基于RSSI跳数修正的DV-Hop改进算法

Improved DV-Hop Location Algorithm Based on Hop Correction

针对原始DV-Hop算法中跳数值不能反应出节点间实际距离大小而导致拓扑不规则网络中节点定位误差较大的问题,提出了一种基于接收信号强度指示RSSI(Rceived Sgnal Srength Idicator)的改进算法。首先根据直接邻居节点接收到的RSSI值对第1跳进行分级,细化跳数;同时把节点间的距离比值作为权值,并将其转化为相应RSSI的关系对跳数进行加权修正,使获得的跳数值更准确。仿真结果表明在相同的网络环境下,与传统算法相比改进算法在不增加额外硬件的前提下有效地提高了定位精度。

To solve the problem that the hop value in traditional DV-Hop algorithm can’t represent the real distance, an improved algorithm based on RSSI is proposed. First of all,the first hop is subdivided into several grades based on RSSI,then the rest hops are modified with the distance ratio of adjacent nodes which is transformed into the corresponding relationship of the RSSI. The simulation results show that the proposed algorithm in the paper possesses of the higher location precision than the traditional algorithm without extra hardware in the same network environment.