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1、第54卷第7期電訊技術(shù)Vo1.54No.72014年7月TelecommunicationEngineeringJu1.2014doi:10.3969/j.issn.1001-893x.2014.07.008引用格式:甘義明,周艷玲.GNSS信號(hào)多門(mén)延遲結(jié)構(gòu)的多徑抑制性能分析[J].電訊技術(shù),2014,54(7):905—909.[GANYi—ming,ZHOUYan—ling.MultipathSuppressionPerformanceAnalysisofMultipleGateDelayStructureforG
2、NSSSignals[J].TelecommunicationEngineering,2014,54(7):905—909.]GNSS信號(hào)多門(mén)延遲結(jié)構(gòu)的多徑抑制性能分析甘義明,周艷玲料(湖北大學(xué)計(jì)算機(jī)與信息工程學(xué)院,武漢430062)摘要:多徑干擾不具備空間相關(guān)性,難以通過(guò)差分方法消除,是影響全球?qū)Ш叫l(wèi)星系統(tǒng)定位精度的關(guān)鍵因素之一。從接收機(jī)處理的導(dǎo)航信號(hào)受前端帶寬限制以及近距離多徑干擾更需抑制兩個(gè)角度出發(fā),提出了一種基于多門(mén)延遲(MGD)結(jié)構(gòu)的多徑干擾抑制方法,推導(dǎo)了帶寬受限時(shí)MGD結(jié)構(gòu)的多徑誤差的數(shù)學(xué)表達(dá)式,以加權(quán)和
3、非加權(quán)多徑誤差包絡(luò)面積最小作為目標(biāo)函數(shù),優(yōu)化了該結(jié)構(gòu)中早遲門(mén)系數(shù),并以典型導(dǎo)航信號(hào)SinBOC(10,5)為例來(lái)說(shuō)明該方法的性能。結(jié)果表明:對(duì)于SinBOC(10,5),該方法多徑誤差包絡(luò)面積小于高分辨率相關(guān)器(HRC)方法至少15%;當(dāng)前端帶寬較大時(shí),該方法對(duì)于較小和中等延遲的多徑信號(hào)的抑制能力優(yōu)于HRC方法。關(guān)鍵詞:全球?qū)Ш叫l(wèi)星系統(tǒng);多徑干擾;多門(mén)延遲;高分辨率相關(guān)器中圖分類(lèi)號(hào):TN961文獻(xiàn)標(biāo)志碼:A文章編號(hào):1001—893X(2014)07—0905—05MultipathSuppressionPerform
4、anceAnalysisofMultipleGateDelayStructureforGNSSSignalsGANYi-ming,ZHOUYan—ling(SchoolofComputerScienceandInformationEngineering,HubeiUniversity,Wuhan430062,China)Abstract:Muhipathinterferenceswhichagedificulttobeeliminatedthroughthedifferentialmethodbe—causetheya
5、renotinterrelatedinspace,affectsthepositioningaccuracyofglobalnavigationsatellitesys—tems(GNSS).Thenavigationsignalsinthereceiverageaffectedbythefront—endbandwidth,andtheclosemuhipathinterferencesuppressionhasmorepracticalsignificance.Fromthetwoaspectsamuhipathi
6、nter-ferencesuppressionmethodbasedonmultiplegatedelay(MGD)isproposedinthispaper.ThemuhipatherrormathematicalexpressionsoftheMGDmethodunderlimitedbandwidtharederived,theearly—lategatecoeficientsoftheMGDareoptimizedbyminimizingtheareasclosedbytheweightedandnon-wei
7、ghtedmuhipatherorenvelopes,andthetypicalnavigationsignalSinBOC(10,5)ischosenasanexampletoil—lustratetheperformanceofthemethod.TheresultsshowthatforSinBOC(10,5)theareaclosedbythemuhipatherrorenvelopesofMGDmethodislessthanthatofthehigh—resolutioncorrelator(HRC)met
8、hodatleast15%,andwhenthefront-endbandwidthislarge,forthesmallandmediumdelayedmuhipathsig—nalthemuhipatheroroftheMGDmethodislessthanthatofHRCmethod.Keywords:globalnavi