[8], Fig. FPLLSchematics. [8],,, [8],,, ±500Hz,,,, [3,8] ±90,,temptemp ;ωofωop Fig. LoopFilterSchematicsforFPLL FLL PLL y(), NCO z(), z() ;B ;T

Size: px

Start display at page:

Download "[8], Fig. FPLLSchematics. [8],,, [8],,, ±500Hz,,,, [3,8] ±90,,temptemp ;ωofωop Fig. LoopFilterSchematicsforFPLL FLL PLL y(), NCO z(), z() ;B ;T"

称夏侯
5 years ago
Views:

1 39 04 GeomaticsadIformatioScieceofWuhaUiversity Vol.39No. Nov.04 DOI0.303/j.whugis (04) FPLL GPS 3 3,, ,,8003 3,, 针对高动态环境下普通 GPS 接收机跟踪环路容易失锁的问题, 考虑到锁频环动态性能好锁相环跟踪精度高的特点, 实现了二阶锁频环辅助三阶锁相环的载波跟踪环 (FPLL) 根据 FPLL 结构原理和误差分析理论, 提出了一种 FPLL 环路的码相位和载波相位精度分析方法借助 GPS 软件接收机平台, 在 Matlab 环境下仿真实现了 FPLL 载波跟踪环, 并利用 SpiretGSS7700 仿真器采集高动态 GPS 模拟信号对 FPLL 环路进行了测试测试结果和精度分析表明, 在导航信号的载噪比为 40dB-Hz, 加速度为 6g, 加加速度为 9g/s 的条件下, 该高动态跟踪环路能够达到码相位.3m(σ), 载波相位为 m/s(σ) 的跟踪精度锁频环 (FLL); 锁相环 (PLL); 锁频辅助锁相环 (FPLL); 高动态信号 ; 测量精度 P8 A,,, ms,,, GPS (FLL) (PLL)Costas, GPS, 3, FPLL, (IertialNavigatioSystem,INS),, GPS INS, INS, [-], (FPLL) GPS,,,, [3], [4]. FPLL,, 3, [5-6], ;, (4374),,, xliu@whu.edu.c, @qq.com

2 [8], Fig. FPLLSchematics. [8],,, [8],,, ±500Hz,,,, [3,8] ±90,,temptemp ;ωofωop Fig. LoopFilterSchematicsforFPLL FLL PLL y(), NCO z(), z() ;B ;T ;Δf x() ;Δp,,Δf=0, ;Δp=0,.,, σ, FLL [9], PLL,,,,FLL, θd(t)=θ(t)-θ(t) (),FPLL,θ(T) ;T, ;θ(t) NCO [9],,, (x i -u i ) σ i σ= = () 槡槡,i δi=x i-u i,x i i GPS ;u i i

3 39 FPLL GPS 33 () ()),, σ= [θi(i)-θ(i)] θd (i) = 槡槡 (3) B(δτ)= 4δτ-4δ τ (4) -δτ +δτ,δ ;τ SpiretGSS7700 Newstar δ=0.,0.5,0.5,0.75 0M GPS DLL S, 3 3 DLL Fig.3 DiscrimiatorCharacteristicsofDLL.3 SMM (summig [9,-] meamethod),,, [],i θd (i)=θ(i)-θ GPS (i), θ(i) i 烄烌,θ(i) NCO i A =0 lg, σ (3) D [ r( ) ]- (5) A 烆烎. [ C/N 0] = + B[ N ] = GPS +0lg ( ) = (delaylockloop,dll),, +63.dB (6),C ;N ;A, DLL ;D[r()] ;B N ;N 0 [0] S 3 GPSL, GPS MHz ;, MHz,bit, GPS, FPLL, GPS 5 GPS, FPLL 7(a)~7(e),FPLL 3,δ=0.5,,FPLL, ±0.5,, 3 σ FPLL Tab. TrackigPerformacewith HighDyamicSigalsofFPLL (σ) /(db-hz) /(km s - ) /g /(g s - ) /m space.bi /(0-3 m s - )

33 04 4 FPLL Fig.4 TrackigPerformacewith HighDyamicSigalsofFPLL 4 tioadpositioig[j].geomaticsadiforma- 36-39(,,,.GPS/DR GPS, [J]. FPLL,,009,34()36-39), [] ZhagKag,LiLiazhog,Ya A.

