Abstract: ToimprovetheimplementationflexibilityofGNSSweaksignalacquisitioninthehighdynamicenvironments,anacquisitionalgorithmincludingtwostagefastFouriertransform(FFT)wasdeveloped.Inthefirststage,theshortcoherentintegrationtimewasemployedtodividetheDopplerfrequencyrangeintoseveralsub-rangescalledcoarseDopplerfrequencybins.Inthesecondstage,thefineDopplerfrequencysearchingwascompletedbasedontheoutputofthefirststageFFT.ThepresentedmethodcanreducethenumberofFFTpointsandtheimplementationcomplexity.Besides,thepipelineprocessingwasusedinthefirststageFFT,whichcouldincreasetheefficiencyofhardwaresource.ThesimulationresultsshowthatthepresentedmethodcanacquireweakGNSSsignalscorrectlyinhighdynamicscenarios.

Key words: WeakGNSSsignal, Navigationsignalacquisition, FastFouriertransform, Dopplerfrequency, Globalnavigationsatellitesystem