使用地球磁场的室内定位系统的性能改进
Sheng-Cheng Yeh1, Hsien-Chieh Chiu2, Chih-Yang Kao1
1Department of Information and Telecommunication Engineering, Ming Chuan University, Taoyuan City 333, Taiwan.
Sensors (Basel, Switzerland)
|August 26, 2023
概括
这项研究通过结合Wi-Fi和地球磁场数据来增强室内定位,实现高精度. 这种新的方法显著减少了定位错误,在各种室内环境中提高了系统可靠性.
科学领域:
- 室内定位系统 室内定位系统
- 地磁主义 地磁主义
- 无线通信是一种无线通信.
背景情况:
- 传统的基于无线电波的室内定位系统 (如Wi-Fi,蓝牙) 由于人影和多路径效应而存在准确性问题.
- 现有的系统通常在百货公司,展览厅,车站和机场有限.
- 需要更强大,更准确的室内定位解决方案.
研究的目的:
- 通过整合地球磁场强度和Wi-Fi信号,开发一个高可用性室内定位系统.
- 与现有方法相比,提高室内定位的准确性和可靠性.
- 调查设备定向和数据库大小对定位准确性的影响.
主要方法:
- 利用Wi-Fi信号通过环境分区进行初始区域识别.
- 使用地球磁场 (东-西,北-南,垂直) 的信号模式比较来定位.
- 应用k-最近邻居 (KNN) 和指纹算法用于细粒度定位.
- 包含一个旋转矩阵来纠正设备定向错误.
主要成果:
- 在12个区域分区时,实现了0.57米的平均定位误差,比单区域分区改进了90%.
- 通过对30度斜率进行旋转矩阵校正,减少了68%的平均定位误差.
- 在离线阶段仅使用25%的北方方向数据,证明了平均定位误差为1.38m.
- 当将数据库要求减少50% (每2米的参考点) 时,获得了1.77米的平均定位误差.
结论:
- 结合Wi-Fi和磁场的方法在室内定位准确性和可用性方面取得了显著的改善.
- 该系统证明了对设备定向变化的稳定性.
- 优化分区,数据使用和数据库密度可以进一步提高性能和效率.
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