnotdependonthetemporalorspatialfrequencyspectrumofquencycorrelationfunctionR(Ak)isseentobeequaltothewaveheightorslope.Underconditionswhicharetypicalforathecharacteristicfunct.ion
6、oft,heelevationofthespecularmicrowavesignalbeingnormallyincidentandreflectedbythesea,scatt,eringpointswhichisconsideredtobearandomvari-thetwofrequencycorrelationfunctionR(Ak)isseentobeequaltothecharacteristicfunctionofthesurfaceelevationofspecularpoints.abletha,trepresentsastationa
7、ryrandomprocess.ThisLaboratorymeasurementshavebeenconductedonwinddrivencharacteristicfunct,ionisjust,theFouriertransformofwaves,andthemeasuredcorrelationfunctioncomparesfavorablytheprobabilit,ydensitjyfunctionoftheelevationofspecu-withthetheorydevelopedhere.larpoint,switht,hediffer
8、encefrequency(Ak=kz-kl)ast
