【摘要】 大规模水下传感器网络覆盖范围广,监测深度大,基于静止信标的定位方法很难获得好的定位性能。提出一种基于移动信标的range-free定位方法,信标在上下移动过程中广播位置信息,节点利用信标信息的变化估计位置范围。移动信标增大了网络覆盖范围,降低了节点间通信距离。实验结果表明,该方法可以获得和多功率发射定位接近的定位精度,但系统代价更低,精度高于一般的range-free定位方法。更多还原

【Abstract】 There are lots of difficulties for large scale underwater sensor networks to achieve perfect localisation performance using the localising approach based on static beacons,since the networks cover a great deal of wide areas and inspect in big depth.In this paper the authors propose a new range-free localisation method based on mobile beacons.The beacons broadcast their position information when moving upwards and downwards,and the nodes estimate the range of positions by the variation of beacons’ information.The mobile beacons extend the coverage area of the networks while decrease the communication distances among the nodes.Experimental results show that the method can attain the localisation precision approximating that of the localisation method of multi-power transmission with lower system cost,and its precision is also higher than general range-free localisation methods.更多还原