基于DV-HOP算法的提高定位精度研究

Study of improving location accuracy based on DV-HOP algorithm

无线传感器网络在目标追踪、环境监测到空间探索等方面得到广泛应用,其关键支撑技术之一是节点定位.以经典的DV-HOP算法为研究对象,为突破算法本身的计算应用条件限制,在使用最小二乘原理得到位置信息时,采用异方差消除原理,在参考节点位置信息存在明显误差时,提高未知节点的定位精度.仿真实验结果表明:与原算法相比,改进算法能够降低累积误差带来影响,定位精度明显提高.

Wireless sensor networks have been wildly used in target tracking,environmental monitoring and space exploration,etc.One of its key supporting technologies is node localization.The DV-HOP algorithm is taken as the research object.To break the algorithm＇s calculation application restrictions,the heteroscedasticity elimination principle is adopted when obtaining node location information through the Least Squares principle.This method is applied to remove distinct errors emerging when referring to the node location information and improve the positioning accuracy of unknown nodes.The simulation experiment results demonstrate that the improved algorithm can reduce the affects which the accumulation error brings about and improves the positioning accuracy compared with the original algorithm significantly.