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1、IEEESENSORSJOURNAL,VOL.5,NO.6,DECEMBER20051469AnalysisofSpreadSpectrumTimeDomainReflectometryforWireFaultLocationPaulSmith,Member,IEEE,CynthiaFurse,SeniorMember,IEEE,andJacobGunther,Member,IEEEAbstract—Spreadspectrumtimedomainreflectometry(SSTDR)oftenc
2、annotbereplicatedorlocated.Duringthefewmillisec-andsequencetimedomainreflectometryhavebeendemonstratedondsitisactive,theintermittentfaultisasignificantimpedancetobeeffectivetechnologiesforlocatingintermittentfaultsonair-mismatchthatcanbedetected,rather
3、thanthetinymismatchcraftwirescarryingtypicalsignalsinflight.Thispaperexaminesobservedwhenitisinactive.Awiretestingmethodthatcouldtheparametersthatcontroltheaccuracy,latency,andsignaltonoiseratioforthesemethods.Bothtestmethodsareshowntobetestthewiresco
4、ntinually,includingwhiletheplaneisinflighteffectiveforwirescarryingACpowersignals,andSSTDRisshownwould,therefore,haveatremendousadvantageoverconven-tobeparticularlyeffectiveattestingwirescarryingdigitalsig-tionalstatictestmethods.nalssuchasMil-Std1553
5、data.ResultsaredemonstratedforbothAnotherimportantreasontotestwiresthatareliveandincontrolledanduncontrolledimpedancecables.Thelowtestsignalflightistoenablearcfaultcircuitbreakertechnology[5]thatislevelsandhighnoiseimmunityofthesetestmethodsmakethemwe
6、llsuitedtotestforintermittentwiringfailuressuchasopencir-beingdevelopedtoreducethedangeroffireduetointermittentcuits,shortcircuits,andarcsoncablesinaircraftinflight.shortcircuits.Unliketraditionalthermalcircuitbreakers,thesenewcircuitbreakerstriponnois
7、ecausedbyarcsratherthanre-IndexTerms—Agingwiredetection,arcdetection,sequencetimedomainreflectometry(STDR),spreadspectrumtimedomainre-quiringlargecurrents.Theproblemisthatlocatingthetinyfaultflectometry(SSTDR),timedomainreflectometry(TDR),wirefaultafter
8、thebreakerhastrippedisextremelydifficult,perhapsim-detection.possible.Locatingthefaultbeforethebreakertripscouldenablemaintenanceaction.Thispaperdescribesandanalyzesonesuchmethod,basedI.INTRODUCTIONonspreadspectrumcommunicationtechniquesthatcandojustO
