摘要
提出了一种基于测距的移动信标节点定位方法。该方法采用一个移动信标节点,信标的移动方式采用高斯马尔可夫模型,该移动模型基本能遍历整个传感区域,能使未知节点获得足够定位信息;定位机制采用加权质心与扩展卡尔曼滤波算法相结合,先用加权质心算法进行初精度定位,进而用扩展卡尔曼滤波方法进行精确定位。通过对信标移动时间、移动速度、虚拟信标点个数、迭代次数等定位参数分别进行仿真试验,实验结果表明在相同条件下该方法与最小二乘法(LSE)及加权最小二乘法(WLSE)相比,其定位精度高,健壮性好,可扩展性强。
A mobile beacon localization algorithm is proposed. The algorithm uses a mobile beacon The mobility method of the mobile beacon uses Gaussian Markov Model, so Sufficient localization information can be obtained for each unknown node. The algorithm combines weighted centroid method and Extended Kalman Filter. Firstly, weighted centroid method is used to get the initial estimated value, then the EKF is adopted to circulate and optimize. The simulation is carried according to different beacon number, itera- tire times, different moving time and different moving speed of the beacon. In addition, the comparison of the localization effectiveness among the Least Squares Estimation Algorithms (LSE), Weighted Least Squares Estimation Algorithms(WLSE) and the proposed algorithm shows that the proposed algorithm has high precision, low computing complexity and strong expanded ability.
出处
《传感技术学报》
CAS
CSCD
北大核心
2009年第1期121-125,共5页
Chinese Journal of Sensors and Actuators
作者简介
陈娟(1983-),女,中南大学硕士研究生,研究方向为无线传感器网络及其定位等,chenjuan.0203@yahoo.com.cn
李长庚(1970-),男,博士,中南大学物理科学与技术学院副教授,硕士生导师,研究领域为无线通信和无线传感器网络等。lcgeng@mail.csu.edu.cn