Research of Target Localization Algorithms Based on Wireless Sensor Network

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1、万方数据传感器与仪器仪表<微计算机信息>(测控自动化)2009年第25卷第2-1期文蕈编号：1008-0570(2009)02一l-014枷3ResearchofTargetLocalizationAlgorithmsBasedonWirelessSensorNetwork(AirForceRadarAcademy)CHENXiang—pingFANGLiAbstract：WirelessSensorNetworkisanoveltechnologyacrossmulti—subject．Ithasbroadapplicationinsurroundingsmeas

2、ure，re—motesensing，targetlocalizationandsoon．Thepaperanalyzesseveralmaintargetlocalizationalgorithmsatpresent，proposestheimprovedmeasureoflocalizationalgorithmbasedonseeingandhearingmeasure，whichishelpfulforfurtherresearch．Keywords：WirelessSensorNetwork；targetlocalization；Algorithm1Int

3、roductionWireless8enornetworkisapopularnetworktechnologytheseyears．Itismadeupofnlas8littlevolumeandlowcostsensornodes，whichintegratesensor，datacollection，handlingandwire-lesscommunicationunit．Itisanintelligentsystemofcompletingmissionintermsofenvironmentautomatically．Eachnodecande-teet

4、environmentaroundindependently，thencooperateseachothertorealizecomplicatefunctions，suchintrusiondetection，targettracingandlocalization，environmentdetectionandremotesensing．WirelesssenornetworkCallbeusedingeophysics(earthquakede-tectionforexample)，militarysystem，emergencyandrescuing，tra

5、fficdetection，biologyresearchetc，thesefieldsusuallylackofsupportofconventionalnetworkinfrastructure0nternet，GPSandmobilecommunicationnetworketc)．Targetlocalizationmeansthatestimatinglocationofdetectedtargetinwirelesssensornetworkatsometime．Accordingtothedifferenceofsignaldetectionunit，

6、atpresenttargetlocalizational-gorithmsmainlyhavelocalizationalgorithmbasedonTOAestima-tion，localizationalgorithmbasedonTDOAestimationandlocal-izationalgorithmbasedonDOAestimationetc．Whilethesealgo-rithmshavesomeshortcomingsandneedtobefurtherresearchedandimproved．Thispaperanalyzessevera

7、lordinaryalgorithms，andimproveslocalizationalgorithmbasedonseeingandhearingesti-mation．2Analyseoflocalizationalgorithm"2．1localizationalgorithmbasedonTOAestimationLocalizationalgorithmbasedonTOA(timeofarrival，TOA)estimationmainlyhascirclelocalizationandgloballocalization．Figure1shows