40 3 :BOC 407, BOC,() (2), A, : R sc (n)= a k gmt s (m)sc Ts (m) m=0 k k2 a k2 g(m-n)t s (m -n) (3) T c=kt s, k, BOC, Fig. BOCSignalModulation k BOC,

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1 GeomaticsandInformationScienceofWuhanUniversity Vol.40No.3 March205 DOI:0.3203/j.whugis : (205) BOC,, :BOC(binaryofsetcarrier),BOC GPS BOC, BOC,, BOC, BOC(pn,n) (p ),, BOC 0dB,, BOC : ;BOC ; :TN96;P228.4 :A,,BOC BOC [-3] ; BOC,. BOC [4] BOC(,), BOC BOC(fs,fc)BOC(α, β ) BOC(fs,fc),fs BPSK [5-8] [8-2] ( MHz), T s, [3] [4] FFT fc (Mchip/s), [5] T c, BOC(α, β ), α,, f0=.023 MHz, β f0 GPS,,BOC(0.23,5.5)BOC (0,5), BOC 0.23 MHz,,, 5.5 MHzBOC BOC k=2α/ BOC(,) β, T c= kt, s -,BOC : 25dB, -28dB, BOC(,) s(n)= Ad(n) a k gnts(n)sc Ts (n) k, cos(2πf0nt s +φ ) ( ) BOC,A ;d(n) ;sc Ts, BOC(pn,n) (p ) T s ;gnts(n) nt s ;a k, ±;f0, ; φ BOC BOC(pn,n), ( ) BOC ( ) BOC : : (427403) :,,, / zyba nvy@26.com

BOCSignalModulation k BOC, BOC f0, Matlab BOC(,),, BOC(6,2)BOC(6,)3, 3 /fs,gps, 3 3 GPS,BOC,BOC GPS,, (2), BOC, BOC,

2 40 3 :BOC 407, BOC,() (2), A, : R sc (n)= a k gmt s (m)sc Ts (m) m=0 k k2 a k2 g(m-n)t s (m -n) (3) T c=kt s, k, BOC, Fig. BOCSignalModulation k BOC, BOC f0, Matlab BOC(,),, BOC(6,2)BOC(6,)3, 3 /fs,gps, 3 3 GPS,BOC,BOC GPS,, (2), BOC, BOC, 2 BOC, BOC(6,2) Fig.2 ResultsofAutoCorrelation, BOC(3,) BOC(3,),.2 BOC BOC,BOC GPS, BOC,, BOC,, BOC BOC(pn,n) GPS, PRN, BOC PRN FFT PRN :, c(n )= a k2 gn Ts(n ) (2) k2,,, 3 BOC Fig.3 ResultsofCrossCorrelation 3,, 2 6 2, 2,, k, 2

x(m)e -j2πmk N x(m)y(m -n)e -j2πnk N n=0 y(m +n)e j2π(m-n)k N N X (k)y *

y(n)dft, 6 BOC(4,2) :, FFT ;, FFT, IFFT, BOC GPS, BOC, SNR=-28dB BOC(,),

4 4 BOC(,) AcquisitionResultofBOC(,) 5 BOC(6,) Fig.

3 N x(n)y(n), : r xy (n)= x(m)y(m -n) (4) m=0 (4) DFT,: R xy (k)= m=0 n=0 m=0 x(m)e -j2πmk N x(m)y(m -n)e -j2πnk N n=0 y(m +n)e j2π(m-n)k N N X (k)y * (k) = = (5),X(k)x(n)DFT ;Y(k)y(n) DFT ;Y * (k)y(k) (4) (5), DFT x(n)dft y(n)dft, 6 BOC(4,2) :, FFT ;, FFT, IFFT, BOC GPS, BOC, SNR=-28dB BOC(,), 4;SNR= -20dB BOC(6,) BOC(4,2)BOC(7, ), 5~ 7 Fig.4 4 BOC(,) AcquisitionResultofBOC(,) 5 BOC(6,) Fig.5 AcquisitionResultofBOC(6,) Fig.6 AcquisitionResultofBOC(4,2) 7 BOC(7,) Fig.7 AcquisitionResultofBOC(7,) 2.2.2, k BOC, 2k, k, 3,,, IFFT 4~7,, BOC(6,),, {,-,,-,,-,,-, BOC,-,,-,-,,-,,-,,-,,-,,, BOC -,}

40 3 :BOC 409, : IFFT, BOC,, 8 9 BOC(6,) Fig.

