基于智能估计的无线传感器网络定位算法

Intelligent Estimation Based Wireless Sensor Network Localization

节点定位是无线传感器网络的基本机制,位置数据是监测事件不可缺少的信息,传感器节点必须首先确定自身的位置。针对无线传感器网络的节点定位问题,提出了基于Free Search优化的智能定位算法,介绍了Free Search优化算法和智能估计的模型。该算法的基本思想是将参数估计问题转化为非线性函数的在线优化问题,利用Free Search获得未知节点坐标的最优估计。仿真结果证明,与最小二乘估计定位算法相比,新算法定位精度显著提高。

The mechanism of the localization is the most fundamental mechanism in wireless sensor network. The information of location is indispensable for events-monitoring. In order to precisely locate the event, sensor nodes have to locate itself firstly. A novel intelligent estimation algorithm based on Free Search for nodes location in Wireless Sensor Network has been proposed, which converts parameter estimation to on-line optimization of nonlinear function and estimates the coordinates of senor nodes using the Free Search optimization. Experimental simulations show that the proposed method can significantly increase the localization accuracy.