外文翻译--无线传感器网络的测距技术

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1、外文翻译一无线传感器网络的测距技术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班姓名王成学号2009315213外文出处WirelessSensorNetworksANetworkingPerspective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口外文原文复印件83RANGINGTECHNIQUESFORWIRELESSSENSORNETWORKSTheRElocationsensorsoperatingindifferentenvironmentscanmeasuretheRSSAOA

2、phaseofarrivalPOATOAandsignatureofthedelaypowerprofileaslocationmetricstoestimatethereingingdistancc[47]ThedeploymentenvironmentiewirelessRFchannelwillconstraintheaccuracyandtheperformanceofeachtechniqueInoutdooropenareastheserangingtechniquesperformverywellHoweverasthew

3、irelessmediumbecomesmorecomplexforexampledenseurbanorindoorenvironmentsthechannelsuffersfromseveremultipathpropagationandheavyshadowfadingconditionsThisfindinginturnimpactstheaccuracyandperformanceinestimatingtherangebetweenapairofnodesForthisreasonthischapterwi11focusit

4、srangingandlocalizationdiscussiononindoorenvironmentsThisisimportantbecausemanyoftheWSNapplicationsareenvisionedfordeploymentinroughtcrrainandclutteredenvironmentsandunderstendingoftheimpactofthechannelontheperformaneeofrangingandlocalizationisimportantInadditionrangemea

5、surementsusingPOAandAOAinindoorandurbanareasareunreliableThereforewewillfocusourdiscussionontwopracticaltechniquesTOAandRSSThesetworangingtechniqueswhichhavebeenusedtraditionallyinwirelessnetworkshaveagreatpotentialforuseinWSNlocalizationTheTOAbasedrangingissuitableforac

6、curatcindoorlocalizationbecauseitonlyneedsafewreferencesandnopriortrainingByusingthistechniquehoweverthehardwareiscomplexandtheaccuracyissensitivetothemultipathconditionandthesystembandwidthThistechniquehasbeenimplementedinGPSPinPointWearNetIEEE802153andIEEE802154systems

7、TheRSSbasedrangingontheotherhandissimpletoimplcmcntandisinsensitivetothemultipathconditionandthebandwidthofthesystcmInadditionitdocsnotneedanysynchronizationandcanworkwithanyexistingwirelesssystemthatcanmeasuretheRSSForaccurateranginghoweverahighdensityofanchorsorreferen

8、cepointsisneededandextensivetrainingandcomputationallyexpensivealgorithmsarcrequiredTheRSSranginghasbee