无线传感器网络中导标节点共线的解决策略

A Strategy for Collinear Beacon Nodes in Wireless Sensor Networks

节点的位置信息在无线传感器网络的很多应用中扮演重要的角色。已经提出的基于测距的定位算法几乎都用到了三角测量原理,但当所参考的导标节点共线或接近共线时,较小的测距误差都会带来很大的定位误差。针对这种情况,本文引入共线度概念,只有当所参考的导标节点的共线度大于某阈值时才进行位置估计。仿真结果表明,共线度的引入对减小定位误差有明显效果。

In many wireless sensor network applications, the physical locations play an important role. Triangulation is utilized in most range-based localization algorithms. When the referenced beacon nodes are collinear or almost collinear, however, an evident localization error would be brought out even if the range measurement error is small.As for this condition, the concept of collinearity is introduced. The location estimation executes only if the collinearity of the referenced beacon nodes is larger than a threshold. The simulation results show that the improvement of the localization error is explicit.