第40卷2023年第s1期上海航天(中英文)AEROSPACESHANGHAI(CHINESE&ENGLISH)PMF⁃FFT并行捕获扇贝损失补偿方法分析刘庆,张锦,李忞詝,彭舒文,周里(上海航天电子技术研究所,上海201109)摘要:在长征四号运载火箭飞行过程中,全球导航卫星系统(GNSS)接收机与卫星的相对运动使得载波存在较大的多普勒频移,必须尽快完成信号捕获。采用PMF-FFT(部分匹配滤波和快速傅里叶变换)方法可以快速捕获GNSS扩频信号,采用频域并行捕获可进一步扩展单次载波多普勒频移的搜索范围,然而PMF-FFT在并行捕获中的扇贝损失降低了捕获性能,需要进行补偿。分析了PMF-FFT捕获中扇贝损失的产生机理,并讨论了单通道及通道间扇贝损失的补偿方法。结果表明:给出的补偿方法可改善扇贝损失,为GNSS接收机快速完成卫星信号捕获奠定了基础,适用于运载火箭等高动态环境下的导航接收机设计,对采用PMF-FFT捕获的扩频类接收机、应答机设计也有一定的工程实用价值。关键词:PMF-FFT;并行捕获;扇贝损失;补偿;高动态;GNSS中图分类号:TN967.1文献标志码:ADOI:10.19328/j.cnki.2096⁃8655.2023.s1.014AnalysisofCompensationMethodforScallopingLossinParallelAcquisitionBasedonPMF-FFTLIUQing,ZHANGJin,LIMinzhu,PENGShuwen,ZHOULi(ShanghaiAerospaceElectronicTechnologyInstitute,Shanghai201109,China)Abstract:DuringtheflightofCZ-4launchvehicles,largeDoppleroffsetsexistbetweenthelocalsignalinGNSS(GlobalNavigationSatelliteSystem)receiversandtheincomingsignalfromthesatellites.Therefore,itisnecessarytoacquirethereceivedsignalontime.PMF-FFT(PartialMatchedFiltercombinedwithFastFourierTransform)canacceleratetheacquisitionofhighdynamicspread-spectrumsignals.Furthermore,parallelacquisitioninthefrequencydomaincoversawiderDoppleroffsetrangeinasinglesearchprocess.However,scallopinglossinthePMF-FFTmethodreducestheacquisitionperformanceandneedstobecompensated.Themechanismofscallopinglosswasanalyzed,andthecompensationmethodsinasinglechannelandbetweenchannelswerediscussed.Resultsshowthatthesolutioncanimprovethescallopingloss,whichlaysthefoundationforGNSSreceiverstocompletethesignalacquisitionquickly.ThemethodissuitableforthedesignofGNSSreceiversinhighlydynamicenvironmentssuchas...