A 2-step GPS carrier tracking loop for urban vehicle applications-中国期刊网

摘要 Globalpositioningsystem(GPS)forvehicleapplicationsintheurbanareaischallengedbylowsignalintensity.ThecarrierloopbasedonfastFouriertransform(FFT)canobtainahighsignaltonoiseratio(SNR)gainbyincreasingtheobservationtime.However,thisleadstoamajorproblemthattheaccelerationcannotbeignored.TheperformanceoftheFFT-basedloopwilldeclinewiththeaccelerationincreasing.ThispaperdiscussestheeffectofthedynamiconFFTfirst.ThenahighperformancecarriertrackingloopforweakGPSL5signalsisproposed.Itcombinesdiscretechirp-Fouriertransform(DCFT)andthephasefittingmethodtoestimateDopplerfrequencyandDopplerratesimultaneously.First,asequenceofintegrationresultsisusedtoperformDCFTtoestimatecoarseDopplerfrequencyandDopplerrate.Second,thephaseofthesequenceiscalculatedandusedtoperformlinearfitting.Bythephasefittingmethod,thefineDopplerfrequencyandDopplerratecanbeestimated.ThecomputationcostissmallbecausetheintegrationresultsareusedandthephasefittingmethodneedsonlycoarseestimatesofDopplerfrequencyandDopplerrate.ComparedwithFFTandDCFT,theprecisionofthephasefittingmethodisnotlimitedbytheresolution.Thustheproposedloopcangethighprecisionandlowcarriertonoiseratio(C/N0)trackingthreshold.Simulationresultsshowthisloophasagreatimprovementthanconventionalloopsforurbanweak-signalapplications.

1Guolian Yun Qimei Chen Bo Li Xindao Wang. Vision-based Vehicle Tracking and Classification on the Highway.系统科学,2007-02.
2YONGXUERONG;ZHANGFUJI. AN ASYMPTOTIC PROPERTY OF THE NUMBER OF SPANNING TREES OF DOUBLE FIXED STEP LOOP NETWORKS.基础数学,1997-02.
3. AN　ASYMPTOTIC　PROPERTY　OF　THE　NUMBER　OF　SPANNING　TREES　OF　DOUBLE　FIXED　STEP　LOOP　NETWORKS.基础数学,1997-02.
4XING Ke-fei YANG Jun ZHANG Chuan-sheng WANG Yue-ke. All-digital Carrier Frequency Tracking Method in LEO DS/SS Communication.物理电子学,2006-02.
5Andreas Keler;Jukka M.Krisp;Linfang Ding. Detecting vehicle traffic patterns in urban environments using taxi trajectory intersection points.测绘科学与技术,2017-04.
6MOATASEM Momtaz;QASIM Zeeshan. GPS Navigation Using Adaptive Kalman Filter for Maneuvering Vehicle.计算机应用技术,2008-01.
7CHENGQimin;YANGChongjun;SHAOZhenfeng;LIUDonglin;GAOLiang. Design and Implementation of WebGIS-based GPS Vehicle Monitoring System.测绘科学与技术,2004-02.
8DAI Liwen. PERFORMANCE ANALYSIS OF INTEGRATED GPS/GLONASS CARRIER PHASE-BASED POSITIONING.测绘科学与技术,2001-04.
9Honglei Qin Li Cong Xingli Sun. Accuracy improvement of GPS/MEMS-INS integrated navigation system during GPS signal outage for land vehicle navigation.物理电子学,2012-02.
10Xiao Yan;Cheng Zhang;Shan-Shan Liu;Yan-Wen Liu;David Wei Zhang;Fa-Xian Xiu;Peng Zhou. Two-carrier transport in SrMnBi2 thin films.物理,2017-03.

A 2-step GPS carrier tracking loop for urban vehicle applications

来源期刊

相关推荐

同分类资源更多

相关关键词

A 2-step GPS carrier tracking loop for urban vehicle applications

来源期刊

相关推荐

同分类资源 更多

相关关键词

同分类资源更多