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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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