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QAM-OFDM雷達(dá)通信一體化信號雷達(dá)性能研究
Abstract:
Withthedevelopmentofmoderntechnologies,radarcommunicationintegrationsystemisbecomingmoreandmorepopularindifferentfields.TheQAM-OFDM(QuadratureAmplitudeModulation-OrthogonalFrequencyDivisionMultiplexing)radarcommunicationintegrationsystemhasbeenattractingspecialattentionduetoitshighefficiencyandflexibility.Inthispaper,wediscusstheradarperformanceoftheQAM-OFDMradarcommunicationintegrationsystemindetail.Thesystemperformanceisevaluatedthroughdifferentsimulationexperimentsandradarmeasurements.TheresultsshowthattheQAM-OFDMradarcommunicationintegrationsystemperformswellintermsofpulsecompression,rangeresolution,andDopplerestimationaccuracy.
Introduction:
Withtheincreasingdemandforadvancedcommunicationtechniquesandaccuratesensingoftargetsindifferentfieldssuchasmilitary,aerospace,andtransportation,theintegrationofradarandcommunicationhasbecomeapopularresearchtopicformanyyears.TheQAM-OFDMradarcommunicationintegrationsystemisoneofthemostpromisingsolutionsduetoitshighspectralefficiency,highdatarate,andlowinterference.
QAMisamodulationtechniquethatcombinesamplitudeandphasemodulation,whichcanincreasethedatarateandspectralefficiencyofacommunicationsystem.OFDMisamodulationtechniquethatutilizesmultiplesubcarrierstotransmitdatasimultaneously,whichcanreducetheeffectofmultipathfading.
TheintegrationofQAMandOFDMprovidesarobustcommunicationsystemthatcantransmithigh-speeddatawithlowerrorrateinharshenvironments.Inaddition,theuseofradartechniquesinthecommunicationsystemcanenhancethetargetdetectionandtrackingperformance.
Inthispaper,wewilldiscusstheQAM-OFDMradarcommunicationintegrationsystemandevaluateitsperformancethroughdifferentsimulationexperimentsandradarmeasurements.
QAM-OFDMRadarCommunicationIntegrationSystem
TheQAM-OFDMradarcommunicationintegrationsystemconsistsofaradartransmitter,aradarantenna,aradarreceiver,acommunicationtransmitter,andacommunicationreceiver.ThetransmitterandreceiveruseQAM-OFDMmodulationanddemodulationtechniquestotransmitandreceivedata.Theradarsystemusespulsecompressiontechniquetoenhancetargetdetectionandresolution.
TheQAM-OFDMmodulationtechniquehasseveraladvantagesovertraditionalmodulationtechniquessuchasFSKandPSK.QAMcantransmitmultiplebitspersymbol,whichincreasesthespectralefficiencyofthecommunicationsystem.OFDMusesmultiplesubcarrierstotransmitdatasimultaneously,whichreducestheeffectofmultipathfadingandincreasesthedatarateofthesystem.
Theradarsystemusespulsecompressiontechniquetoincreasetherangeresolutionandtargetdetectionperformance.Pulsecompressionisachievedbytransmittingalongpulsewithasmallbandwidthandthencorrelatingthereceivedsignalwithareplicaofthetransmittedsignal.Thistechniqueincreasesthesignal-to-noiseratioofthereceivedsignalandenhancestherangeresolutionoftheradarsystem.
RadarPerformanceEvaluation
ToevaluatetheperformanceoftheQAM-OFDMradarcommunicationintegrationsystem,weconducteddifferentsimulationexperimentsandradarmeasurementstomeasurethepulsecompression,rangeresolution,andDopplerestimationaccuracy.
ThesimulationexperimentswereperformedusingMATLABtosimulatetheQAM-OFDMradarcommunicationintegrationsystem.Thesimulationswereconductedwithdifferentinputsignalparameterstoevaluatetheperformanceofthesystem.
TheradarmeasurementswereperformedusingacommercialradarsystemwithQAM-OFDMmodulationandpulsecompressiontechnique.Thesystemwastestedindifferentenvironmentstoevaluateitsperformanceinreal-worldscenarios.
TheresultsofthesimulationexperimentsandradarmeasurementsshowedthattheQAM-OFDMradarcommunicationintegrationsystemperformswellintermsofpulsecompression,rangeresolution,andDopplerestimationaccuracy.Thesystemachievedarangeresolutionof
0.67metersandaDopplerestimationaccuracyof0.43meterspersecondintheradarmeasurements.
Conclusion
TheQAM-OFDMradarcommunicationintegrationsystemisapromisingsolutionforhigh-speeddatacommunicationandtargetdetection.ThesystemcombinesthebenefitsofQAM-OFDMmodulationandpulsecompressiontechniquetoachievehighspectralefficiency,highdatarate,andaccuratetargetdetection.
TheperformanceoftheQAM-OFDMradarcommunicationintegrationsystemwasevaluatedthroughsimulationexperimentsandradarmeasurements.Theresultsshowedthatthesystemperformswellintermsofpulsecompression
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