摘要
传统蜂窝网络系统虽支持基于到达时间差(TDOA)的定位方法,但是精度较差。第五代移动通信(5G)可在室内定位分配系统中提供准确的多个TDOA测量值,可显著提高室内定位能力。随着5G微基站的大规模普及,目标终端从基站一侧可选择的测量值也越多,按照传统方法直接进行解算,测速运算量大且无法剔除误差较大的观测值。本文提出一种定位基站最优组合方法,使用广度优先搜索(BFS)筛选出水平精度因子(HDOP)最小的定位基站组合,并考虑每个TDOA测量误差具有不同的方差,采用加权最小二乘算法估计在基站最优组合条件下目标终端的位置。通过仿真分析和试验验证,基于最小HDOP选站下的到达时间差定位算法在保证了定位准确度的前提下,单次定位解算速度提高了51.14%,显著提升了定位响应速度。
The traditional cellular network system supports the positioning method based on the time difference of arrival(TDOA),but the precision is poor.The 5th-generation mobile communication(5G)can provide accurate multiple TDOA measurement values in the indoor positioning distribution system,which can improve the indoor positioning capability significantly.With the large-scale popularization of 5G micro base stations,the target terminal can select more measurement values from the base stations,then the calculation of speed measurement is much larger and the observation values with big errors cannot be eliminated while used the traditional method for the calculation directly.This study proposes a method of optimal combination for positioning base stations,which used the breadth-first search(BFS)to filter out the minimum HDOP(horizontal dilution of precision)of the positioning base station combination,and it also considered the different variance of each TDOA measurement,then used the weighted least squares to estimate the location of the target terminal.The simulation analysis and experimental verification shown that the positioning algorithm based on the time difference of arrival with the minimum HDOP of station selection ensures the positioning accuracy,and it also increased the speed of single positioning solution by 51.14%,which significantly improves the speed of positioning response.
作者
王腾辉
武建锋
焦喜康
朱靖川
WANG Teng-hui;WU Jian-feng;JIAO Xi-kang;ZHU Jing-chuan(National Time Service Center,Chinese Academy of Sciences,Xi’an 710600,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 101048,China)
出处
《时间频率学报》
CSCD
2021年第3期183-196,共14页
Journal of Time and Frequency
基金
二代导航重大专项资助项目(ZFS19001D(03))。
关键词
到达时间差
第五代移动通信
水平精度因子
广度优先搜索
最小二乘
time difference of arrival
5G system
horizontal dilution of precision(HDOP)
breadth first search
least squares estimation
