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基于FFT的GPS信号二维大规模并行捕获(英文).docx

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基于FFT的GPS信号二维大规模并行捕获(英文) BasedonFFT,Two-dimensionalLarge-scaleParallelAcquisitionofGPSSignals GPS(GlobalPositioningSystem)isawidelyusedpositioningsystemintransportation,logistics,andnavigationindustries,aswellasinpersonaluse.ToobtainaccuratelocationinformationusingGPS,itisessentialtocaptureGPSsignalswithhighprecision.TheGPSsignalsarecapturedbyaGPSreceiver,whichperformsaparallelsearchacrossallpossiblecodephasestotracktheGPSsatellites.TheparallelsearchisusuallybasedontheFastFourierTransform(FFT)algorithm,whichiscommonlyusedindigitalsignalprocessing. However,thetraditionalFFT-basedGPSsignalcapturemethodshavelimitationsintermsofprocessingpowerandscalability.Thecaptureprocessrequiressignificantcomputationalresources,andthesearchtimemayincreaseexponentiallywiththenumberofGPSsatellitestobesearched.Therefore,itisessentialtodevelopefficientandscalablemethodsforGPSsignalcapturethatcanhandlealargenumberofGPSsatelliteswithinareasonableprocessingtime. Inthispaper,weproposeatwo-dimensionallarge-scaleparallelacquisitionmethodforGPSsignalsbasedonFFT.Theproposedmethodisdesignedtoovercomethelimitationsoftraditionalmethodsbyusingamulti-threadedapproachandparallelizingthecaptureprocessintwodimensions.Ourproposedmethodisatwo-dimensionalparallelsearchthatexploitsthespatialandtemporalcorrelationofGPSsignalacquisition.ThemethodsearchestheGPScodephaseintwodimensions,thetimeandfrequency,andreducesthesearchspacetoimproveacquisitiontime. Theproposedmethodconsistsoftwomainmodules,apre-processingmodule,andaparallelacquisitionmodule.Inthepre-processingmodule,wesynchronizethereceivedGPSsignals,aligntheminfrequency,andnormalizethemtopreparethemfortheparallelacquisitionmodule.Intheparallelacquisitionmodule,ourproposedmethodperformstheFFT-basedparallelsearchacrossallpossiblecodephasesintwodimensions.Theparallelsearchisperformedinparallelthreads,andtheresultiscombinedusingavotingschemetodeterminethecorrectcodephase.Thisapproachhelpsreducetheacquisitiontimebyparallelizingthesearchintwodimensions. Thepe