摘要
无线通信中的非视距误差是影响传统定位算法精度的主要因素。因此本文针对存在锚节点与移动节点的无线传感网络,提出了一种利用拉格朗日乘子法改进的约束最小二乘定位算法。算法核心思路在于运用拉格朗日乘子法修正约束最小二乘代价函数来构建新的目标函数,同时也提出一种分组定位组合的思想以进一步提高定位性能。仿真结果表明在非视距误差较大或网络中固定节点较多时,提出的算法可以有效消除非视距误差引起的定位精度损失,同时本文算法还具有随节点数目增加而提升优势的特性。
The non-line-of-sight(NLOS) error in wireless communication significantly reduces the accuracy of positioning algorithm. Therefore,by considering the wireless sensor network including both the static node(SN) and the mobile node(MN),this paper proposes a localization algorithm using both the Constraint Least Square(CLS) and Lagrange multiplier,where the NLOS error corrupted localization is modeled as an optimization problem with the novel cost function. Moreover,a grouping operation is proposed to further improve the localization performance. The simulations demonstrate that the proposed algorithm can effectively reduce the positioning accuracy loss for scenarios with large NLOS errors or SN numbers. Furthermore,the proposed method works better with the increasing of the number of SNs.
作者
李溯南
华惊宇
王东明
周凯
陈芳妮
余旭涛
LI Su ’ nan 1,HUA Jingyu 1* ,WANG Dongming 2,ZHOU Kai 1,Chen Fangni 1,YU Xutao 2(1.Zhejiang Provincial Key Lab of Opt Commun Tech,Zhejiang University of Technology,Hangzhou 310023,China;2.National Mobile Communication Research Laboratory,Southeast University,Nanjing 210096,Chin)
出处
《传感技术学报》
CAS
CSCD
北大核心
2018年第8期1235-1239,共5页
Chinese Journal of Sensors and Actuators
基金
国家自然科学基金课题项目(61471322)
关键词
无线定位
拉格朗日乘子
最优化理论
非视距误差
无线传感网络
wireless localization
Lagrange multiplier
optimization theory
non-line-of-sight error
wireless sensor network