0 AcquisitionResultofBOC(7,) =-30dB, 2fs, 8246 3548

9~2,SNR=-30dB, BOC,,, BOC(0,2) BOC 0dB, Fig.

4 40 3 :BOC 409, : IFFT, BOC,, 8 9 BOC(6,) Fig.9 AcquisitionResultofBOC(6,) 8 Fig.8 ImprovedAcquisitionAlgorithm ,BOC(6,) BOC(4,2) BOC(7,), -20dB, 0 BOC(7,), SNR Fig.0 AcquisitionResultofBOC(7,) =-30dB, 2fs, BOC(6,) BOC(7,) BOC(0, 2)BOC(4,2), 9~2 9~2,SNR=-30dB, BOC,,, BOC(0,2) BOC 0dB, Fig. AcquisitionResultofBOC(0,2) ;,, BOC 3,,,, BOC(5,2),, BOC(pn,n) (p ),, 2 BOC(4,2) Fig.2 AcquisitionResultofBOC(4,2)

5 ,,.Compass [J].,200,40(5): ) [3] Wang Ershen,Zhang Shufang,Zhang Zhixian.Re- search Status and Trend of Mitigating Multipath BOC, EfectsTechnologyforGPSReceiver[J].Telecommu- BOC, BOC nication Engineering,20,5():4-9(, GPS ;,.GPS, BOC, [J].,20,5():4-9) BOC, [4] ChenXiang,QiJiamin,ChenJiapin.AnNovelUn- BOC ambiguoussynchronizationschemeforboc(n,n) ;, Signals[J].Science Technology and Engineering,, BOC 202,2(6):268-27(,,., BOC(n,n) [J]. BOC(6,),202,2 (6):268-27) BOC(4,2)BOC(7,) [5] ZaixiuYang,ZhigangHuang,ShengqunGeng.Ac-, quisitionperformanceanalysisofbocsignalcon- sideringthecodesearchstepsize[j].journalof )BOC Computers,20,6(7): ; [6] ZhangZhongying,ZhangLixin,MengYansong,et 2), al.studyofacquisitiontechnologyforalt-boc, Signal[J].Modern Electronics Technique,202,35, BOC(pn,n) (5):55-59(,,.ALT-BOC (p ); (5):55-59) 3) [7] YangZaixiu,HuangZhigang,GengShengqun.Al- BOC, p ternatebinaryofsetcarriersignalacquisitional-,, BOC gorithm [J].Journalof Nanjing University of Scienceand Technology,202,36(3): ( ;,,. 4) [J].,202,36(3): BOC(pn,n) (p ), ), BOC [8] YangZaixiu,HuangZhigang,GengShengqun.Ac- 0dB, quisitionperformanceanalysisofbocsignalcon-, sideringthecodesearchstepsize[j].journalof Computers,20,6(7): , [9] BenedetoF,GiuntaG,LohanES,etal.A Fast BOC(pn,n) (p ), Unambiguous Acquisition Algorithm for BOC-, ModulatedSignals[J].IEEE Transactionson Ve-, BOC hicular Technology,203,62(3): [0]QiJiamin,ChenJiapin,LiZhenbo,etal.Unam- [] Feng Yongxin,Qian Bo,Liu Fang.Research on PN Code Synchronization Algorithm for TDDM- BasedBOC ModulationSignal[J].Journalof As- tronautics,20,32(3):645-65(,,. TDDM BOC ternational Conference on Telecommunications, [J].,20,32(3):645-65) [2] TangZuping,Zhou Hongwei,HuXiulin,etal.Re- Stutgart,Germany,202 [2]YaoZheng,Lu Mingquan,FengZhenming.Unam- searchon PerformanceEvaluationofCompassSignal [J].Scientia Sinica,200,40(5): (, [J].,202,35 biguous BOC Modulated Signals Synchronization Technique [J].IEEE Communications Leters, 202,6(7): []YuChangha,ParkJI,LeeYP,etal.Unambigu- ousbocsignalacquisitionbasedonrecombination ofsub-correlations[c].theeighth AdvancedIn- biguoussine-phasedbinaryofsetcarrier Modula- tedsignalacquisitiontechnique[j].ieee Trans-

