一种改进的DV-Hop无线传感器网络定位算法

摘要

针对传统DV-Hop无线传感器网络定位算法误差较大的缺点,将接收信号强度指示RSSI(received signal strength indicator)加入定位系统对原算法进行改进.通过RSSI测距技术计算信标节点邻居节点的距离;根据接收信号强度指示(RSSI)的比值修正节点间跳数;采用极大似然估计法对待定位节点坐标初步估计后再用加权质心算法进一步精确定位.仿真结果表明,该改进方法与传统DV-Hop算法相比定位精度有较大的提升.%Since greater errors of the traditional DV-Hop algorithm for localization in wireless sensor network ,RSSI( received signal strength indicator ) is introduced to improve positioning accuracy .The distance of neighbor nodes of beacon nodes is obtained according to the distance measurement based on RSSI;updating node hops by ratio of RSSI ,then maximum likelihood estimation is used to estimate the node positioning firstly ,a further precise positioning is obtained by the weighted centroid algorithm .Com-pared with the traditional DV-Hop algorithm positioning ,the experimental result shows that this improved method has more accu-racy.