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1、3836IEEETRANSACTIONSONINDUSTRIALELECTRONICS,VOL.60,NO.9,SEPTEMBER2013ADistributedTDMASchedulingAlgorithmforTargetTrackinginUltrasonicSensorNetworksPengCheng,Member,IEEE,FanZhang,JimingChen,SeniorMember,IEEE,YouxianSun,andXuemin(Sherman)Shen,Fellow,IEEEAbstractUltrasonicsensorsarea
2、bletoprovidehighlyac-canbecategorizedintotwoclasses,cooperative[4],[5]andcuratemeasurementsiftheyareproperlyscheduled,otherwise,noncooperativeones[6],[8].Acooperativetarget,aspartoftheintersensorinterference(ISI)couldgreatlydeterioratethethenetwork,canemitcertainformsofphysicalsig
3、nalsthatperformance.Inaddition,theschedulingschemeshouldbeper-revealitspresenceorreportitsownidentification.Inthenon-formedinadistributedandenergy-efficientwaysothatitcanbeconvenientlyimplementedforalarge-scalenetwork.Inthiscooperativescenario,however,thetargetwillnotprovideanypaper
4、,fortargettrackingwithmultipleultrasonicsensors,weinformationofitsownexistencetothenetworkcooperatively.converttheISIavoidanceproblemtotheproblemofmultipleTherefore,thesensornodeshavetoemitthesignalactivelyaccessinasharedchannelandadoptthetimedivisionmulti-sothatthetargetcanbedete
5、ctedbythefeedbacksignal.pleaccessstrategywhichhasthepropertiesofbeingcollisionForexample,atrackingsystemfornoncooperativetargetsisfreeandenergyefficient.Then,bygraphtheory,theschedulingproblemistransformedintoacoloringproblemwhichaimsatdesignedin[8]byutilizingthepassiveinfraredsens
6、orsforminimizingthenumberofusedcolors.Sincetheoriginalproblemtargetdetectionandactiveultrasonicsensorsforranging.hasbeenprovedtobeNP-hard,weproposeadistributed-Innoncooperativetrackingsystemswheretheecho-basedsaturation-degree-basedalgorithm(DSDA)whichcanbeimple-sensorslikeultraso
7、nicsensorsareused,theintersensorinter-mentedlocallybyeachnodewithinformationcollectedfromference(ISI)becomessevereparticularlywhennearbyactiveitsneighbors.Furthermore,weverifythataninterference-freescheduleisguaranteedtobeobtainedbyDSDA.Wederiveana-sensorsworksimultaneouslyinthesa
8、mefrequencyband.Suchlyticalresult