6 40 3 :BOC 4 actionson WirelesCommunications,200,9(2): [3]Feng Yongxin,Xu Meirong,Liu Xiantao,etal. Main Lobe Overlapped Acquisition Algorithm of FrequencyDomainBasedonBOC ModulationSignal [J].Journalof Data Acquisition & Procesing, neering,202,2(9): (,,. FFT [J].,202,2 (9): ) [5]ChenXiang.ArithmeticResearchandSimulationof 202,27():26-3(,,,.,202,27():26-3) [4]HeLu,LuZhenpeng,LiJian,etal.DesignandIm- plementof Acquisition Based on Partial Matched BOC SignalSynchronization Based on XilinxISE versity,202(. XilinxISE FPGA BOC [D]. :,202) AnImprovedCodePhaseAcquisitionAlgorithmforBOCSignal ZHU Yinbing LI Bao LIU Rui ElectricEngineeringInstitute,NavalEngineeringUniversity,Wuhan430033,China FiltersandFFT[J].Science Technology and Engi- BOC [J]. andfpga[d].shanghai:shanghaijiaotonguni- Abstract:AutocorrelationfunctionresultsforaBOCsignalshowthatithasmulti-values,therefore theacquisitionofabocsignalcannotsimplytransplantthealgorithmofgpssignal.thus,aparalel codephasesearchalgorithmandthecrosscorrelationcharacteristicsofbocsignalareanalyzedand thevalidityofparalelcodephasesearchalgorithmonbocsignalissimulated.animprovedacquisi- tionalgorithmispresentedandusedtoanalyzebocsignal,addressingtheinsuficienciesoftheparal- lelcodephasesearchalgorithmfortheacquisitionofbocsignalatlow SNR(signaltonoiseratio). TheresultsshowthattheimprovedalgorithmisfitforBOC(pn,n)signalwherepisaninteger,ex- pandingtheapplicationareaforparalelcodephasesearchalgorithms.theimprovedalgorithm can improvesnrofacquisition0dbascomparedtothatoftheparalelcodephasesearchalgorithm.the improvedalgorithmcanenhanceacquisitionsensitivityofreceivers,animportantaidinthedesignof acquisitionalgorithmsforreceivers. Keywords:satelitenavigation;BOC modulation;paralelcodephasesearch Firstauthor:ZHU Yinbing,PhD,lecturer,specializesinthetheoriesandmethodsofradioandsatelitenavigation. zyba nvy@ 26.com Foundationsupport:TheNationalNaturalScienceFoundationofChina, No 檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪檪 ( 352) omaticmergingapproachbasedonthegreedyandsimulatedannealingalgorithms.firstly,thegreedy algorithm wasusedtomergethesmaltexturesautomaticaly.secondly,asimulatedannealingalgo- rithm wasusedtooptimizethe mergedresultsinordertoensurethattheresultsconvergedtothe globaloptimum.thewholeprocessofthetexture mergingisaccomplishedautomaticaly.finaly, someexperimentsbasedonthisapproacharetestedanddiscussed.experimentalresultsdemonstrate theefectivenessofthisapproach. Keywords:three-dimensionalmodel;texture merging;greedyalgorithm;simulatedannealingalgo- rithm;texturespace Firstauthor:DAIXuefeng,PhDcandidate,specializesinvisualizationof3Dspatialdataofcyberspace. daixuefeng203@26.com Correspondingauthor:XIONG Hanjiang,PhD,professor. xionghanjiang@63.com Foundationsupport:TheNationalHighTechnologyResearchandDevelopmentProgramofChina(863Program),Nos,202BAH35B03, 203AA2A203;theTechnologyResearchandDevelopmentProgramofShenzhen,No.ZDSY

NP [11] 7) 4)~ 6) ( ) : Kirk- patrick [26] 1 Fig.1 TextureMergingSketch Map ) 2) 3) 1 4) 5)

NP [11] 7) 4)~ 6) ( ) : Kirk- patrick [26] 1 Fig.1 TextureMergingSketch Map ) 2) 3) 1 4) 5) 40 3 2015 3 GeomaticsandInformationScienceofWuhanUniversity Vol.40No.3 March2015 DOI:10.13203/j.whugis20140231 :1671-8860(2015)03-0347-06 1 1 1 1 430079 : : :P208TP751 :A ISOMAP [1] [2] [25] [3] [4-10]