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1、第55卷第6期電訊技術(shù)Vo1.55.No.62015年6月TelecommunicationEngineeringJune,2015doi:10.3969/j.issn.1001-893x.2015.06.012引用格式:周楊,張?zhí)祢U,錢(qián)文瑞.多徑環(huán)境下TDDM—BOC信號(hào)偽碼周期估計(jì)[J].電訊技術(shù),2015,55(6):651—657.[ZHOUYang,ZHANGTianqi,QIANWenrui.PeriodEstimationofPNSequenceforTDDM-BOCSignalinMuhipathEnvironment[J].Telecommunicati。nE
2、ngineer-ing,2015,55(6):651-657.]多徑環(huán)境下TDDM—BOC信號(hào)偽碼周期估計(jì)周楊料,張?zhí)祢U,錢(qián)文瑞(重慶郵電大學(xué)信號(hào)與信息處理重慶市重點(diǎn)實(shí)驗(yàn)室,重慶400065)摘要:針對(duì)低信噪比下存在多徑效應(yīng)的時(shí)分?jǐn)?shù)據(jù)調(diào)制二進(jìn)制偏移載波(TDDM—BOC)調(diào)制信號(hào)的偽碼周期估計(jì)難題。提出了一種基于二次譜的TDDM—BOC信號(hào)偽碼周期估計(jì)算法。該算法首先推導(dǎo)出多徑環(huán)境下TDDM—BOC信號(hào)模型,然后求出多徑TDDM—BOC信號(hào)的功率譜,再求其二次譜,最后通過(guò)檢測(cè)二次譜的尖峰脈沖間的間距得到多徑環(huán)境下TDDM—BOC信號(hào)的偽碼周期。實(shí)驗(yàn)過(guò)程中采用累加平均的方法可以達(dá)
3、到降噪和精確估計(jì)的目的。仿真結(jié)果表明:該算法能夠在多徑環(huán)境下對(duì)TDDM—BOC信號(hào)偽碼周期進(jìn)行有效估計(jì)。且估計(jì)性能與多徑環(huán)境有密切關(guān)系,這為今后我國(guó)“北斗”導(dǎo)航接收設(shè)備的開(kāi)發(fā)提供了一定的理論參考。關(guān)鍵詞:衛(wèi)星導(dǎo)航系統(tǒng);TDDM—BOC信號(hào);多徑環(huán)境;二次譜;偽碼周期估計(jì)中圖分類(lèi)號(hào):TN911.7文獻(xiàn)標(biāo)志碼:A文章編號(hào):1001—893X(2015)06—0651—07PeriodEstimationofPNSequenceforTDDM-BOCSignalinMultipathEnvironmentZHOUYang,ZHANGTianqi,QIANWenrui(Chongqin
4、gKeyLaboratoryofSignalandInformationProcessing,ChongqingUniversityofPostsandTelecommunications,Chongqing400065,China)Abstract:Fortheproblemofestimatingpseudo—codeperiodofTimeDivisionDataModulation—BinaryOif-setCarrier(TDDM-BOC)signalwithmuhipatheffectunderlowsignal-to-noiseratio(SNR),analgor
5、ithmbasedonquadraticspectrumisproposedtoestimatethepseudo-codeperiodofTDDM-BOCsigna1.First—ly,theTDDM—BOCsignalmodelinmuhipathenvironmentisderived.ThenthepowerspectrumofthemuhipathTDDM—BOCsignalisfound,itssecondaryspectrumcanbeobtainedbyusingFouriertransformofthepowerspectrum.Finally,thepseu
6、do—codeperiodofTDDM-BOCsignalinmuhipathenvironmentcanbegotbydetectingspacingbetweenpeakpulses.Themethodofaccumulativeaverageisadoptedtoa-chievethepurposeofnoisereductionandaccurateestimation.Simulationresultsshowthatthepseudo-codeperiodofTDDM——BOCsignalinmultipathenvironmentiseffectivelyesti
7、matedbyusingthealgorithmanditsperformancecloselyrelateswiththemultipathenvironment.IthasacertainreferencevalueforBei—dounavigationreceiverdesign.Keywords:satellitenavigationsystem;TDDM—BOCsignal;muhipathenvironment;quadraticspectrum;pseudo—-codeper