NLOS状态信息辅助协方差矩阵修正的无线网络定位方法  

Wireless Network Positioning Method with Covariance Matrix Correction Assisted by NLOS State Information

作　　者：闻建刚 岳洋洋 华惊宇 倪郑威 徐志江 余绪涛[3] WEN Jiangang;YUE Yangyang;HUA Jingyu;NI Zhengwei;XU Zhijiang;YU Xutao(School of Information and Electronic Engineering,Zhejiang Gongshang University,Hangzhou Zhejiang 310018,China;School of Automation,Zhejiang Institute of Mechanical&Electrical Engineering,Hangzhou Zhejiang 310059,China;National Mobile Communication Research Laboratory,Southeast University,Nanjing Jiangsu 210096,China)

机构地区：[1]浙江工商大学信息与电子工程学院,浙江杭州310018 [2]浙江机电职业技术学院自动化学院,浙江杭州310059 [3]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《传感技术学报》2022年第11期1561-1567,共7页Chinese Journal of Sensors and Actuators

基　　金：浙江省自然科学基金(LQ21F010008);浙江机电职业技术学院科教融合孵化课题(A-0271-21-204)。

摘　　要：非视距(NLOS)误差是影响无线定位精度的重要因素,其产生是由于实际环境的多变性,使其无法用一个准确的数学模型来表示。如何减小NLOS误差的影响是无线定位中需要解决的问题之一。针对该问题,提出一种新的定位方法,通过视距(LOS)节点检测来获取测距结果中的NLOS状态信息,并基于该状态信息,对用于双步加权最小二乘(TS-WLS)定位算法的协方差矩阵进行修正,修正后的算法能够根据NLOS状态信息实现对不同测距结果的重要性加权,从而减小NLOS误差的影响。仿真结果表明,与以往的定位算法相比,所提算法能够拓展复杂NLOS环境下的适用场景并提升定位精度。Non-line-of-sight(NLOS)error is a crucial factor that affects the accuracy of wireless positioning.It is produced due to the variability of the actual environment,so it cannot be expressed with an exact mathematical model.How to reduce the impact of NLOS error is one of the problems to be solved in wireless positioning.For this problem,a wireless network positioning method using line-of-sight(LOS)node detection to obtain NLOS state information from the ranging results is proposed.Then,based on the state information,the covariance matrix used in the two-step weighted least squares(TS-WLS)positioning algorithm is modified,and the revised algorithm can make importance weighting for different ranging results to reduce the influence of NLOS error.Simulation results show that,compared with previous localization algorithms,the proposed method can expand the applicable scenes in complex NLOS environments and improve the localization accuracy.

关 键 词：无线定位 非视距误差 加权最小二乘 协方差矩阵 

分 类 号：TN929.5[电子电信—通信与信息系统]