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1、第6期李文鋒等:基于RBS的無(wú)線(xiàn)傳感器網(wǎng)絡(luò)時(shí)間同步算法·85·基于RBS的無(wú)線(xiàn)傳感器網(wǎng)絡(luò)時(shí)間同步算法李文鋒1,王汝傳1,2,孫力娟1(1.南京郵電大學(xué)計(jì)算機(jī)科學(xué)與技術(shù)系,江蘇南京210003;2.南京大學(xué)計(jì)算機(jī)軟件新技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室,江蘇南京210093)摘要:提出了一種改進(jìn)的時(shí)間同步算法IRBS(improvedreferencesbroadcastsynchronization),它是在RBS算法的基礎(chǔ)上,根據(jù)接收節(jié)點(diǎn)的時(shí)間值,估算出實(shí)際時(shí)間值,并利用估計(jì)時(shí)間來(lái)實(shí)現(xiàn)時(shí)間的同步。仿真結(jié)果表明,IRBS算法能夠縮小時(shí)間誤差,有效
2、提高時(shí)間同步的精度。關(guān)鍵詞:無(wú)線(xiàn)傳感器網(wǎng)絡(luò);時(shí)間同步;誤差估計(jì);改進(jìn)的參考廣播同步中圖分類(lèi)號(hào):TP391文獻(xiàn)標(biāo)識(shí)碼:B文章編號(hào):1000-436X(2008)06-0082-05ProvedwirelesssensornetworkstimesynchronizationalgorithmbasedonRBSLIWen-feng1,WANGRu-chuan1,2,SUNLi-juan1(1.DepartmentofComputerScienceandTechnology,NanjingUniversityofPostsandTel
3、ecommunications,Nanjing210003,China;2.StateKeyLaboratoryforNovelSoftwareTechnology,NanjingUniversity,Nanjing210093,China)Abstract:IRBSalgorithmwasproposedonRBS.Accordingtoreceivernodetime,IRBSestimateitsrealtime.Duringitscalculationoftwonodestimedifference,itrealizeat
4、imesynchronizationbytheestimatingtime.SimulationresultshowsIRBSalgorithmcanreducetimeerrorandimprovetimesynchronizationprecision.Keywords:wirelesssensornetwork;timesynchronization;errorestimation;improvedreferencebroadcastsynchronization第6期李文鋒等:基于RBS的無(wú)線(xiàn)傳感器網(wǎng)絡(luò)時(shí)間同步算法·85·
5、1引言收稿日期:2007-06-19;修回日期:2008-04-22基金項(xiàng)目:國(guó)家自然科學(xué)基金資助項(xiàng)目(60573141,60773041);國(guó)家高資助技術(shù)研究發(fā)展計(jì)劃(“863”計(jì)劃)基金資助項(xiàng)目(2006AA01Z201,2006AA01Z219,2007AA01Z404,2007AA01Z478);江蘇省高技術(shù)研究計(jì)劃基金資助項(xiàng)目(BG2006001);2006江蘇省軟件專(zhuān)項(xiàng);南京市高科技基金資助項(xiàng)目(2007軟資106,2007軟資127);現(xiàn)代通信國(guó)家重點(diǎn)實(shí)驗(yàn)室基金資助項(xiàng)目(9140C1105040805);江蘇省計(jì)算機(jī)
6、信息處理技術(shù)重點(diǎn)實(shí)驗(yàn)室基金資助項(xiàng)目(kjs06006)FoundationItems:TheNationalNaturalScienceFoundationofChina(60573141,60773041);TheNationalHighTechnologyResearchandDevelopmentProgramofChina(863Program)(2006AA01Z201,2006AA01Z219,2007AA01Z404,2007AA01Z478);TheProvincialJiangsuHighTechnologyRe
7、searchProgram(BG2006001);TheSpecialFundforSoftwareTechnologyofJiangsuProvince;TheHighTechnologyResearchProgramofNanjing(2007RZ106,2007RZ127);TheNationalKeyLaboratoryFoundationforModernCommunications(9140C1105040805);TheKeyLaboratoryFoundationofInformationTechnologyPro
8、cessingofJiangsuProvince(kjs06006)無(wú)線(xiàn)傳感器網(wǎng)絡(luò)是由大量的微傳感器節(jié)點(diǎn)采用無(wú)線(xiàn)自組織方式構(gòu)成的網(wǎng)絡(luò)[1],應(yīng)用于國(guó)防、環(huán)保、交通、醫(yī)療及制造業(yè)等領(lǐng)域[2]。時(shí)間同步是無(wú)線(xiàn)傳感器網(wǎng)絡(luò)的一項(xiàng)重要支撐技術(shù),影響傳感器網(wǎng)絡(luò)