4 FPLL Fig.4 TrackigPerformacewith HighDyamicSigalsofFPLL 4 tioadpositioig[j].geomaticsadiforma (,,,.GPS/DR GPS, [J]. FPLL,,009,34()36-39), [] ZhagKag,LiLiazhog,Ya A.Researcho HighDyamicDeeplyItegratedINS+GNSSNavi-, gatiotechology[c].the4th CSNC Essays-S9, Itegrated Navigatioad New Navigatio Meth- GPS, 40dB-Hz, 6g,,FPLL.03 Mbps σ.3m, m/s [] YuXigwag,ZhagXiaohog,LiuJiga,etal. GPS/DR OrigialObservatioItegrated Naviga- tio Scieceof Wuha Uiversity,009,34() ods,wuha,03(,,. + [C]. 9g/s,FPLL,,03).3 m(σ), m/s [3] Ward P W. Performace Comparisos Betwee (σ),fpll FLL,PLLadaNovelFLL AssistedPLL Carrier GPS Trackig Loop Uder RF Iterferece Coditios [C].ION GNSS998,Nashvile,TN,998 [4] TagBi,YuXiaqiog,DogXurog,etal.Desig

5 39 FPLL GPS 333 IteligetCarrierTrackigLoopBasedoSoftware GPSReceiver[J].Jouralof Beijig Uiversity of Aeroauticsad Astroautics,007,33(7)807-80(,,,. GPS, [J]. [0] LiYurog.Performace Aalysisad Achieve- 007,33(7)807-80) [5] XiagYag,HuXiuli.Maximum LikelihoodEsti- matiobased HighDyamicGPSCarrierTrackig Loop[J].Acta Electroica Siica,00,38(7) (,. [] Zhag Tisheg,ZhegJiasheg,Zhag Hog- GPS [J].,00,38 (7) ) pig,etal.carrierphaseextractigadpositioig PerformaceAalysisfortheHighPrecisioSigle- [6] Hurd W,StatmaJ,Vilroter.V.High Dyamic GPS Receiver Usig Maximumlikelihood Estimatio adfrequecytrackig[j].ieee Trao Aerospace ad ElectroicSystems,987,3(4) frequecygpsreceiverdesig[c].thethchia SateliteNavigatioCoferece,Shaghai,0(,,,. GPS [C]. [7] KaplaED,HegartyC.UderstadigGPSPri- ciplesad Applicatios[M].d Editio. Nor- Wood,MAArtech House, [8] Lidsey W C.SychroizatioSystemsiCommu-,,0) []JiagJuwei,Dua Xiaohui,Li Yag,etal.New AlgorithmforGPS C/N0 Estimatio[J].Joural of System Simulatio,009,(4) icatioadcotrol[m].eglewoodclifs,nj Pretice-Hal, [9] QiaZheg, Wag Zhogyu,Liu Guili.Aalysis addata ProcessigofTestErrors[M].Beijig BeihagUiversityPress,008(,,.[M].,008) metfor Sigal Acquisitio ad Trackig About GPSReceiver[D].WuhaWuhaUiversity,007 (.GPS [D].,007) (,,. GPS [J].,009,(4) ) SimulatioadTestigofFPLLCarrierTrackigLoopswith HighDyamicGPSSigals LIU Xiaoli CHEN Dogdog HE Xi 3 LIU Jiga 3 SchoolofElectricalEgieerig,WuhaUiversity,Wuha43007,Chia Troops6507,Dadog8003,Chia 3 CeterofGNSS,WuhaUiversity,Wuha430079,Chia AbstractThecovetioaltrackigloopsiGPSreceiversusualyloselockedhighdyamicsigals. Thus,toachievebeterFLLperformaceidyamicsituatiosadhigherPLL measuremetaccura- cy,weimplemetedasecodorderflliaassistedthirdorderpll (FPLL)basedcarriertrackig loop.thesemethodswereemployedtoaalyzethemeasuremetaccuracyfpllofcodeadcarrier phases,adimplemetedooursoftwarereceiverplatform with Matlab.FPLL wastestedusigthe datacolectedthroughspiretgss7700simulator.theresultsshowthattheaverage measuremet accuracyforcodethephaseadcarrierphasewas.3m (σ)ad m/s(σ),respective- ly,asthesigalsarearoud40db/hzofsnr (sigaltooiseratio),with6gofacceleratioad 9g/sofjerk. Keywordsfrequecylockloop(FLL);phaselockloop(PLL);FLLassistedPLL (FPLL);highdy- amicsigal;measuremetaccuracy FirstauthorLIU Xiaoli,associateprofessor,specializesisigalprocessigforsateliteavigatiosystemsadweaksigaldetectio. xliu@whu.edu.c CorrespodigauthorCHEN Dogdog,postgraduatio @qq.com FoudatiosupportTheNatioalNaturalScieceFoudatioofChia,No.4374.

绝密★启用前

绝密★启用前绝密启用前 2010 年普通高等学校招生全国统一考试 ( 上海卷 ) 地理试卷一选择题 ( 共 50 分, 每小题 2 分每小题只有一个正确答案 ) ( 一 ) 城市, 让生活更美好, 城市空间结构与城市职能自然环境密切相关 1. 不同的城市职能具有不同