评估传感器网络节点位置的不确定性对于需要鲁棒性考虑的网络应用有着重要的意义.本文利用网络中的邻接信息构成以节点位置为变量的约束集,利用投影的方法计算节点的所有可能位置范围.使用简单直观的多边形给出近似结果,同时给出了一种分布式实现算法.在考虑节点位置不确定性的情况下,对目标事件进行定位.仿真结果表明传感器网络在定位目标的过程中同样能提高节点定位精度.
It is important to evaluate sensor node position uncertainty for robustness required applications. This paper uses proximity information to construct a constraint set whose decision variables are node position. The feasible area of sensor node position is then computed through a projection method. A distributed algorithm is given to approximate this irregular area with simple and expressive polygon. Target event could also be positioned with the consideration of node position uncertainty. Simulation results show that localizing target event brings position refinements to sensor nodes.