【摘要】 针对无线传感器网络节点定位时非直线传播误差的影响,提出一种基于信号单径到达时间和接收能量比的NLOS(Non-line of sight)估计算法。本算法以单径到达时间为基础,结合接收能量衰减状况,建立了基于信号传播路径损耗模型的NLOS估算式,并结合天线系统方向性的影响对估计结果进行必要的修正。实测数据表明:经NLOS校正后节点定位误差能控制在45 cm以内,可满足各种无线传感器网络的节点定位需要。更多还原

【Abstract】 An algorithm for estimating non-line of sight(NLOS) based on the ratio of the single-path arrival time to the received energy is presented to reduce effects on the non-line of sight error when a wireless sensor network has locating nodes.An NLOS formula based on the model of signal propagation path loss is constructed,and corrected in view of the antenna system′s directivity.The measured data show that the node location error reduces significantly within 45 cm after the nodes are modified by NLOS.The method can meet the location requirements for all kinds of wireless sensor networks.更多还原