异步无线传感器网络定位算法研究

Research on Localization Algorithm for Asynchronous Wireless Sensor Networks

本文讨论了一种基于钟差补偿的异步无线传感器网络定位算法,网络中各个节点时钟是不同步的。在锚节点相对定位时利用锚节点钟差补偿信号飞行时间(TOF),减少钟差对锚节点相对定位的影响。标签定位时利用钟差的最小二乘估计补偿原始TDOA,实现标签的精确定位,解决了时间不同步造成的定位误差过大的问题。最后通过仿真验证了算法有效性。

This paper discusses a localization algorithm based on the clock offset compensantion for asynchronous Wireless Sensor Networks with the clock of each node is not synchronized. The clock offset between anchor may be used to compensate the time of flight of signal while the relative localization of anchors happens, the effect of clock offset on the relative localization can be reduced. The least square estimation of the clock offset is used to compensate the of the original TDOA of tag localization,the precise localization of the tag can be achieved. The problem of localization error due to time asynchronous of WSN can be solved. The effectiveness of the proposed algorithm can be demonstrated by simulations.