angeo-18-1242-2000

angeo-18-1242-2000

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時間:2019-06-24

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1、Ann.Geophysicae18,1242±124732000)óEGS±Springer-Verlag2000Groundcluttercancellationinincoherentradars:solutionsforEISCATSvalbardradar123T.Turunen,J.Markkanen,A.P.vanEyken1EISCATScienti?cAssociation,SE-98123Kiruna,Sweden2EISCATScienti?cAssociation,FIN-99600Sodankylaè,Finl

2、and3EISCATScienti?cAssociation,N-9171Longyearbyen,NorwayReceived:24January2000/Revised:5July2000/Accepted:6July2000Abstract.Incoherentscatterradarsmeasureionospherepowerfulandsensitivesystemsmustbedeployedtoparametersusingmodi?edThomsonscatterfromfreeensureuseablereturn

3、s.Incoherentscatterradarstypi-electronsinthetarget3seee.g.Hagfors,1997).ThecallyuseVHFandUHFfrequenciesthroughseveralintegratedcrosssectionoftheionosphericscatterersisMFinstrumentsalsoexist.extremelysmallandthemeasurementscaneasilybeToobtainadequatespatialandspectralres

4、olution,disturbedbysignalsreturnedbyunwantedtargets.on-oamplitudemodulation,binaryphasemodulation,Groundcluttersignals,enteringviatheantennasidefrequencymodulation,andcombinationsofthesearelobes,canrendermeasurementsatthenearesttargetusedinthetransmittedpulses.Targetban

5、dwidthsvaryrangestotallyimpossible.TheEISCATSvalbardRadarfromhundredsofHertztosometensofkiloHertzand3ESR),whichstartedmeasurementsin1996,suersfrommodulationbandwidthsfromaboutonekiloHertztoseveregroundclutterandtheionospherecannotbehundredsofkiloHertz.Together,thesedict

6、atethemeasuredinanysimplemanneratrangeslessthanaboutreceivingbandwidth,noisebandwidthandsampling120±150km,dependingonthemodulationemployed.Ifintervalsrequired.Insomespecialapplicationsmuchthetargetandcluttersignalshavedierent,andclearlyhigherbandwidthsmustbeaccommodated

7、.Receptionidenti?able,propertiesthen,inprinciple,thereareanddatasamplingusuallystart300±500microsecondsalwayswaystoeliminatetheclutter.Inincoherentaftertheendoftransmittedpulse,forthosemodulationsscattermeasurements,dierencesinthecoherencetimestobeusedatthelowestrangeso

8、fthetarget.Theupperofthewantedandunwantedsignalscanbeusedforlimitofthepossiblereceptionwindowissetbythepointcl

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