Timing-Based Mobile Sensor Localization in Wireless Sensor and Actor Networks
Timing-Based Mobile Sensor Localization in Wireless Sensor and Actor Networks
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DOI：
10.1007/s11036-010-0231-0
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发表时间：
2010-10-01
影响因子：
3.8
通讯作者：
Akan, Ozgur B.
中科院分区：
文献类型：
--
作者：
Shah, Ghalib A.;Akan, Ozgur B.
本文研究了无线传感器与执行器网络（WSAN）中的定位问题。在WSAN中，事件检测和跟踪的性能高度依赖于事件的确切位置信息，这些信息必须与事件特征一起沿着报告。有了传感器节点的精确位置信息，行动者能够在检测到的事件区域中更有效地执行动作。在这种情况下，传感器节点的准确定位是必不可少的相对于演员。特别地，当传感器节点以及锚节点（行动者）是移动的时，问题变得复杂得多。为了实现移动的传感器节点相对于参与者的定位，提出了一种基于时间的移动的传感器定位算法（TMSL）。在TMSL中，传感器节点通过使用RF信号的传播时间和速度来确定其与动作器的距离。为了确定从演员的距离，演员主动广播的间隔自适应定义的模式，根据传感器节点的移动性和所需的定位精度水平的参考信标。这些参考信标携带它们被发送的间隔号。然后，传感器节点使用间隔数来计算本地信标的开始时间，然后使用该开始时间来确定传播时间。TMSL既不要求也不假设传感器节点之间或与演员的任何时间同步。性能评估清楚地表明，TMSL是自适应速度的移动的传感器和演员节点，可以配置根据所需的定位精度，以避免开销提高由于高速度。
In this paper, localization problem in wireless sensor and actor networks (WSAN) is addressed. In WSAN, the performance of event detection and tracking highly depends on the exact location information of the events that must be reported along with the event features. Having precise location information of the sensor nodes, actors are able to execute actions more effectively in the region of detected events. In this context, the accurate localization of sensor nodes is essential with respect to the actors. Particularly, the problem becomes much more complicated when the sensor nodes as well as the anchor nodes (actors) are mobile. In order to localize the mobile sensor nodes relative to the actors, a novel Timing-based Mobile Sensor Localization (TMSL) algorithm is introduced. In TMSL, sensor nodes determine their distance from actors by using propagation time and speed of RF signal. In order to determine distance from the actors, actors actively broadcast reference beacons in a pattern of intervals adaptively defined according to the mobility of sensor nodes and the required level of localization accuracy. These reference beacons carry the interval numbers in which they were transmitted. The interval numbers are then used by the sensor nodes to calculate the start time of the beacons locally which is then used to determine the propagation time. TMSL does neither require nor assume any time synchronization among the sensor nodes or with the actors. Performance evaluations clearly show that TMSL is adaptive to velocity of mobile sensor and actor nodes and can be configured according to the required localization accuracy in order to avoid overhead raised due to high velocity.