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1、河北建筑工程学院毕业设计（论文）外文资料翻译系别：电气系专业：电子信息工程班级：电子092班姓名：学号：2009315213外文出处：Wireless.Sensor.Networks：A.Networking.Perspective附件：1、外文原文；2、外文资料翻译译文。指导教师评语：签字：年月日1、外文原文（复印件）8.3RANGINGTECHNIQUESFORWIRELESSSENSORNETWORKSTheRFlocationsensorsoperatingindifferentenvi
2、ronmentscanmeasuretheRSS,AOA,phaseofarrival(POA),TOA,andsignatureofthedelay-powerprofileaslocationmetricstoestimatetherangingdistance[4,7].Thedeploymentenvironment(i.e.,wirelessRFchannel)willconstraintheaccuracyandtheperformanceofeachtechnique.Inoutd
3、ooropenareas,theserangingtechniquesperformverywell.However,asthewirelessmediumbecomesmorecomplex,forexample,denseurbanorindoorenvironments,thechannelsuffersfromseveremultipathpropagationandheavyshadowfadingconditions.Thisfindinginturnimpactstheaccura
4、cyandperformanceinestimatingtherangebetweenapairofnodes.Forthisreason,thischapterwillfocusitsrangingandlocalizationdiscussiononindoorenvironments.ThisisimportantbecausemanyoftheWSNapplicationsareenvisionedfordeploymentinroughterrainandclutteredenviro
5、nmentsandunderstandingoftheimpactofthechannelontheperformanceofrangingandlocalizationisimportant.Inaddition,rangemeasurementsusingPOAandAOAinindoorandurbanareasareunreliable.Therefore,wewillfocusourdiscussionontwopracticaltechniques,TOAandRSS.Thesetw
6、orangingtechniques,whichhavebeenusedtraditionallyinwirelessnetworks,haveagreatpotentialforuseinWSNlocalization.TheTOAbasedrangingissuitableforaccurateindoorlocalizationbecauseitonlyneedsafewreferencesandnopriortraining.Byusingthistechnique,however,th
7、ehardwareiscomplexandtheaccuracyissensitivetothemultipathconditionandthesystembandwidth.ThistechniquehasbeenimplementedinGPS,PinPoint,WearNet,IEEE802.15.3,andIEEE802.15.4systems.TheRSSbasedranging,ontheotherhand,issimpletoimplementandisinsensitivetot
8、hemultipathconditionandthebandwidthofthesystem.Inaddition,itdoesnotneedanysynchronizationandcanworkwithanyexistingwirelesssystemthatcanmeasuretheRSS.Foraccurateranging,however,ahighdensityofanchorsorreferencepointsisneededandextensivetrainingandcompu
