基于RSSI差分修正的WSN定位算法

Distance Difference 3D Localization Algorithm Based on RSSI for Wireless Sensor Networks

为了减小接收信号强度(RSSI)测量误差对无线传感器网络(WSN)节点自身定位精度的影响,在对无线电传播路径损耗模型分析的基础上对RSSI算法进行改进,将差分法和质心法相结合,提出一种RSSI差分修正的定位算法。该算法采用相邻节点的RSSI值差分修正的方法来减小环境对RSSI值带来的长时间干扰问题的影响,从而降低了定位误差。仿真结果表明,本算法可以有效提高室内的三维定位精度。

To suppress the received signal strength indication（RSSI）errors to the positioning precision of the localized nodes in wireless sensor networks, a localization algorithm using the modified distance difference was proposed based on RSSI for WSN after radio path loss propagation models was analyzed. The distance difference correction localization algorithm was put forward through combining the difference method and the weighted centroid averaging method. The method of the modified distance difference between adjacent nodes was used to lower the impact of RSSI jamming problem brought by environment, and the positioning error. The results of simulations demonstrate that location errors are reduced after using the localization algorithm, and this location algorithm is effective to improve the indoor positioning accuracy of three-dimension.