西南师范大学学报(自然科学版)
西南師範大學學報(自然科學版)
서남사범대학학보(자연과학판)
Journal of Southwest China Normal University (Natural Science Edition)
2015年
9期
23-29
,共7页
无线传感网络%贝叶斯估计%最小二乘%最大似然估计%最小均方误差%迭代最小二乘
無線傳感網絡%貝葉斯估計%最小二乘%最大似然估計%最小均方誤差%迭代最小二乘
무선전감망락%패협사고계%최소이승%최대사연고계%최소균방오차%질대최소이승
wireless sensor network%Bayesian estimation%least squares%maximum likelihood%minimum mean square error iterative least square
针对基于接收信号强度(received signal strength ,RSS)测距定位框架,提出基于贝叶斯测距和迭代最小二乘定位的RSS的定位算法。在测距阶段,先利用贝叶斯概率模型处理测距过程,并采用最小均方误差(minimum mean square error ,MMSE)估计距离;在定位阶段,利用迭代最小二乘(iterative least square ,ILS)估计节点的位置,最后重点对其定位性能做了理论分析和对比实验。仿真结果表明,提出的MMSE+ ILS定位的方案极大地提高了定位精度,并降低了计算复杂度,但运行时间略有提高。
針對基于接收信號彊度(received signal strength ,RSS)測距定位框架,提齣基于貝葉斯測距和迭代最小二乘定位的RSS的定位算法。在測距階段,先利用貝葉斯概率模型處理測距過程,併採用最小均方誤差(minimum mean square error ,MMSE)估計距離;在定位階段,利用迭代最小二乘(iterative least square ,ILS)估計節點的位置,最後重點對其定位性能做瞭理論分析和對比實驗。倣真結果錶明,提齣的MMSE+ ILS定位的方案極大地提高瞭定位精度,併降低瞭計算複雜度,但運行時間略有提高。
침대기우접수신호강도(received signal strength ,RSS)측거정위광가,제출기우패협사측거화질대최소이승정위적RSS적정위산법。재측거계단,선이용패협사개솔모형처리측거과정,병채용최소균방오차(minimum mean square error ,MMSE)고계거리;재정위계단,이용질대최소이승(iterative least square ,ILS)고계절점적위치,최후중점대기정위성능주료이론분석화대비실험。방진결과표명,제출적MMSE+ ILS정위적방안겁대지제고료정위정도,병강저료계산복잡도,단운행시간략유제고。
In the framework of range‐based localization from RSS (received signal strength) measurements , the Bayesian Ranging and Iterative Least Squares (ILS ) positioning is proposed in this paper .In ranging phase ,ranging is considered as a Bayesian estimation problem ,and the distance is estimated by MMSE (minimum mean square error ) .In positioning phase ,,ILS is used to update the estimated of unknow n po‐sition .Numerical results show that the proposed algorithm improves considerably the accuracy of localiza‐tion ,and reduces computational complexity ,but increases computation time .