基于锚节点间距离的改进RSSI测距方法

节点定位是无线传感网络的核心支撑技术之一。为提高接收信号强度指示(RSSI)法的定位精度、消除路径散逸指数,提出一种基于锚节点的模糊C-均值(FCM)校正算法。该算法利用FCM模型对非敏感区的RSSI数据进行处理,筛选出RSSI较优值,并将已知2个锚节点之间的距离与测量得到的RSSI值作为参考,校正被测RSSI值对应的距离,消除路径散逸指数。仿真结果表明,该算法比统计均值模型具有更好的估计精度。

An Improved RSSI Ranging Algorithm Based on Distance Between Anchor Nodes

The node localization is one of the core support technology based on RSSI （received signal strength indicator） of WSN （ wireless sensor network）. In the actual application environment, because of multi-path,diffraction, obstacles and other factors, RSSI in the positioning process will produce distance error . An improved FCM algorithm based on anchor nodes is brought up, mainly taking account of the measurement precision and eliminate path dispersion index. This algorithm uses FCM model to deal with the RSSI which is obtained in sensitive region and the first-class RSSI is screened out. In this algorithm, it uses the known distance and measured RSSI between anchor nodes to correct the distance by being measured RSSI value, and eliminates path dispersion index. Simulation results show that this algorithm has a better estimation accuracy than classical RSSI algorithm.