Institute of Microelectronics, Tsinghua University, Beijing 100084, China.
Sensors (Basel). 2019 Sep 14;19(18):3983. doi: 10.3390/s19183983.
Wi-Fi-based indoor position sensing solutions have the advantages of easy integration in mobile phones and low cost by using existing Wi-Fi access points. The mainstream methods are commonly based on the received signal strength indicator (RSSI), which suffers from multipath interference in complicated indoor environments. Through the in-depth analysis of the multipath interference, an RSSI-assisted time difference of arrival (TDoA) method is proposed for Wi-Fi-based indoor position sensing in this work. The key idea is to compensate for the multipath interference in the received signals based on the coarse estimation using RSSI and TDoA calculation. A prototype system has been implemented to validate the proposed method. Experimental results have demonstrated the effectiveness of the proposed method, especially for handling the multipath interference with small propagation delay difference. Experimental results show that the indoor position sensing system can achieve a 90th percentile error of 0.3 m. The proposed method can also achieve moderate computational complexity and moderate real-time performance compared to other methods.
基于 Wi-Fi 的室内定位感知解决方案具有易于集成到移动电话中以及利用现有 Wi-Fi 接入点降低成本的优点。主流方法通常基于接收信号强度指示器 (RSSI)，但在复杂的室内环境中会受到多径干扰的影响。通过对多径干扰的深入分析，本工作提出了一种基于 RSSI 辅助到达时间差 (TDoA) 的 Wi-Fi 室内定位感知方法。该方法的关键思想是基于 RSSI 进行粗略估计并进行 TDoA 计算，从而补偿接收信号中的多径干扰。已经实现了一个原型系统来验证所提出的方法。实验结果表明了所提出方法的有效性，特别是对于处理小传播延迟差的多径干扰。实验结果表明，室内定位感知系统可以实现 90%的位置误差为 0.3 米。与其他方法相比，所提出的方法还具有适中的计算复杂度和实时性能。
