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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）8.3RANGINGTECHNIQUESFORWIRELESSSENSORNETWORKSTheRFlocationsensorsoperatingindifferentenvironmentscanmeasuretheRSS,AOA
2、,phaseofarrival(POA),TOA,andsignatureofthedelay-powerprofileaslocationmetricstoestimatetherangingdistance[4,7].Thedeploymentenvironment(i.e.,wirelessRFchannel)willconstraintheaccuracyandtheperformanceofeachtechnique.Inoutdooropenareas,theserangingtechniquesperformverywell.Howev
3、er,asthewirelessmediumbecomesmorecomplex,forexample,denseurbanorindoorenvironments,thechannelsuffersfromseveremultipathpropagationandheavyshadowfadingconditions.Thisfindinginturnimpactstheaccuracyandperformanceinestimatingtherangebetweenapairofnodes.Forthisreason,thischapterwil
4、lfocusitsrangingandlocalizationdiscussiononindoorenvironments.ThisisimportantbecausemanyoftheWSNapplicationsareenvisionedfordeploymentinroughterrainandclutteredenvironmentsandunderstandingoftheimpactofthechannelontheperformanceofrangingandlocalizationisimportant.Inaddition,rang
5、emeasurementsusingPOAandAOAinindoorandurbanareasareunreliable.Therefore,wewillfocusourdiscussionontwopracticaltechniques,TOAandRSS.Thesetworangingtechniques,whichhavebeenusedtraditionallyinwirelessnetworks,haveagreatpotentialforuseinWSNlocalization.TheTOAbasedrangingissuitablef
6、oraccurateindoorlocalizationbecauseitonlyneedsafewreferencesandnopriortraining.Byusingthistechnique,however,thehardwareiscomplexandtheaccuracyissensitivetothemultipathconditionandthesystembandwidth.ThistechniquehasbeenimplementedinGPS,PinPoint,WearNet,IEEE802.15.3,andIEEE802.15
7、.4systems.TheRSSbasedranging,ontheotherhand,issimpletoimplementandisinsensitivetothemultipathconditionandthebandwidthofthesystem.Inaddition,itdoesnotneedanysynchronizationandcanworkwithanyexistingwirelesssystemthatcanmeasuretheRSS.Foraccurateranging,however,ahighdensityofanchor
8、sorreferencepointsisneededandextensivetrainingandcompu
