无线传感器网络LQI测距定位算法及其误差研究

摘要

无线传感器定位算法对无线传感器的工程应用具有重要的意义.针对基于LQI测距的无线传感器网铬.研究了测距模型的建立并对比分析了最小二乘定位算法和质心定位算法,相关仿真研究结果表明:该两种定位算法的精度与测距误差的性质具有鲜明的规律性,当测距误差正向分布时,最小二乘定位比质心算法精度高;当测距误差正负双向分布时,质心算法比最小二乘定位精度高.最后,文中通过搭建的ZigBee硬件平台实验验证了仿真的结果.本文从测距误差模型入手对无线传感器定位算法进行研究,仿真结果与实验验证相一致,有利于WSN的推广应用.%Wireless sensor network location algorithm plays an important role in the engineering applications of WSN. This paper intensively studies the modeling of distance measurement and does a comparative analysis of least squares location algorithm and cen-troid location algorithm. Simulation results show that positioning accuracy of the two algorithms is obvious related to the distribution of ranging errors. When the distribution of ranging error is positive, least squares location algorithm is better and when the distribution of ranging error is positive and negative, centroid location algorithm is better. In the end, this paper tests simulation results by data from ZigBee hardware platform. Experimental studies are accordant with simulation results. The article makes careful analysis of WSN location algorithm from the models of ranging error distributions; it is helpful to promote the applications of WSN.