水下无线传感器网络的节点精确定位

以无线传感器网络(WSN)水下应用为背景,针对特定的环境要求,提出了一种可实现网络规模升级的分布式无锚点网络节点自定位机制。该定位算法通过距离误差估计和分布式坐标计算方法,有效地减少了由于测量距离误差所带来的坐标计算误差和节点坐标计算所带来的通信开销,有利于网络节点能量的合理使用和大规模的WSN布放。通过试验仿真计算,验证了该定位机制的合理性,为水下WSN应用提供了有力的技术支持。

Accurate Node Localization in Underwater Wireless Sensor Networks

Due to wireless sensor networks in the underwater environment where an infrastructure does not exist and GPS cannot be used, the paper propose a scalable and distributed GPS-free position protocol that is capable of node discovery and relative location. This algorithm makes each node estimate the distance to neighboring nodes that are within its transmission range with Time of Arrival (TOA) technology. It formulates a gradient descent method to minimize the distance-measurement error in nodes local positioning. It compares the performance of this algorithm against existing mechanisms in simulating experiments, and the results show that the proposed method is able to support the underwater deployment of large scale sensor networks efficiently and precisely.