基于 RSSI值跳数修正和跳距加权处理的DV-HOP算法

摘要

针对传统DV-Hop定位算法在计算节点间的跳数和平均跳距存在的误差,提出了一种基于RSSI值跳数修正和跳距加权修正的DV-HOP算法. 首先,采取节点RSSI比值修正跳数;然后选择距离未知节点最近的3个锚节点, 并利用修正后的跳数求加权系数对平均跳距进行加权修正. 仿真结果表明:在相同的网络环境下,该算法没有增加其他硬件开销,并且定位误差相对于传统DV-Hop算法有一定减少.%To reduce the errors in calculating the hop count and average hop distance between nodes by the traditional DV-Hop localization algorithm, this paper presents a DV-HOP algorithm based on the ratio between node RSSI and the critical RSSI hop count correction and hop distance weighted revaluation. Firstly, the correction hops are attained by taking the ratio between node RSSI and the critical RSSI corrected hops; then three nearest anchor nodes to the unknown node are chosen, and the average hop distance is corrected by using the weighting coefficient, which is attained through the corrected hop count. The simulation results show that in the same network environment, compared with the traditional DV-Hop algorithm, the proposed algorithm requires only node communication chips with RSSI indicator, without additional hardware expenses, thus effectively reducing the location error.