A Blocked Beacon Discovering Scheme for Sensor localization
In sensor networks,sensor’s position information is very important.With more and more sensors being deployed,automatic sensor localization tends to be preferred.For the indoors sensor localization,accuracy and cost are two key issues.In order to improve the accuracy,using advanced equipments is one choice,but the cost increases dramatically as a result.Thus,people prefer to densely deploy the beacons instead.However,as the beacon should be placed accurately,deploying beacon itself becomes a very annoying job.Other methods used widely are statistics method and the triangle rule.However,statistics method can do the work only when most of the estimate errors are within the permitted range.Also triangle rule can only get rid of the outliers who conceive very large errors.For the localization algorism,line-of-sight between the nodes and a beacon is required to ensure the localization correctness.However,for the indoors environment,it is very hard to avoid all the beacons from being blocked,which will consequently make the distances overestimated.In this paper,a blocked beacon discovering scheme is proposed.With the blocked beacon discovering scheme,blocked beacons in a beacon grid may be found out and ruled out,thus the final result can be rectified and the accuracy can be improved.Our simulations show that it can do the work.The blocked beacon discovering scheme will be helpful in the real sensor localization for health monitoring of large structures,especially for the system that the beacons are sparsely deployed.
sensor network localization beacon
C.Wan A.Mita
Department of System Design Engineering,Keio University,3-14-1 Hiyoshi,Kohoku-ku,Yokohama 223-8522,Japan
国际会议
The World Forum on Smart Materials and Smart Structures Technology(SMSST07)(2007年世界智能材料与智能结构技术论坛)
重庆·南京
英文
2007-05-01（万方平台首次上网日期，不代表论文的发表时间）