基于RSSI测距和DV-HOP误差修正的WSN节点定位

Localization Algorism for Sensor Node Based on RSSI Ranging and DV-Hop Error Correcting

针对DV-Hop算法定位精度受节点分布均匀度影响较大的问题,设计了一种基于RSSI测距和DV-Hop误差修正的传感器节点定位算法;首先采用RSSI接收信号强度值实现对跳数加权,以更好地反应跳段之间的间距;然后通过RSSI对锚点之间的距离进行测距,通过引入平均每跳误差,改善原有的锚点跳距计算方法,使得修正后跳距误差较原有方法大为降低;仿真实验表明,文中方法在节点非均匀分布且不增加硬件设备前提下,大大提高了定位精度,与文献[8]和传统DV-Hop算法相比,其定位误差分别降低了37.8%和25.5%,具有很强的实用性。

Aiming at the DV--Hop algorism is sensitive to uneven distribution of sensor nodes in the monitor area, an improved localization algorism was defined based on RSSI ranging and DV--Hop error correcting. Firstly, the RSSI was used to get the weight hop count to better reflect the distance between the nodes, then the RSSI is used to range the distance between anchor nodes, through introducing the average error per hop, the method for calculating the hop size was improved, making the error of hop size deducing largely. The simulation experiment shows the method in this paper can largely improve the logalization accuracy under no need of adding network communication, and compared with the method in literature [8] and the traditional DV--Hop method, the localization error is deduced 37. 8% and 25.5% respectively, and it is applicable.