无线传感网中定位算法研究

Research on Localization Algorithm of Wireless Sensor Network

为了利用无线传感器网络对物体实现更加精确的定位,通过对接收信号强度指示（RSSI：Received Signal Strength Indicator）定位算法进行仿真与性能分析,确定了算法的误差来源,讨论了未知节点的邻居锚节点密度对定位精度的影响。根据仿真和数据分析选取合适邻居节点的个数,进而采用了更加精细的算法即利用RSSI平均值选取最优值剔除失真数据,以提高定位的精确度。实验结果表明,在相同的环境下改进算法使定位误差由0~5 m减少到0~1 m,平均误差由1 m左右减少到0.1 m左右,提高了定位精度。

In order to take advantage of the wireless sensor network to achieve more objects, the aims is to study and improve RSSI （Received Signal Strength Indicator） According to the simulation and performance analysis on RSSI localization algorithm, the precise positioning of localization experiment algorithm. determined the source of algorithm＇s errors. The influence of the number of neighbor bencon nodes on the positioning accuracy is discussed, and the appropriate number is selected according to the simulation figures and the data. Used the average value of RSSI to select the optimal value and eliminate the distortion data. The experimental results show that in the improved algorithm the localization error is reduced from 0 - 5 m to 0 ~ 1 m, and the average error is reduced from 1 meters down to 0. 1 m in the same environment, improving the localization accuracy.