摘要
多径传播能显著降低基于到达时间差(TDOA)的定位精度。文中介绍了一种使用波束指向圆极化天线(BSCPA)抑制室内多径传播的方法。BSCPA由一个波束开关网络、四个相同的六边形贴片单元及其馈电网络组成。通过控制波束开关网络中的射频(RF)开关的状态,可以分别激励四个指向圆极化波束以实现方位角全向覆盖。根据BSCPA的指向波束和圆极化,可以减轻由室内多径造成的定位误差。在面积为10.8 m×6.6 m、视距(LOS)、复杂多径的室内环境中,当测试信号为20MHz带宽的WLAN时,得到的2D定位平均误差为0.71 m。与传统的全向线性极化天线(OLPA)相比,BSCPA可以将定位精度提高52.5%。该改进表明,所提出的方法可以显著抑制基于TDOA的室内定位的多径传播。
Multipath propagation can significantly reduce the TDOA-based accuracy.In this paper,a beam steering circular polarization antenna(BSCPA)is used to mitigate indoor multipath propagation.The BSCPA consists of a beam switch network,four identical hexagon patch elements and their feeding networks.By controlling the states of a radio frequency(RF)switch in the beam switch network,four steering circular polarization beams can be excited separately for azimuth omnidirectional coverage.Depending on steering beams and circular polarization of the BSCPA,the positioning inaccuracy from indoor multipath propagation can be mitigated.In a line of sight(LOS),complex multipath indoor environment with the areas of 10.8 m×6.6 m,the 2 D positioning mean error obtained is 0.71 m with a 20 MHz bandwidth signal in WLAN.Compared with conventional omnidirectional linear polarization antenna(OLPA),the BSCPA can improve positioning accuracy by 52.5%.The improvement shows that the proposed method can significantly mitigate multipath propagation for TDOA-based indoor positioning.
作者
苏长江
李顺礼
殷晓星
赵洪新
SU Chang-jiang;LI Shun-li;YIN Xiao-xing;ZHAO Hong-xin(School of Information Science and Engineering,Southeast University,Nanjing 210096,China)
出处
《微波学报》
CSCD
北大核心
2019年第4期47-51,共5页
Journal of Microwaves
基金
国家自然科学基金(61771127,61427801,U1536123)
关键词
到达时间差
室内定位
多径传播
圆极化
波束指向天线
time difference of arriving(TDOA)
indoor positioning
multipath propagation
circular polarization
beam steering antenna
作者简介
苏长江,男,1990年生,博士生。主要研究方向:RF电路与系统,有源天线,宽带移相器,等。E-mail:cjsu1990@163.com
